Order Code RL30913
CRS Report for Congress
Received through the CRS Web
Pharmaceutical Research and Development:
A Description and Analysis of the Process
April 2, 2001
Senior Specialist in Science and Technology
Resources, Science, and Industry Division
Congressional Research Service ˜ The Library of Congress
Pharmaceutical Research and Development:
A Description and Analysis of the Process
A central element of the debate about inclusion of prescription drug benefits in
Medicare is the price of prescription drugs. A key issue in the debate concerns the
relationship between those prices and the pharmaceutical research and development
(R&D) costs. While this report will not analyze that relationship directly, it does
present a description and assessment of the pharmaceutical R&D (drug development)
process and the factors that affect costs. Such an analysis should be useful in
addressing questions about the cost of pharmaceutical R&D and the dependence of
prescription drug prices in the United States on those costs.
Pharmaceutical R&D (drug development) consists of several stages. It begins
with drug discovery followed by preclinical drug development where thousands of
candidate chemicals may be screened for attractive therapeutic, pharmacological, and
toxicity properties. Successful candidates — usually 5 or fewer from an original pool
that may total 10,000 — are then subjected to three stages of clinical trials testing the
drugs’ effectiveness and side effects. If a drug emerges from the trials showing a
significant therapeutic benefit, it is submitted to the Food and Drug Administration
for marketing approval. If approved, post-marketing surveillance ensues looking for
possible safety concerns that did not emerge in the earlier trials.
The entire drug development process typically takes nearly 15 years. The largest
share of that time is devoted to the three stages of clinical trials. Although there is no
firm figure for the cost of drug development, estimates have run as high as $500
million for the costs associated with a typical drug. While these costs cannot be
stated with any real precision, the true cost is still probably high, and the major share
of those costs is for clinical trials.
Recent advances in molecular biology making use of genetic data developed in
the human genome project offer the promise of significantly shortening both drug
development and clinical trial time, although it may be several years before these goals
are routinely realized. Any significant shortening of the development time could
reduce pharmaceutical R&D costs and, possibly, prescription drug prices. Another
factor in the cost equation is the contribution of basic biomedical research funded by
the National Institutes of Health. Such research is very important for drug
development, and benefits the pharmaceutical industry by reducing its R&D costs.
There are several issues about pharmaceutical R&D that Congress may decide
to monitor closely. Two, which are within the scope of this report, concern federal
biomedical R&D funding and clinical trial practices. With respect to the first, a
particular concern is the possibility of unnecessary overlap in research sponsored by
both NIH and the industry as the latter strives to incorporate more of the promise of
molecular biology into the pharmaceutical R&D process. With respect to clinical trial
practice, of specific concern are human subject protection and the potential for
conflict of interest on the part of academic researchers taking part in clinical trials.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Biological Basis of Disease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Basics of Pharmaceuticals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
The Research Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Drug Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preclinical Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Clinical Trials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Development Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
R&D Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Congressional Concerns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Drug Development Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Federal Biomedical R&D Funding . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Clinical Trial Practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
A Brief History of Pharmaceutical Research and Development . . . . . . . . . 27
List of Figures
Figure 1. Drug Development Time and Attrition Rate . . . . . . . . . . . . . . . . 13
Figure 2. R&D Cost Allocations by Stage - 1998 . . . . . . . . . . . . . . . . . . . . . 17
Pharmaceutical Research and Development:
A Description and Analysis of the Process
Perhaps the central issue in the debate about inclusion of prescription drug
benefits in Medicare has been whether such action would lead to some type of price
controls for these drugs.1 A key element of that debate is the relationship between
prescription drug prices and the research and development (R&D) activities of the
In 2000, the world-wide, research-based pharmaceutical industry spent an
estimated $26.4 billion on R&D including $22.4 billion in the United States.2 The
U.S. and world-wide totals were up by about $2.4 billion, or 10%, from 1999. For
2000, these R&D expenditures constituted an estimated 20% of the sales of these
companies. It is the contention of the industry that current prices are required if that
R&D is to continue at a level sufficient to develop drugs to attack many of the
diseases now afflicting humankind. Critics, however, argue that those prices are
higher than can be justified by R&D costs.
The purpose of this report is to help the reader understand the pharmaceutical
R&D process as part of the knowledge needed to evaluate the debate about drug
pricing. In addition, however, the pharmaceutical R&D process and future prospects
raise a number of issues on their own. This report provides a description of that
process and analyzes a number of those key issues. The steps of the research process
— drug discovery, preclinical testing, clinical trials, and post approval monitoring —
are described. In addition, various factors affecting the duration and costs of the
process are discussed, including the possible consequences of recent advances in
biomedical research. Finally, an analysis is presented of topics pertinent to the R&D
process that may be of interest to Congress.
Although the report discusses pharmaceutical R&D costs, it does not present an
analysis of the validity of various cost estimates. Those and other areas related to
For a discussion of these issues see Congressional Research Service, Medicare: Selected
Prescription Drug Proposals, by Jennifer O’Sullivan, RL30584, Updated September 14,
Pharmaceutical Research and Manufacturers of America, Pharmaceutical Industry Profile
– 2000 (PhRMA, Washington, DC, 2000), 20.
pharmaceuticals R&D and prescription drugs, including patent protection, regulation,
and advertising, are now or will be covered in other CRS studies.3
A description of the pharmaceutical R&D process requires a brief review of the
relevant biology, both to help the reader understand the origins of most human disease
and how most drugs work in combating diseases. The section begins with a brief
discussion of the basic biological mechanisms of living systems and how disease
attacks those systems. It next presents a short discussion of the biological processes
by which pharmaceuticals work in combating disease.
Biological Basis of Disease
Of the different chemical compounds that are essential for human organisms,
proteins play crucial roles in most human biological functions and provide much
structural support. Proteins provide structural support for the body as critical
components of ligaments, tendons, and skin. Enzymes are proteins that accelerate the
essential chemical reactions in the cell. Antibodies are proteins that protect cells from
attack by foreign substances called antigens. Hormones that regulate cell metabolism
are proteins. 4 Within the membrane (wall) of the cell, proteins act as receptors,
attaching to and transporting essential chemicals into the interior of the cell. Proteins
perform many other functions as well.
The instructions contained in the genetic code are translated to control of cellular
behavior through the synthesis of proteins. The genes contained in the DNA molecule
code instructions for the chains of amino acids which are the building blocks of
proteins. Furthermore, this gene expression is itself regulated by other proteins.
Proteins are large molecules, containing hundreds to thousands of atoms, and are
arranged in very complex shapes. For those proteins responsible for controlling
functions — enzymes, receptors, hormones, etc. — both the chemical structure and
the shape determine how they react with other chemicals.
Because proteins are so important to the functioning of living systems, they are
naturally almost always involved when something goes wrong. In most cases the
See for example, Congressional Research Service, Patent Law and Its Application to the
Pharmaceutical Industry: An Examination of the Drug Price Competition and Patent Term
Extension Act of 1984, by Wendy Schacht and (name redacted), RL30756, December 5,
1999; Congressional Research Service, Prescription Drugs: Factors Influencing their
Pricing, by David Cantor, 96-296, Updated Feb. 3, 1998; Congressional Research Service,
Food and Drug Administration Modernization Act of 1997, by Richard Rowberg, et. al., 98263, March 13, 1998; and Congressional Research Service, Food and Drug Administration:
Selected Funding and Policy Issues, by Donna Vogt, 95-422, Updated February 27, 2001.
Not all hormones are proteins. Another common class of hormones are steroids such as
testosterone, vitamin D, and cholesterol.
problems occur with proteins that are either enzymes, receptors, or hormones.5
Many cancers result when proteins that control the rate at which cells divide no longer
function properly, and cells begin to multiply in an uncontrolled manner. Infections
can damage a living organism when bacteria or viruses produce toxins that inhibit
protein synthesis, resulting in the death of cells. These microbes can also cause
damage by invading and multiplying within cells and tissues. Fever and inflamation
result through the action of the body’s immune system attacking the intruders. In the
case of AIDS, proteins on the human immunodeficiency virus (HIV) bind to receptor
proteins on cells of the immune system. The virus is then able to invade those cells,
reproduce, and eventually destroy the cells. As a result, the immune system weakens
and is unable to stop other microbial invasions called opportunistic infections.
Other diseases result from problems with hormone production or utilization.
Diabetes I occurs when the body does not produce the hormone insulin while diabetes
II occurs when insulin production is normal but the body cannot use it. In the
cardiovascular system, proteins called low density lipoprotein (LDL) deposit
cholesterol stored in fat cells on body tissue including the insides of blood vessels.
High density lipoprotein (HDL), on the other hand, carries the cholesterol to the liver
for recycling. Therefore, if the ratio of LDL to HDL is too high, the individual is at
risk for heart disease.
Identifying and understanding protein behavior, therefore, are primary objectives
of research into disease and its causes. Because of the connection between genes and
proteins, it is also clear that genes play an important role in disease mechanisms.
