The National Institutes of Health (NIH) is the principal federal agency that supports and conducts biomedical research on the prevention and treatment of disease. It is the center of biomedical research in the United States and the foremost medical research enterprise in the world, with a budget in 2001 of $20.3 billion. An agency of the U.S. Public Health Service, it is a part of the U.S. Department of Health and Human Services. There are twenty-seven institutes and centers that comprise the National Institutes of Health, and the research supported by these institutes ranges from basic molecular and genomic biology to translational and applied studies involving individuals and large populations. Training for careers in biomedical research is also an important part of the NIH mission, as is the dissemination of information from this research to the public, to health providers, and to scientists.
History of Nih
The history of NIH reflects an interweaving of the disciplines of public health, medicine, and basic biology, with a changing emphasis among these areas as health science progressed. The NIH had its origins in the Laboratory of Hygiene, which was created in 1887 to research cholera and other infectious diseases. The laboratory was an out-growth of the Marine Hospital Service created in 1798 and, in turn, became the Public Health Service in 1912. Early activities focused on infectious and communicable diseases brought to the United States on incoming ships, and on the prevention of epidemics of yellow fever and cholera. In 1914, Dr. Joseph Goldberger described his findings that pellagra was a nutritional deficiency disease, rather than an infectious disease, and could be prevented by appropriate diet. This discovery marked a shift from infectious disease investigation. Research on the importance of nutrition in disease causation was fostered by this discovery, and the essential nature of vitamins in health followed.
The modern era of NIH began in 1930 with the redesignation of the Hygienic Laboratory as the National Institute of Health. In 1935, 45 acres of land in Bethesda, Maryland, were donated for the use of the National Institute of Health. Additional gifts of land were made and the buildings and grounds on the current site and were dedicated in 1940.
The National Cancer Institute Act was passed in 1938, and the first awards for research fellowships were made the following year. Laboratories at NIH were important in improving prevention and medical care during World War II. The contributions of science to the war effort provided a compelling rationale for the remarkable investment in biomedical research that followed during the second half of the twentieth century.
The Public Health Service Act of 1944 provided the legislative authority for post–World War II research programs and made the National Cancer Institute a part of NIH. In 1948, the National Heart Institute was authorized, and the name of NIH officially became the National Institutes of Health. The research emphasis shifted to investigation of basic biology and biochemistry and the disorders of biology that lead to disease. Prevention and treatment of diseases have been based largely on understanding the fundamental alterations in biology following World War II. Support for research conducted at colleges and universities also increased with an expanding budget. Other institutes and centers have been authorized and totaled twenty-seven in 2001. A clinical center on the Bethesda campus was dedicated in 1953 as the principal on-campus or intramural resource for clinical research. This facility combines patient facilities (inpatient and outpatient) with laboratories to foster integration of research from patient to laboratory.
During the second half of the twentieth century, the breadth and complexity of biomedical research activities conducted at NIH and supported at non-NIH sites increased. From 1950 onward, research emphasis shifted to chronic diseases, which had assumed epidemic proportions in the United States and other industrialized countries. Basic levels of molecular biology and genomics were increasingly probed. This led to an important benchmark at the turn of the millennium—the publication of the human genome map. Information on the inherited susceptibility and the interplay between genetic and environmental factors will eventually provide insights that will be translated into practical research.
Studies of large populations, like the Framingham Heart Study, have also been initiated by NIH to delineate risks for disease. Similarly, large interventional trials have tested effective means of preventing and managing these risks. These investigations were an outgrowth of an improved understanding of disease causation and the need to extend these findings to patients and populations. The growth of knowledge has been exponential, and the investment in biomedical research has produced a remarkable return to the public in improved health and increased longevity. Political support for the NIH budget has been consistent and bipartisan, reflecting broad public-interest support and confidence in the benefits of health research.
Support of Research
Research activities are conducted in the laboratories of NIH by intramural scientists and are further supported through extramural grants and contracts at 2,570 academic and research facilities in the United States and worldwide. The NIH laboratories and clinical facilities are located principally in Bethesda, Maryland, with additional laboratories located elsewhere in Maryland and in Montana. Intramural research accounts for only about 10 percent of the budget of NIH. The overwhelming majority of funds thus support research being conducted at extramural sites. These extramural research studies are supported by grants and contracts awarded to nonfederal scientists working in universities, medical schools, hospitals, and research institutions. In 2000, there were over 37,000 grants and contracts supporting research and over 16,000 grants supporting research training.
Both intramural and extramural research undergoes rigorous scientific review before being funded, and oversight continues during the course of the work. Investigators who want to conduct research prepare an application describing the proposed work. This application can be initiated by the investigator, or it can be submitted in response to an NIH-initiated solicitation. Grants and contracts to non-NIH institutions and scientists are awarded after review and evaluation by panels of scientists expert in the particular research area for which support is requested. These proposals are reviewed and scored for scientific merit and relevance.
The initial scientific review by scientific peers is followed with review by an advisory council of senior scientists representing the institute or center involved, and this council is charged with over-seeing the development of a balanced portfolio of sponsored research. The grants and contracts are funded by the institutes and centers from funds appropriated to them by Congress. This review by panels of nongovernmental scientific peers (the peer-review system) has been fundamental to the evaluation and support of meritorious research and to sound investment of public funds in research. The process of peer review is now used by many other governmental and nongovernmental organizations in the United States and internationally. The researchers report on progress during the conduct of the project and, importantly, report their results in journals and meetings, making the findings available to other investigators and to the public.
Organization and Scope of Nih Research
The NIH supports and conducts research at all levels of scientific inquiry, from molecular biology through clinical research on individuals, to the study of large groups and communities. Support for training is provided at the levels of predoctoral, postdoctoral, and established investigators. Training is supported for all levels of scientific study. The institutes and centers typically support research and research training related to a specific condition (e.g., cancer, heart disease) or phase of life (e.g., child health and human development, aging) or for cross-cutting issues (e.g., health disparities, complementary and alternative medicine). Some centers are engaged in scientific review or support of research resources.
The development of the institutes has followed the evolution of public and Congressional interest in diseases and health issues. There is now a belief that research should be the foundation for health policy, medical care, and public health action. The orientation by condition or phase of life has derived from public and Congressional advocacy related to medical and public health issues. One strength of this organizational structure is the integration of basic scientists with clinical researchers in the investigation of diseases.
This vertical integration allows scientists to unite basic biology with clinical and public health science and to promote a translation of scientific advances to human clinical studies. This integration occurs in both intramural and extramural research programs, and both clinical and public health applications benefit from this orientation. Clinical research flourishes with the integration of basic research, and this has influenced medical training and specialty emphasis. Each institute or center supports the full spectrum of research, with a few exceptions.
The vertical organizational structure of the NIH requires special efforts to integrate research across the institutes at each scientific level—a horizontal integration. The commonalities of basic biologic mechanisms compel collaboration among scientists who might be studying, for example, the biology mechanisms involved in cancer or heart disease. Similarly, there are joint risks for conditions such as cancer and heart disease and this requires collaborative study of the risks to exposed populations. During the 1990s, the institutes emphasized cross-institute and trans-NIH research to afford an integration of populational research across institutes. To foster this integration, several programmatic offices within the Office of the NIH Director have been developed. The Office of Disease Prevention and the Office of Behavioral and Social Sciences Research are examples. These offices work with the institutes to develop crosscutting research in the areas of prevention and behavioral research, respectively, and to coordinate activities with other federal agencies and the private sector.
Examples of the