Indeed protein behavior that leads to disease can often be attributed to genetic
mutations that result in creation of proteins that do not behave normally or of failure
to create needed proteins. For example, cystic fibrosis results from a genetic mutation
that prevents the formation of proteins allowing chloride to pass through cell walls.
Over 4000 diseases have been identified as having a genetic origin,6 although many
of those are rare. Some are the result of single gene mutations while others result
from a combination of multiple gene mutations and other factors. Because of this
gene-protein linkage, genetics has been and continues to be the target of research in
understanding disease and its origins.
Basics of Pharmaceuticals
Given the role of proteins in disease it is natural that the focus of most drug
therapy is to inhibit protein activity that causes physiological harm to humans or to
stimulate protein activity that is needed by the body but is lacking.7 For example,
aspirin works for pain mitigation by inhibiting the action of a protein that, when
stimulated, is responsible for producing a chemical that results in pain. Aspirin
For a general discussion of the role of proteins in disease, see Susan Aldridge, Magic
Molecules: How Drugs Work (Cambridge: Cambridge University Press, 1998).
Eric S. Grace, Biotechnology Unzipped: Promises and Realities (Washington: Joseph Henry
Press, 1997), 62.
See Aldridge, Magic Molecules, 6-11, 73 and Jurgen Drews, In Quest of Tomorrow’s
Medicines (New York: Springer, 1998), 118-121.
contains chemicals that bind with that protein, preventing it from acting. As a
stimulant for protein activity, drugs can bind with receptors, causing the cells on
which they are located to carry out desired biochemical activity. For example, when
insulin binds with its target receptor, the cells act to maintain steady levels of glucose
in the blood stream. Many cancer drugs work by actions that inhibit proteins
responsible for maintaining multiplication of cancerous cells, resulting in the death of
those cells (as well as other rapidly dividing cells). Antibiotics kill bacteria by
inactivating enzymes on bacterial cell membranes, causing them to stop forming, or
by halting the synthesis of proteins needed to sustain the microbe’s life.
While the basis of most pharmaceutical action sounds straightforward,
implementing such action is usually very difficult. Determining targets for drugs can
be a daunting, costly task as has been repeatedly demonstrated from the history of
biomedical research. For example, the research effort to discover the proteins
responsible for cancerous cell growth and how they work has consumed many billions
of dollars and several decades, and complete understanding still appears a long way
off. Furthermore, once a target is determined, discovering a chemical that will bind
with that target protein and either inhibit or aid its actions as need be is not assured.8
As stated above, proteins have very complex shapes that determine how other
molecules bind with them, and even if one can discover such molecules, the drug still
may not work in humans. Human biological processes on the molecular level are
extremely complicated and research efforts to understand those processes and bring
about chemical therapies for disease are substantial.
Just how is that research carried out? How are the fundamentals outlined above
applied to bring about the development of prescription drugs? The next section
provides a description of the pharmaceutical R&D process as it is typically performed.
Reference is made wherever appropriate to the biological basis of disease and
pharmaceuticals just presented.
The Research Process
This section discusses the pharmaceutical research process. The section begins
with a brief overview of the entire process. It then describes in more detail the basic
research phase of pharmaceutical research, drug discovery, followed by a discussion
of preclinical research. A description of the clinical trial phase is given next followed
by a review of the post-approval process. A brief survey of the history of
pharmaceutical R&D is given in Appendix A.
Drug research and development begins with the drug discovery phase. Typically,
at this stage, chemical compounds — either naturally occurring (called biologics) or
synthetic — are investigated in laboratory settings for their potential to bind to and
In the case of aspirin and penicillin, the biological basis of the drugs’ actions were
not discovered until many years after the drugs themselves were discovered.
modify target molecules. Once promising candidates are identified, preclinical testing
begins. In this stage, actual drug development begins and pharmacological studies
are carried out. Basically that research focuses on how the drug candidates react
when delivered to the body.
If promising candidates emerge from these first two stages, they enter the most
arduous and time-consuming portion of the R&D process, clinical trials. There are
three stages to clinical trials — called phase I, phase II, and phase III — that a
candidate drug must pass through before it can be considered for market approval.
In phase I, the safety of the candidate drug is tested on healthy volunteers. Once
safety screening is complete, testing begins on a population of patients who have the
disease. Then, phase II trials are held to establish the parameters (end points) for the
quantitative measurement of the effectiveness of the drug. Phase III trials are
basically a large-scale version of phase II trials. In phase III, however, the focus is
on obtaining quantitative measurements of the effectiveness of the drug, based on the
end points determined in the phase II trials, and on monitoring for any important side
If the results of the phase III trials provide a clear indication of the candidate
drug’s effectiveness and that any side effects can be reasonably managed, it is
submitted to the Food and Drug Administration for approval to market. During that
process, it is possible that FDA may require additional phase III trials. If approval is
granted, post-marketing surveillance is carried out to monitor the drug for additional
safety concerns that may not have appeared during the preapproval clinical trials.
Additional trials — phase IV — may also be required at this point.
Each of these steps is complex and uncertain, and each requires a substantial
commitment of time and resources. To gain some insight into those characteristics,
each step will now be described in more detail.
Drug discovery usually begins with research to identify potential drug targets.
Targets are biochemical compounds in the body — usually proteins, as noted above
— whose action or absence of actions results in a diseased condition.9 In some cases,
drugs have been discovered without researchers knowing an underlying cause of the
disease. Aspirin was discovered long before the mechanism by which it works was
determined. Much more often, however, particularly in recent years, identification of
drug targets has launched the search for therapies. Usually the search is aided by new
knowledge of biological processes and disease mechanisms resulting from basic
Most illness and death from illness is a result of viral or bacterial infection. Proteins are still
the target of antibiotic and antiviral drugs. although they belong to the invading microbes and
not the host. Blocking bacterial enzymes or inhibiting protein synthesis are the principal
objectives of antibiotics. Drugs that work with viruses usually bind on viral enzymes,
inhibiting their action. Vaccines against infectious diseases work by presenting an antigen to
the host’s immune system. Antigen proteins, carried on the surface of a virus, stimulate the
immune system when a virus enters (Aldridge, Magic Molecules,72-82).
biomedical research, much of which is funded by the National Institutes of Health
Diseases often have multiple biochemical causes or factors. Discovery of a
single factor in such a case may not lead to a useful drug target. As noted above, the
complexity of most diseases means that identification of targets is generally quite
difficult. It is estimated that thousands of potential targets exist in the body. 10 By
1996, however, a survey of drug targets on which current drug therapy was based
found that only about 500 targets were being used, 45% of which were receptors and
28% of which were enzymes.11 The remaining 27% consist of a variety of targets
including hormones, DNA molecules, and cell nuclei receptors, or are unknown.
The actual process of drug discovery is characterized by a search for molecules
that can bind to targets and result in an action that produces a therapeutic result.
Until the last few decades, this search was largely a trial and error process.12
Pharmaceutical companies would develop libraries of thousands of molecules over the
years from a variety of sources.13 When a promising target was identified, researchers
would test molecules from these libraries, largely by trial and error or random
screening, to look for potential therapeutic activity. Many different natural and
synthetic compounds — thousands to tens of thousands — were tried in laboratory
experiments, often using animals, to see whether they showed therapeutic promise.
Often, the biochemical basis for any therapeutic effect was not understood, and at
times a substance being screened would be found to treat an ailment different from the
one for which the screening was intended.14 In addition to being time-consuming and
resource intensive, discoveries obtained in this fashion usually did not yield findings
that could be generalized to aid in the search for therapies to other diseases.
Consequently, while this method of drug discovery has resulted in many new drugs
over the years, the industry has put major efforts into development of more rational
In recent years search methods have become more systematic.15 Using a
technique known as combinational chemistry, literally thousands of candidate drug
compounds can be produced in a systematic and automatic fashion. In this situation,
a candidate molecule is modified, atom-by-atom, producing a large number of similar
molecules to be tested for therapeutic action. Testing itself is done using automated
Aldridge, Magic Molecules, 257.
Jurgen Drews, “Drug Discovery: A Historical Perspective,” Science 287 (2000), 1961.
Drews, In Quest of Tomorrow’s Medicine, 121.
While most of these molecules are produced synthetically, a large fraction of prescription
drugs on the market comes from natural sources. Of the 520 drugs approved between 1983
and 1994, 39% were either natural products or derivatives of natural products (Alan Harvey,
“Strategies for discovering drugs from previously unexplored natural products,” Drug
Discovery Today, 5 (July 2000), 294).
National Research Council, “U.S. Industry in 2000: Studies in Competitive Performance,”
Pharmaceuticals and Biotechnology, (National Academy Press, Washington, DC, 1999) 368.
Drews, “Drug Discovery: A Historical Perspective,” 1962.
methods including monitoring the interactions using a high-throughput screening
process. Results which modify the targets are explored further giving rise to more
information about those compounds. The use of combinational chemistry expanded
rapidly in the 1990s, and a huge library of potential drugs exists in those companies
employing this technique.16
Advances in molecular biology (see box) are also having a profound effect on
drug discovery. First, they are leading to a substantial increase in understanding the
origin and causes of diseases. Application of molecular biology developments is
changing the way researchers identify drug targets. More about this application will
be discussed below. Second, biotechnology (see box) has been used to bring about
dramatic increases in the production of certain drugs (e.g., insulin) whose efficacy
was already established. Third, new results from molecular biology research are being
used to enhance the search for other drugs.17 As a research tool, genetic engineering
(see box) is used to produce “pure” screens on which to test new drug candidates.18
Therefore, rather than relying on a screen that may contain the target in question
among others, the receptor can be synthesized and made to exist alone, allowing a
more rational and effective test of the drug.19 Recent developments in biotechnology
are only just beginning to make major contributions to drug discovery, however, and
they promise to revolutionize the entire pharmaceutical R&D process.
Molecular Biology – The study of the properties and functions of living organisms
at the molecular level. The objective is to understand the behavior of the
molecules that make up an organism’s cells and the interactions between those
molecules. The principal foci of molecular biology research are the molecular
structure of genes — in particular the DNA molecule — and the structure and
behavior of protein molecules.
Biotechnology – The technique of using living cells to make useful products and
provide services. Modern biotechnology involves the manipulation of the
molecules making up cells, such as DNA and RNA.
Genetic Engineering – A type of biotechnology that involves manipulation of
genetic material to produce desired types of living organisms or to correct genetic
Once promising drug candidates have been identified, they enter the preclinical
research stage. The candidates undergo laboratory and animal testing focusing on the
Robert Service, “Winning combination,” Technology Review, 101 (1998), 34-42.
National Research Council, “U.S. Industry in 2000: Studies in Competitive Performance,”
Screens are small samples of chemical or biological substances that contain drug target
molecules. They are used for initial testing of drug candidates to look for those candidates
that will bind with the target.
National Research Council, “U.S. Industry in 2000,” 381.
pharmacological aspects of drug development. Of the about 5,000 to 10,000 drug
candidates screened during the drug discovery stage, about 250 will typically make
it to the preclinical research stage.20 During this phase, the pharmacological concerns
of toxicity, bioavailability,21 and efficacy are investigated. In addition, at this point,
an investigational new drug (IND) application is filed with the Food and Drug
Administration (FDA), patents are applied for, and efforts are started to develop
economic and quality manufacturing processes.22 Safety testing takes place in animals
that are administered ever increasing doses to look for onset of toxicity. Also, a key
feature of this stage is to determine the best method of delivery (e.g., oral,
intravenous, etc.). A drug with a low bioavailability — at or near zero — either must
have its dosage increased when administered orally or it must be administered in some
other way. Other tests include determining a drug candidate’s shelf lifetime and
The first step in preclinical pharmacological testing is to determine toxicity,
including the relationship between dosage and toxicity, how those effects vary over
time, the organs affected, and the reversibility of any effects.23 To determine how the
effects change over time or whether there are long-term toxic effects, extended tests
are performed. They usually last more than a year and attempt to determine a number
of factors in addition to a cataloging of any risks of long-term use. Included are tests
to determine dosage range, maximum dosage for no side effects, and largest tolerable
dosage. In parallel, carcinogenicity studies, involving various dosage levels and
lasting up to two years, are carried out. Other conditions studied include local side
effects, allergenic reactions, and effects on reproduction.
During the safety testing, animals are used for studies of toxicity including
chronic toxicity.24 The drug’s cancer-causing potential is also investigated by
examining how it may damage the animal’s DNA. Pregnant animals are used to look
at the drug’s effects on pregnancy. Animal testing is opposed by some, however, and
other methods are being sought, including the use of tissue cultures, bacteria cells, and
computer models. Many of these methods are now used for preliminary screening to
reduce the number of animals used in safety testing.
Drug delivery is also an important objective of preclinical research. This stage
involves the study of how the drug is absorbed, distributed, metabolized, and excreted
by the body. Such studies are carried out on animals. In order to maximize the
Pharmaceutical Industry Profile – 2000, 32.
Bioavailability is a measure of drug’s ability to move through and remain in the human body
and reach the bloodstream and the drug target with a sufficient dose for therapeutic action.
For a drug taken by mouth, a high bioavailability — at or near one — means that it was not
metabolized by the liver and that it penetrated the walls of the small intestine to the blood
stream before being excreted (Aldridge, Magic Molecules,11-12).
An investigational new drug (IND) is a drug candidate undergoing clinical investigation or
an approved drug being investigated for a new indication (use). FDA may permit an IND to
be used for seriously ill patients who are not part of ongoing clinical trials.
Drews, In Quest of Tomorrow’s Medicine, 129-130.
Aldridge, Magic Molecules, 43-44.
amount of the drug that reaches the drug target, it is necessary to develop delivery
systems that minimize the absorption of the drug by healthy tissue before it can reach
the target.25 For example, many drugs that are proteins would be digested rapidly by
the stomach and small intestine. Enzymes in the liver can deactivate many drugs if
they circulate in the blood stream. If, as a result of such actions, a drug candidate
will not work if taken orally, the major alternative at present is needle injection.
Because injections cause discomfort and can be difficult to administer, much
pharmaceutical R&D is directed at ways to deliver drugs to avoid needle injections.
The dosage level of drugs must also be controlled so that they are effective but not
toxic. In addition, timing of drug delivery may be important because of disease
rhythms and natural body cycles, and to minimize toxic effects.
The final objective of preclinical research is the development of manufacturing
methods.26 Most often production is done by synthetic chemistry, but the use of
genetic engineering (recombinant DNA) is growing. Other methods include
fermentation27 and extraction from natural sources (primarily plants). Once a method
is chosen, production is scaled up to levels needed for clinical trials.
Of the approximately 250 drug candidates that enter the preclinical research
stage for a typical drug development project, about five will emerge as INDs to be
tested in the clinical trial stage. Clinical trials, which constitute the most timeconsuming and costly portion of drug development, consist of three phases, each
more complex than the preceding. Before clinical trials can begin, the sponsoring
pharmaceutical company must have approval from FDA about trial protocols (see
Description. Phase I clinical trials are designed to test drug safety; in particular
to determine maximum safe dose. Small, single doses are used at first, with the
dosage level increasing until side effects are observed. Concentrations of the drug in
the blood are then measured. These tests are followed with multiple dose tests, and
a range of concentrations that do not produce unacceptable side effects is determined.
Typically, a phase I trial will include 10 to 100 participants, last about 1.5 years and
cost about $10 million.28 Participants are usually healthy, although if very serious side
effects are a possibility, the tests may be made on the targeted patient group.
The purpose of phase II trials is to determine the parameters for the final test
(phase III trials). These parameters, among others, are the class (e.g., age, gender)
National Institute of General Medical Sciences, National Institutes of Health, Medicines
by Design: The Biological Revolution in Pharmacology, NIH Report No. 93-474, September
1993, 29-30 [http://www.nigms.nih.gov/news/science_ed/medbydes.html]
Aldridge, Magic Molecules, 41-42.
Fermentation — a biotechnology process — is used to produce vast quantities of certain
bacteria that, in turn, are used to produce many antibiotics and other drugs such as insulin.
Justin A. Zivan, “Understanding Clinical Trials,” Scientific American, 282 (April 2000),
and condition of the patients to include in the trial, what end points to measure, and
what constitutes an effective dose and duration of treatment. End points are those
conditions that yield an unambiguous indication of the drug’s success or failure. To
test a drug’s effectiveness often it is necessary to look for surrogate markers rather
than, survival, absence of the disease, or some other measure of long-term success.29
For example, in AIDS, testing for a period long enough to determine whether there
is a high long-term survival rate would not be appropriate because of the large number
of years it would take. Such a trial be impractical. In this case, a surrogate, such as
a decline in viral particles in the blood, may be considered an acceptable marker.
Similarly, markers are used for chronic diseases such as diabetes because of the length
of time needed to prove that the drug actually inhibits the onset of complications.
There is a risk of using surrogate markers, however, because they may not
adequately predict the therapeutic effectiveness (clinical benefit) of the drug
candidate. In such a case, a trial could show significant positive results based on the
surrogate chosen, and the drug would be approved. When used by the general patient
population, however, it is possible that drug may not improve the patients’ well-being
to any significant degree. For this reason, for any drug that uses surrogate endpoints
to gain market approval, the FDA will require a clinical trial after that approval to
“resolve remaining uncertainty” about the ability of the surrogate endpoint to
accurately predict clear clinical benefit.30
Phase II involves the first use of a control group — a test group of patients to
whom a placebo or another drug is given — which allows the clearest means of
proving whether the drug is successful and of determining its side effects. The use of
placebos is becoming less common in favor of existing treatments where possible.
Control groups also provide the means of eliminating confounding factors (factors
that may have the same effect as the drug being tested but are unrelated to the drug’s
actions). A drug effect — desired or otherwise — must show up in a statistically
significant manner among the participants of the test group in order to be considered
definitive.31 Use of a control group should be a double-blind procedure: neither the
patients nor the physicians administering the treatment should know which group is
getting the therapy being investigated. Typically, phase II trials include 50 to 500
participants, last about two years, and cost about $20 million.32
Phase III trials determine the effectiveness of the drug and any important side
effects. The testing in this phase is designed to match as closely as possible how the
drug would be used if marketed. Often, several controlled studies (studies using
control groups) take place at different locations (called multi-center studies), and each
study must follow the same protocols. The group of patients included in the test are
selected based on characteristics defined in the phase II trials. An important factor
for this phase is to get patients with just the right level of illness to test efficacy —
patients too ill may not live through the trial and those not ill enough may not show
Drews, In Quest of Tomorrow’s Medicine, 132.
21 CFR 314.510
Zivan, “Understanding Clinical Trials,” 73.
significant improvement.33 While such a group is not strictly representative of the
entire population of patients with that disease, it is a necessary compromise in order
to ensure a feasible trial.
The goal of the phase III trial is authoritative demonstration of a drug’s
effectiveness as defined by the end points determined in the phase II trials. A control
group is used and a statistically significant number of test group patients must attain
those end points for the study to be considered pivotal. Usually two or more pivotal
trials are required to secure FDA approval unless the first trial is particularly positive.
A large fraction (about 80%) of the data used for FDA approval applications arises
from phase III trials.34 If the results of the first phase III trial are ambiguous, a
redesigned trial is usually held with a more restricted group of patients or with other
changed factors. The data from the first trial usually determines the changes, if any,
that need to be made in the follow-up trial.
The ideal Phase III trial is a double-blind, crossover trial. Crossover means that
the test and control groups switch half-way through the trial. If the tested drug
produces dramatic improvements, trials may be stopped before scheduled completion,
with the approval of FDA, to make the drug available to everyone suffering from the
disease. Phase III trials typically involve anywhere from 300 to 30,000 participants,
run for three to five years, and cost about $45 million.35
General Features. During the clinical trials, companies are required to follow
certain standards and procedures to ensure good clinical practice.36 As part of the
IND filed with the FDA, the company must provide a complete description of the
procedures it will follow in the clinical trials, including how it will meet the standards
of good clinical practice. The FDA must approve those procedures before trials begin.
The FDA issues guidelines about trial procedures, but they do not have the force of
law. The FDA also has oversight responsibility over the trials and has the right to stop
them at any time if it believes the participants may be at excessive risk.
The FDA also requires two other conditions to be met before trials can begin:
informed consent by the participants and the establishment of an Institutional Review
Board (IRB).37 Patients participating in trials must sign a written, informed consent
form explaining — to the extent possible — all of the potential risks about the study.
The IRB, made up of patients’ advocates, health-care professionals, and
nonprofessionals, must oversee the trial, permit it to begin, and stop the trial if
necessary. A Data Safety Monitoring Board is also established to monitor safety and
other aspects. It, too, can recommend stopping the trial before it is completed.
Aldridge, Magic Molecules, 48.
Drews, In Quest of Tomorrow’s Medicine, 134.
Zivan, “Understanding Clinical Trials,” 75.
U.S. Food and Drug Administration, Center for Drug Evaluation and Research, From Test
Tube to Patient: Improving Health through Human Drugs, DHHS (FDA) 99-3168,
September 1999, 25.
Costs of clinical trials, as noted above for each of the phases, are substantial and
are usually borne by the drug companies. The costs include organizing and running
the trials (done by physicians), data verification, analysis, and support personnel, as
well as payments to physicians and nurses caring for participants. They do not include
the cost of capital which, as noted below, is usually included when calculating total
pharmaceutical R&D costs and is substantial. Because of the cost of these trials,
pharmaceutical companies will almost always limit the drugs tested to those that have
the potential for large markets.38
Upon completion of phase III trials, if the results prove positive, a New Drug
Approval application (NDA) is filed with the Food and Drug Administration
requesting approval to market the drug.39 This application must contain a description
of the drug chemistry, manufacturing processes, labeling (instructions for use of the
drug), preclinical pharmacology and toxicology, pharmacokinetics (drug action in the
body) and bioavailability in humans, and data and analysis from the clinical trials.
Supporting information includes a description of clinical safety, patient information,
and other relevant information. These applications are quite extensive, ranging up to
several tens-of-thousands of pages in length.40
If approval is granted, the drug can be marketed. Assessment of the drug,
however, does not stop at that point. Even though phase III trials consist of a large
number of participants, it is impractical to make them so large that all conceivable
adverse reactions can be determined. Therefore, postmarket surveillance must be
carried out to determine if there are any safety concerns that did not show up during
the clinical trials. This activity usually does not use controlled studies as is the case
for phase II and phase III trials, but rather relies on observations of physicians
prescribing the drug. Pharmaceutical companies are required to file adverse drug
reaction (ADR) reports with the FDA on a regular basis. The marketing
pharmaceutical company usually recruits physicians to monitor the actions of the drug
on patients to whom it has been prescribed. On occasion, serious reactions show up
that result in the drug being removed from the market, such as was the case with the
diabetes drug Rezulin, which caused the deaths of several people taking the drug.41
It is also possible that FDA, as a condition of marketing approval, may require a firm
to carry out a study to obtain more safety information after the drug is on the market.
As noted above, such is the case for pre-approval trials that are based on surrogate
endpoints. If such a study involves a clinical trial, it is labeled as a phase IV trial.
It is also possible that new uses (indications) for the drug will be found during the
phase IV trials.
Drews, In Quest of Tomorrow’s Medicine, 135.
For a description of the FDA, see Congressional Research Service, Food and Drug
Administration: Selected Funding and Policy Issues for FY2000, by Donna Vogt, 95-422
SPR, February 27, 2000.
Drews, In Quest of Tomorrow’s Medicine, 137.
David Willman, “The Rise and Fall of the Killer Drug Rezulin,” Los Angeles Times, June
4, 2000, Section A1.
This section presents a discussion of three topics that are of particular
importance in any consideration of the pharmaceutical R&D process: the time
required to complete the process (drug development time), the cost of R&D to bring
a drug to market, and the allocation of costs among the various components of the
drug development cycle.
Development Time. As indicated above, the time it takes to go from the start
of the drug discovery phase to the successful marketing of a drug is typically several
Figure 1. Drug Development Time and Attrition Rate
5000 - 10000
Phase I Trials
Phase II Trials
Phase III Trials
approved by FDA
years. In addition, there is substantial attrition of drug candidates along the way.
Figure 1, adapted from the Pharmaceutical Research and Manufacturers of America
(PhRMA) 2000 Industry Profile, shows both of these characteristics.42 The figure
shows that the entire process takes on average about 15 years to marketing approval,
with the clinical trials phase taking up about 7 years or 47% of the time. Furthermore,
total drug development time has lengthened over the past 40 years.43 In the 1960s,
the average development time to approval from the onset of drug discovery (first
synthesis of a drug candidate for initial laboratory screening) was about 8.1 years. In
the 1970s, the average time was 11 years, in the 1980s it was 14.2 years, and in the
early 1990s, it had grown to about 14.9 years. The attrition rate of drug candidates
is also evident in the figure, which shows that for every drug approved by FDA, about
PhRMA, Industry Profile – 2000, 32.
PhRMA, Industry Profile – 2000, 34.
5,000 to 10,000 candidates were initially considered. Of course, nearly all of those
candidates were eliminated by the time clinical trials commenced.
The length of the process has resulted in substantial effort over the years of
trying to reduce the time taken for the various stages. For example, the chart shows
that the average time for FDA approval is about two years. The average period for
approval has dropped significantly in recent years, going from about 30 months in
1990 to about 12.6 months in 1999.44 A sharp drop occurred from 1993 to 1994 and
again from 1997 to 1998. The former was a result of the Prescription Drug User Fee
Act of 1993, which provided FDA with funds to hire several hundred additional
examiners. The latter coincides with the year the Food and Drug Administration
Modernization Act of 1997 took effect. Nevertheless, the approval period remains
relatively short — about 15% of the entire process — and the declines in recent years
have not stopped the trend toward a longer drug development cycle.
The lengthy period for clinical trials has made them a major target for
acceleration as well. There has been some progress on that front as the average
length of trials has dropped from 7.2 years for those underway during the 1993 to
1995 period to 5.9 years for those underway during the 1996 to 1998 period.45
Nevertheless, the need to obtain detailed information about potential side effects and
the requirements for unambiguous results on an investigational drug’s effectiveness
mean that trials are likely to continue to require substantial periods of time — several
years — for the foreseeable future.
The other major contributor to development time is the preclinical phase
consisting of drug discovery and preclinical testing. How long drug discovery takes,
of course, depends on how many compounds must be screened to come up with
attractive drug candidates. If a candidate is discovered early in the process, the period
can be considerably shortened. That is the basic reason for the wide range estimated
for drug discovery — 2 to 10 years — given in the above chart. Drug discovery now
is largely a rational systematic process compared to the trial and error approach that
was dominant a few decades ago (see above), although the number of candidates that
must be screened has not greatly changed. Indeed with the growing application of
combinational chemistry, the number of candidates screened has probably grown. The
“bottleneck” in drug discovery is not finding promising candidates — i.e., those that
bind with the targets — but selecting those candidates that are also likely to become
Drug researchers, however, hope that recent advances in biotechnology will
result in a substantial decrease in time required for drug discovery. Biotechnology
appears to be providing a way to accelerate and systematize the research process at
PhRMA, Industry Profile – 2000, 33.
Zivan, “Understanding Clinical Trials,” 73.
David Searls, “Using bioinformatics in gene and drug discovery”, Drug Discovery Today,
5 (April 2000), 136.
its beginning stages during the search for candidate drugs.47 Important goals are the
development of more precise drugs with fewer side effects (so-called smart drugs),
development of susceptibility markers to treat diseases before onset, production on
a large scale of replacement human proteins (e.g., insulin for diabetes treatment and
erythropoietin for cancer treatment), and elimination of contamination resulting from
the use of human or animal raw material sources for drug chemicals.
The science of genomics — the study of the human genome — facilitates the
investigation of the underlying, genetic cause of diseases and how drugs work. This
approach opens up the possibility of developing theoretical frameworks to identify
therapies. Technologies emerging from genomics might be able to provide ways to
systematically produce and test new molecules that are candidate drugs. One such
process already in use is the comparison of DNA sequenced from diseased tissue with
those in DNA databases.48 If a match is found and the protein expression
characteristics of the DNA in the database are known, it may be possible to determine
the proteins encoded by the diseased sample. If so, drug target identification can be
significantly facilitated with a consequent reduction in drug discovery time. Such
comparisons are made possible by the field of bioinformatics, which applies advanced
computer systems and technology to biology.
Eventually, it is likely to be possible to extend bioinformatics to play a major role
in identification of drug candidates. Such computer-aided design processes have
already been put to use and played a critical role in developing AIDS drugs. The HIV
protease (the enzyme used by the virus to make proteins needed to infect cells) was
modeled in this way and led to the protease inhibitor.49 Full realization of this step
toward computer-aided design of drugs is likely to be facilitated by identifying and
determining the properties of all the proteins expressed by the human genome. This
operation, called proteomics, involves both the identification of the protein and a
determination of its physical structure.50 Finally, gene therapy — the replacement of
errors in the genetic code to prevent the expression faulty proteins or to ensure the
expression of needed proteins — is being examined as a potential way to prevent the
onset of a genetically caused disease in the first place. Because thousands of diseases
are completely or primarily the result of genetic defects, such methods could prove
to be very important for future drug development
Advances in molecular biology also give promise to reducing the cost and
duration of clinical trials. There is hope that the emerging field of pharmacogenomics
or pharmacogenetics — understanding the genetic basis for differing drug response
— will result in the development of drugs that will be more effective and have fewer
adverse side effects than current drugs. Basically, this process uses the genetic profile
of an individual affected by a disease to predict the response of that person to a given
medicine. Researchers hope that such predictions can remove much of the uncertainty
that now exists about whether a drug will work. As a result, faster and more effective
PhRMA, Industry Profile – 2000, 9-13.
Ken Howard, “The Bioinformatics Gold Rush,” Scientific American, 283 (July 2000), 59.
Aldrige, Magic Molecules, 39.
Carol Ezzell, “Beyond the Human Genome,” Scientific American, 283 (July 2000), 64.
clinical trials for new drug therapies should be possible, leading to more rapid drug
approval. 51 Finally, drugs could be designed that are tailored to an individual. 52 In that
last case, of course, the clinical trials would be meaningless. If drug development
does reach this level of sophistication, different drug approval processes will be
While there is much promise in these advances, there are numerous and difficult
challenges to surmount if they are to be widely applied to drug development. The
mapping of the human genome, while a substantial achievement, is only one step. The
targets of drugs, proteins, remain to be understood and surveyed in a way that will
facilitate the search for new drug candidates.53 The enterprise of proteomics will be
long and costly and is just now getting underway.54 Because protein structures are
very complicated and are an essential feature in determining a protein’s function, such
surveys require a three-dimensional image of the protein (structural genomics).
Obtaining these images requires the use of complex X-ray crystallography.
As noted above, only about 500 drug targets have currently been identified, a
very small fraction of all of proteins in the body. While not all proteins will end up
as drug targets, some estimates are that the human genome map will eventually yield
up to 10,000 new targets.55 Another challenge is that the proteins most important for
drug design, e.g., membrane proteins that control input to a cell, appear to be those
most difficult to survey because of difficulties in determining their structure.56
Identification of drug targets, of course, is only part of the battle. Drug
candidates must be discovered that bind to the target. Identifying such candidates
require experimental procedures that are still very complex and subject to many
failures. Furthermore, while a particular molecule might bind with a given drug target
and result in apparent therapeutic action, that is no guarantee that it will be successful
as a drug. Doses at toxic levels may be required to achieve the desired results. In
other cases, the investigatory drug molecule may bind to other proteins, resulting in
unwanted side effects.
In addition, it is too soon to tell just how effective the genetic advances will be
in shortening the time required for clinical trials. The response of an individual to a
drug is very complex and it is likely to take some time before researchers, regulators,
and consumers will accept more specific, shorter trials to prove drug safety and
efficacy. Nevertheless, recent advances are substantial and hold out much hope for
a dramatically improved pharmaceutical R&D process.
Allen D. Roses, “Pharmacogenetics and future drug development and delivery,” Lancet, 355
(April 15, 2000), 1358.
Eric S. Grace, Biotechnology Unzipped: Promises and Realities, 88.
Robert Service, “Structural Genomics Offers High-Speed Look at Proteins,” Science, 287
(March 17, 2000), 1954-56.
Aldridge, Magic Molecules, 257.
Service, “Structural Genomics,” 1956.
R&D Costs. The cost of developing a typical drug (pharmaceutical R&D) is
not well established. One source cites costs for R&D for a successful drug of about
$116 million in 1976, about $287 million in 1987, about $359 million in 1990, and
about $500 million in 1996.57 All are in 1990 dollars. The 1990 figure was obtained
from a study carried out by the Office of Technology Assessment and is the cost
estimated before taxes.58 The most recent figure is an estimate provided by PhRMA
and is based on drugs introduced in 1990.59 These estimates are before taxes, and
cover both successful and unsuccessful drug development attempts.
Also important is how R&D costs are allocated among the various components
of the R&D process. The chart shown in Figure 2, based on data from PhRMA,
provides a graphical display of how those costs are allocated.60 It is clear from the
Figure 2. R&D Cost Allocations by Stage - 1998
Synthesis and Extraction
Toxicology and Safety Testing
Clinical Evaluation: I,II,and III
Clinical Evaluation: IV
Regulatory: IND and NDA
chart that clinical trials consume the major share of the costs, about 28.3% for Phases
I through III, and an additional 5.8% for Phase IV. In addition, the actual drug
discovery phase — synthesis and extraction and biological screening — requires about
General Cost Issues A major importance of the cost of pharmaceutical R&D lies
in the claim made by the industry that prescription drug prices in the United States are
justified by the high cost of developing new drugs. As a consequence, any debate
about those prices usually includes a debate about the costs of doing pharmaceutical
Drews, In Quest of Tomorrow’s Medicine, 149
U.S. Congress, Office of Technology Assessment, Pharmaceutical R&D: Costs, Risks, and
Rewards, OTA-H-522, February 1993, 16.
PhRMA, Industry Profile – 2000, 25.
R&D. While it is beyond the scope of this report to present a detailed analysis of
those costs, a few points can be made about them that may be important for any
debate over costs.
First, there have not been many detailed studies of the costs done by
disinterested groups. The last such study was the OTA effort which was completed
in 1993. Data used for that study were obtained on drugs developed during
the1980s.61 No results have been reported on drugs developed in the last 10 years
that might have benefitted significantly from the recent advances in molecular biology.
Second, the calculation of those pharmaceutical R&D costs that have been
reported all contain a factor accounting for the cost of capital.62 This cost element
accounts for the opportunity cost of money invested in the R&D process. In other
words, the funds used for R&D could have been used for other investments
(opportunities) that will yield a return. Those ‘lost’ opportunities are accounted for
by including the forgone returns as part of the cost of performing R&D. Including
such costs is a standard accounting practice used by all of industry in computing R&D
costs. In the OTA estimate, opportunity costs constitute about 65% of the total R&D
cost for a typical drug. The key element in calculating the foregone returns is the cost
of capital, which is determined by the discount rate assumed. A change of a few
percentage points in that rate can make a substantial difference in the total R&D
cost.63 While most analysts agree with the inclusion of opportunity costs, there is
dispute over the size of the discount rate assumed. Industry officials generally agreed
with the rates used by OTA but some critics argued they were too high.64
Third, there is a disagreement about whether pretax or after-tax costs are the
more appropriate figure for pharmaceutical R&D costs.65 For the OTA study, the
after-tax estimate is $194 million compared to the pretax estimate of $359 million.
This difference is substantial. It should be noted, however, that the marginal tax rate
used in the OTA study, 46%, has since been reduced to 34%. As a result, the
pretax/after- tax differences calculated on current pharmaceutical R&D costs would
be considerably smaller than in the OTA case, but still large. On the other hand, the
OTA, Pharmaceutical R&D, 48-54.
It should be remembered that costs presented in this section include the cost of capital while
those in the section on clinical trials above do not.
Joseph A. DiMasi, “Trends in Drug Development Costs, Times, and Risks,” Drug
Information Journal, 29 (May 1995), 375.
George Anders, “Vital Statistic: Disputed Cost of Creating a Drug,” The Wall Street
Journal, November 9, 1993, B1.
OTA calculation did not account for the research and experimentation tax credit 66 or
any tax credits available for orphan drug development.67
A fourth consideration is whether the sales of successful drugs cover
pharmaceutical R&D costs. According to the industry, a 1994 study found that only
three out of ten pharmaceuticals introduced from 1980 to 1984 had enough sales to
cover average R&D costs per drug.68 Those sales, however, were sufficient to cover
the industry’s total R&D costs. In fact, the OTA study found that the internal rate of
return (IRR) for the entire pharmaceutical industry from 1976 to 1987 exceeded the
returns to other firms by about two to three percentage points.69 This IRR differs
from the standard accounting return on assets that are usually reported in publically
available statements from individual firms.70 Comparison of the return on assets for
the same companies for which the OTA IRR comparison was made showed that
pharmaceutical companies outperformed other firms by four to six percentage points
over the 1976 to 1988 period. While there has been no more recent study of IRR
comparison, data on return on assets from 1995 through 1999 continues to show that
pharmaceuticals as a group outpaces all other industry groups and in nearly all cases
the margin is greater than two percentage points.71 It should be noted that the
pharmaceutical industry generally contends that return on assets overstates the
industry’s profitability because drug patents are not counted as assets in standard
accounting practices used to determine this measure.
Contribution of Federal R&D Funding. Another point of discussion
is the contribution of federally-funded biomedical research to pharmaceutical
development.72 Nearly all of that research is supported by the National Institutes of
Health (NIH).73 In FY2001, NIH’s total budget was $20.31 billion, about 60% of
which goes for basic biomedical research and most of the remainder for clinical
research. NIH basic research focuses on the biological, chemical, and molecular
understanding of disease. Drug development is not its mission, although drugs do
Congressional Research Service, The Research and Experimentation Tax Credit: Current
Law and Selected Policy Issues for 106th Congress, by (name redacted),RL30479, Jan. 23,
Orphan drugs are those for which the potential market is small — 200,000 or fewer patients.
A 50% tax credit on qualifying R&D is provided for those drugs as well as seven years of
market exclusivity (P.L. No. 97-414, 96 Stat. 2049 (1983) (codified at 21 U.S.C. § 360aa et
PhRMA, Industry Profile – 2000, 25.
OTA, Pharmaceutical R&D, 24.
For an discussion of the difference between IRR and the return on assets see OTA,
Pharmaceutical R&D, 95-96.
See, for example, “Most profitable industries,” Fortune, April 17, 2000, F-27.
For an extended discussion of federal support of pharmaceutical R&D, see OTA,
Pharmaceutical R&D, 201-235.
The National Science Foundation, the Department of Energy, the Department of Defense,
the Veterans Administration, and the National Aeronautics and Space Administration, and the
Environmental Protection Agency also fund biomedical research.
result from discoveries made by NIH-funded research.74 While in some instances
testing of actual drug candidates may be funded by NIH,75 in most cases it is the
knowledge of the disease mechanisms gained from the NIH-funded research that
allows pharmaceutical companies to proceed with drug discovery.76 It is common for
the pharmaceutical industry to develop drugs from scientific discoveries made by
researchers supported by the NIH.77 In addition, over the last 20 years, Congress has
enacted a number of laws to enable cooperative research arrangements between
industry and government in order to facilitate the commercial application of
knowledge discovered through federally-funded research.78 These laws have been
particularly successful in the areas of biomedical research.79
It seems clear that the pharmaceutical R&D cost estimates reported above
understate the true cost by not including federally funded R&D that contributed to the
ultimate development of the drug. That is, if the pharmaceutical industry had to pay
for all of the basic research now funded by NIH, it is likely that the average cost of
R&D to bring a drug to market would increase, perhaps substantially. 80 While the
industry does fund a significant amount of basic research, most of its R&D funding
is directed at drug discovery and development, and clinical trials. Estimates of the
contribution of NIH-funded research to pharmaceutical R&D costs are usually not
attempted because of the great difficulty of assigning basic research costs to specific
innovations. There is generally not a direct linear relationship between basic research
and specific innovations, but rather the connections are quite complex.
For the NIH-funded research that is focused on specific drug development, the
allocation of costs is less difficult but still uncertain. The OTA study estimated that
about 14% of preclinical pharmaceutical R&D in 1988 was funded by NIH. NIH also
funds clinical research, as noted above, although most of that support is usually
reserved for high-risk therapies not likely to yield high profits, and that would be of
limited benefit to the industry.81 A certain fraction of NIH clinical trial funds does
directly support pharmaceuticals, however, and OTA estimated that about 11% of all
pharmaceutical R&D funds allocated to clinical trials in 1988 came from NIH.
Iain M. Cockburn and Rebecca Henderson, “Publicly Funded Science and the Productivity
of the Pharmaceutical Industry,” NBER Conference on Science and Public Policy, National
Bureau of Economic Research, Washington, DC, April 2000, 12.
OTA, Pharmaceutical R&D, 202.
Cockburn, “Publicly Funded Science,” 12.
Jeff Gerth and Sheryl Gay Stolberg, “Drug Companies Profit From Research Supported by
Taxpayers,”New York Times, April 23, 2000.
Congressional Research Service, Federal R&D, Drug Discovery, and Pricing: Insights
from the NIH-University-Industry Relationship, by Wendy Schacht, RL30585, June 19,
Jeff Gerth, New York Times, April 23, 2000.
If total R&D expenditures did not change, the increased cost of R&D for a typical drug
under these circumstances would likely mean that fewer new drugs would be developed.
Zivan, “Understanding Clinical Trials,” 75.
These figures suggest that the cost of pharmaceutical R&D to the industry for
a typical drug would increase significantly if it had to absorb all of the costs that now
directly support drug development but which are funded by NIH. It would likely be
an even greater increase if the costs of all of the contributing basic research now
funded by NIH could somehow be allocated to drug development. The outcome of
such a situation could be a noticeable increase in the price of an average drug to the
extent those prices cover R&D costs. Furthermore, to the extent the total industry
expenditures on R&D did not grow, the number of new drugs developed would likely
decrease. Therefore, one could argue that federal funding of biomedical research is
helping to keep drug prices down. This possibility is indirectly raised by analysis that
puts the rate of return to the industry of public biomedical research funding at 30%.82
This benefit appears substantial, but that is no guarantee that another allocation
of public and private R&D resources — e.g., the pharmaceutical industry supporting
all biomedical research — could not produce a higher return. While it is not the
purpose of this report to present an analysis of this issue, it is worthwhile to present
some considerations important to that analysis. If industry had to fund the basic
research that contributes to drug development that is now funded by NIH, it probably
would not support all of the research now funded by NIH. Industry would very likely
restrict funding to that it believed most relevant to pharmaceutical development, and
total national spending on biomedical R&D — public and private sectors — would
be less than is now the case. In this hypothetical situation where industry would
absorb all basic biomedical research costs needed for drug development, the cost of
R&D to develop a typical drug would increase from current estimates. Because total
spending on basic biomedical research would be lower than is currently the case,
however, the return on that investment, in terms of pharmaceuticals produced, would
be higher than current estimates, provided no change in output — discovery and
marketing of new pharmaceuticals — occurred.
Whether productivity could remain the same under this scenario would depend
primarily on the pharmaceutical industry being able to select just the basic research
now funded by NIH needed to maintain industry productivity. As discussed above,
such research includes both basic research that is directly related to drug development
and basic research that advances general biomedical knowledge important for drug
discovery. It is very unlikely that the industry would be able to make such a selection
given the uncertain nature of basic research. In addition, it is possible, in this
hypothetical situation, that important knowledge that would be essential to the
advances of biomedicine in the more distant future — 10 to 20 years — would not be
forthcoming because the research had not been done. Another concern about this
scenario is what happens to the basic research results. It is unlikely that a firm would
be willing to make these results widely available if it believed they were important for
its economic future. As a result, researchers outside that firm would not have access
to new biomedical knowledge that may be critical to other advances in medicine, with
a consequent loss to the public.
Also, even though the economic benefit from NIH research quoted above
appears substantial, that is no guarantee that the public is adequately compensated for
Cockburn, “Publicly Funded Science,” 18.
the subsidy that federally funded biomedical R&D provides to the industry. There are
other factors that must be accounted for to assess that issue thoroughly. 83
Implications of Biomedical Advances. The high and apparently
growing cost of pharmaceutical R&D puts a premium on any advances that will slow
that growth or even reduce costs. Shorter drug development time would mean
smaller direct outlays for R&D. Furthermore, because the opportunity costs
(described above) accumulate on an annual basis, a shorter development time would
mean that this contribution to pharmaceutical R&D costs would decline as well. The
biomedical advances discussed above in the section on drug development time, if
successful, offer that opportunity. Cost mitigation would be especially true if those
advances allowed a significant decrease in the time required for the clinical trials,
which are the biggest single component of the cost of drug development.
Reduced pharmaceutical R&D costs for a typical drug could, in turn, have at
least two advantages. First, it is possible that lower pharmaceutical prices will result.
Second, drug companies may be more willing to undertake research on drugs that
have a more limited market — that is, on drugs that attack diseases that afflict only
a relatively small number of people. Now, such research is generally limited because
the companies cannot expect to recover their R&D costs with sales of those drugs.84
If shorter development times significantly reduce such costs, the prospect of being
able to recover costs from a more limited-market drug should increase. Coupled with
the increase in precision in targeting diseases that is promised by these new
techniques, research on such drugs could expand. Another benefit of shorter
development time would likely be greater total revenues to the firm patenting the drug
because less of the patent period would be taken up by drug development. It is
possible that such an occurrence could also lower drug prices because the firm would
have more time to make a return on its drug development investment.
There are factors, however, that may limit the extent to which application of
these biomedical advances can result in lower drug development costs. First, as noted
above, there is uncertainty about how well these advances will translate into more
effective drug development with shorter development times. Second, application of
these techniques is likely to require very large initial investments in equipment and
facilities. The genetic profile process, for example, requires complex and extensive
robotic systems that are not typically found in conventional drug discovery processes.
Nevertheless, to the extent these new drug development techniques are successful, the
promise of lower drug R&D costs and more specific drugs appears real.
There are several issues associated with drug development (pharmaceutical
R&D) that may be of interest to Congress. Three of the more important issues
concern the cost of pharmaceutical R&D and its relation to prescription drug prices,
CRS, Federal R&D, Drug Discovery and Pricing, 18-19.
The Orphan Drug Act (see footnote 67) provides incentives to pharmaceutical
manufacturers to develop drugs for diseases that afflict 200,000 people or fewer and may not
otherwise generate sufficient returns to justify the necessary R&D.
the role of federally funded R&D (primarily NIH) in pharmaceutical development, and
federal oversight of the drug development process.
Drug Development Costs. The options open to Congress to affect the cost
of pharmaceutical R&D appear to be limited. It has taken steps, as noted above, to
shorten the time of drug approval. Further shortening may not be acceptable to
Congress or the public, however, and is not likely to affect costs very much while the
rest of the development cycle remains as long as is now the case. Congress has also
granted a general research and experimentation tax credit as well as a specific R&D
tax credit for the development of orphan drugs. As argued above, however, significant
changes in those costs will probably require major advances in drug discovery that
also permit much shorter clinical trial periods. These advances will be almost solely
dependent on progress in science and technology. If a dramatic shortening of clinical
trials appears scientifically feasible, however, drug approval regulations may have to
be modified in order to accommodate those new conditions.
Federal Biomedical R&D Funding. One area where congressional action
may significantly affect pharmaceutical R&D costs in the longer-run is through federal
biomedical R&D funding. Congress has provided NIH with substantial year-to-year
increases in its budget. From FY1998 to FY2001, the budget has grown from $13.6
billion to $20.3 billion, a 49% increase. For FY2002, the Administration is requesting
$23.1 billion, a 13.8% increase over the current fiscal year. It is on track to double
by 2003 to a level of about $27 billion, although it is not certain that doubling will
happen by that time. The primary reason for this increase is to accelerate the push
towards the development of effective therapies for the major diseases afflicting
humankind. As noted above, there appears to be little overlap between the R&D
funded by NIH and that funded by the pharmaceutical industry. Furthermore, the
research sponsored and performed by NIH appears to be quite important to the
As NIH funding grows, however, there is the possibility that a greater portion
of it will be used in areas that are also being funded by the pharmaceutical industry,
including biotechnology firms. This is true of the human genome project and is likely
to be true of much of the followup work. In particular, both NIH and the industry are
funding work in structural genomics,85 which is an essential part of proteomics, the
next step beyond mapping the human genome. NIH is funding pilot centers to
develop methods of determining the structure of proteins, while industry has several
projects underway. Because knowledge of protein structures is critical to drug
discovery, it seems clear that it is important for industry to fund it. That does not
imply that NIH should not fund any research in structural genomics — knowledge of
protein structures is also important for the understanding of fundamental biological
processes — but caution is needed to avoid unproductive duplication. It should be
noted that the synergy between federal and private funding of the human genome
project has probably accelerated completion of that effort.
A related issue concerns ownership of the information generated by both public
and private funding. The debate over whether human genome data generated by
Service, “Structural Genomics”, 1954.
private companies should be made available to the public when the government is also
funding such work is likely to be repeated with protein structure data. The fact that
data generated by both efforts were complementary helped to smooth possible
conflicts in the case of the genome. Because protein structure data is likely to be even
more important to the pharmaceutical industry than genome data, however, data
ownership issues may become more serious. If conflicts do emerge, NIH may end up
duplicating much of the industry work to ensure broad public access. Congressional
oversight of situations where both the industry and NIH independently pursue
research related to drug development may be heightened.
Clinical Trial Practice. While Congress has direct oversight of clinical trials
supported by NIH, congressional authority over trials supported by the
pharmaceutical companies is more tenuous and indirect. It is primarily through its
oversight of the FDA, which, as noted, has oversight and some regulatory
responsibility over privately run clinical trials. Aside from the possibility of major
changes in clinical trial practice resulting from scientific advances, there are some
aspects of current practices that Congress may wish to examine. Two such topics are:
patient protection and conflict of interest. While neither is likely to affect the length
of time that clinical trials now take, they could have a significant effect on the quality
and safety of such trials.
The death in September 1999, of a patient undergoing an experimental gene
therapy treatment at the University of Pennsylvania has highlighted the possible
dangers of participation in clinical research.86 While trials are overseen by an
Institutional Review Board and individuals must sign informed consent statements
prior to participation in a trial, there are concerns that adequate protection for patient
safety is not always present. Such protection is essential if trials are to continue to
secure the numbers of patients needed to adequately test drug candidates. Currently,
the Department of Health and Human Services, with the establishment of the Office
of Human Research Protection, is significantly expanding its efforts in this area.87
Recently, concern about conflict of interest on the part of physician-researchers
involved in clinical trials has grown.88 The potential for conflict is a result of a
growing number of academic researchers being involved in research funded by the
pharmaceutical and biotechnology industries. Since the beginning of the modern
pharmaceutical industry, there has been a close relationship between the industry and
universities.89 The last two decades have seen a growth of cooperative research
Zivan, “Understanding Clinical Trials,” 72.
Bruce Agnew, “Koski takes over HHS Office for Human Research Protection, plans a tough
approach on conflict of interest and overall human-subjects protections,” Washington Fax,
F-D-C Reports, Inc., September 7, 2000.
See e.g., David Korn, “Conflicts of Interest in Biomedical Research,” JAMA, 284 (Nov. 1,
Ralph Landau, Basil Achilladelis, and Alexander Scriabine, Pharmaceutical Innovation:
Revolutionizing Human Health (Philadelphia: Chemical Heritage Press, 1999), 38.
between industry and NIH-funded academic researchers.90 As a consequence, the
linkage between academic scientists and the pharmaceutical industry has intensified
substantially. Some have argued that this growing tie poses a risk to public
confidence in the results of clinical trials performed by these researchers.91
Because industry contracts with universities for a significant fraction of the
clinical trials it undertakes — about 40% of industry funding for clinical trials in 1998
went to universities92 — it seems important that effective safeguards be in place to
protect against abuses resulting from potential conflicts of interest. Currently,
regulations from the Public Health Service (PHS), issued in 1995, deal with conflict
of interest in federally funded clinical research. In addition, the FDA has regulations,
issued in 1998, requiring financial disclosure from clinical investigators. They leave
management of potential conflicts of interest up the individual institutions, and there
is considerable variation among those institutions.93 Some argue that certain kinds of
financial ties between academic researchers and the pharmaceutical industry should
be prohibited altogether.94 Others argue that such ties do not need to be banned, but
a better job of managing financial conflicts of interest is needed by the institutions
In 2000, the Department of Health and Human Services began consideration of
new conflict-of-interest rules. The director of the then newly established Office for
Human Research Protection (OHRP) announced that the office would seek to
establish more stringent conflict of interest standards.96 On January 10, 2001, the
OHRP issued a “draft interim guidance document” on financial relationships in clinical
research. The document also contained a request for comments due by March 2,
2001. The new guidelines are not meant to replace existing regulations of PHS
agencies, including FDA, but to “help IRBs [Institutional Review Boards], Clinical
Investigators, and Institutions in carrying out their responsibilities to protect human
subjects” under existing regulations.97 The draft guidelines recommend, among other
things, that universities limit the direct participation in clinical research of scientists
CRS, Federal R&D, Drug Discovery and Pricing, 4-7.
Catherine D. DeAngelis, “Conflict of Interest and the Public Trust,” JAMA, 284 (Nov. 1,
Thomas Bodenheimer, “Uneasy Alliance: Clinical Investigators and the Pharmaceutical
Industry,” The New England Journal of Medicine, 342 (May 18, 2000), 1540.
Mildred K. Cho, Ryo Shohara, and Anna Schissel, “Policies on Faculty Conflicts of Interest
at US Universities,” JAMA, 284 (Nov. 1, 2000), 2204.
Marcia Angell, “Is Academic Medicine for Sale?” The New England Journal of Medicine,
342 (May 18, 2000), 1518.
Jordan J. Cohen, “Trust Us to Make a Difference,” AAMC Annual Meeting, October 29,
2000, Chicago, IL. [http://www.aamc.org/newsroom/speeches/00amspee.htm]
Bruce Agnew, Washington Fax, September 7, 2000.
Public Health Service, U.S. Department of Health and Human Services, Financial
Relationships in Clinical Research: Issues for Institutions, Clinical Investigators, and IRBSs
to Consider when Dealing with Issues of Financial Interest and Human Subject Protection,
January 10, 2001, [http://ohrp.osophs.dhhs.gov/nhrpac/mtg12-00/finguid.htm].
who could be influenced by financial ties to the sponsoring firm; that research
institutions consider whether it is appropriate for its scientists to participate in
research sponsored by firms in which the institution has investments; and that conflictof-interest committees should be established by universities to review financial links
of individual scientists.
In addition, the Association of American Medical Colleges (AAMC) established
a task force to look at the issue. On February 13, 2001, a group of leaders of the
nation’s medical schools receiving the most federal research funds issued a set of
recommendations for the AAMC task force to consider.98 These recommendations
include, among other things, that financial interests of researchers taking part in trials
be disclosed to the IRBs and that they be reviewed periodically. The
recommendations were endorsed by the AAMC. The group also recommended that
responsibility for such disclosure be expanded to everyone directly involved in the
While these recommendations appear to move towards better control of potential
conflict-of- interest problems, they still would leave much of the management of those
situations with the institutions. In addition, the contract research organizations
(CROs) are only addressed to the extent academic researchers are involved in the
trials managed by the CROs. It appears, therefore, that monitoring of both university
and CRO efforts will be important to ensure that public confidence in clinical trials
and in the academic biomedical research community does not suffer.
The debate about whether to include prescription drug benefits in Medicare has
raised the visibility of pharmaceutical R&D. As noted in this report, pharmaceutical
R&D is a complex, costly, and time-consuming process. It is also noted, however,
that advances in molecular biology in recent years hold the promise of dramatically
changing the way pharmaceutical R&D is carried out. These changes could shorten
substantially the time it takes to bring a drug to market from initial research and
therefore significantly affect the cost of drug development. How fast such changes
may come about, however, could depend heavily on further research in molecular
biology and the mechanisms of disease. Congress has strongly supported biomedical
research in recent years and there are calls for continuing to make it a high priority.
In addition to biomedical research funding levels and priorities, issues related to
human subject protection and conflict of interest are likely to affect the evolution of
pharmaceutical R&D and, therefore, its costs.
Shirley Haley, “Leaders from top-funded medical schools release recommendations for
managing financial conflicts of interest: principles will be basis of AAMC task force
deliberations,” Washington Fax, F-D-C Reports, Inc., February 14, 2001.
A Brief History of Pharmaceutical Research and Development
Although substances have been used to treat disease for centuries, systematic
pharmaceutical research did not begin until the late 19th century when chemistry had
reached the point where its principles could be applied to medical problems and
pharmacology became a scientific discipline. A major linkage occurred in the
chemical dye industry when it was discovered that certain dyes have a chemical
affinity for biological materials. German scientist, Paul Ehrlich (1854-1915), a
pioneer in pharmaceutical research, determined that this “chemoreceptor” property
would be different for certain organisms, such as parasites and cancer cells, than the
host tissue, and this difference allowed the development of chemicals that could be
used for therapeutic purposes.99 He based this observation on experiments in which
he synthesized a large number of compounds and testing each for its ability to destroy
the organism without being toxic to the host. The basis for this process was Ehrlich’s
observation that certain chemicals would selectively attach themselves to proteins.100
At the same time, developments in chemistry permitted the isolation of active
chemicals from plants that showed medicinal benefits. This was followed by efforts
to standardize drug preparations. Medicinal chemistry also developed when it was
discovered that coaltar could be used to create synthetic drugs. In addition, the
science of pharmacology — the measurement and testing of the effectiveness of drugs
— was being developed. These developments all combined to provide the impetus
for the creation, from 1880 to about 1930, of the modern pharmaceutical industry.
The discovery of penicillin in 1929 led to the discovery of other antibiotics using
the science of microbiology. The concepts of enzymes and receptors arising from the
study of biochemistry began to play a role in drug discovery when they were found
to be good targets for drug research. An important discovery was that receptors
serve as switches to generate or receive signals to the cell, and that these receptors
could be either blocked or turned on by chemicals.101 During World War II, the
demand for penicillin and other antibiotics allowed the drug companies to develop the
infrastructure and organization to undertake major R&D efforts. After the war, drug
research accelerated because of the numerous opportunities and the large profits new
Drug discovery, however, was still largely a trial and error process. That is,
compounds were tried that were obtained somewhat haphazardly from libraries of
molecules available to drug researchers. Those libraries were built up over the years
Drews, “Drug Discovery: A Historical Perspective,” 1960.
Landau, et.al., Pharmaceutical Innovation: Revolutionizing Human Health, 39-40
Drews, “Drug Discovery,” 1961.
National Research Council, “U.S. Industry in 2000: Studies in Competitive Performance”,
Pharmaceuticals and Biotechnology, (National Academy Press, Washington, DC, 1999),
because it was thought that the compounds, many of which were obtained from
natural substances, might have some therapeutic value. In the 1960s and 1970s,
advances in both life science research and chemistry greatly improved the drug
research process, making it less random. 103 The focus of the life science research was
the physiology of the cell, which allowed for design of specific drugs and greater
understanding of how drugs worked than had been discovered through trial and error.
In particular, as knowledge grew, drugs could be designed to inhibit well-defined
proteins. Also, once the actions of certain drugs were understood, that knowledge
was often used for greater understanding of the underlying disease, and, in turn, the
design of new drugs. Advances in chemistry permitted systematic generation and
testing of chemical compounds (combinational chemistry) as candidate drugs. The
advances in both fields combined to make the drug discovery process more rational.
The 1960s also saw the development of the modern process for getting a drug
to market. Beginning in 1938, drugs were required by the federal government to
prove that they were safe.104 It was not until the thalidomide episodes in the late
1950s, however, that the requirement for clinical evidence was established to gain
approval to market a new drug. The Kefauver-Harris amendments passed by
Congress in 1962 required a proof-of-efficacy and gave the FDA regulatory control
over the necessary clinical trials.105 At that time, the present-day process of elaborate
clinical trials was established for determining the efficacy of candidate drugs.
Advances in molecular biology and biotechnology in the 1970s and 1980s have
also contributed to drug research.106 Biotechnology was first applied to drug
development by bringing about dramatic increases in the production of certain drugs
such as insulin whose efficacy was already established. Biotechnology was also used
to enhance the search for new drugs. As molecular biology progressed, these two
paths merged so that medical biotechnology is now primarily focused on the search
for new drugs such as protease inhibitors used to treat AIDS, which must be
produced by genetic engineering techniques.
Drug research over the last 120 years has evolved from a trial and error method,
where many compounds were tried for their potential therapeutic value with only a
little understanding of how they might work, to a much more rational approach that
is based on a large body of knowledge about the origin of disease and workings of
pharmaceuticals. Currently, drug discovery makes use of many disciplines, including
chemistry, pharmacology, microbiology, and biochemistry. Sources for candidate
drugs still include natural substances (such drugs are called biologics) as well as
synthetic molecules created by chemical or biotechnology processes.
Landau, et.al., Pharmaceutical Innovation, 91-92.
This action resulted from a tragic situation when 107 people died while taking sulfanilamide
in a liquid form. Drews, In Quest of Tomorrow’s Medicine, 141.
National Research Council, U.S. Industry in 2000, 375.
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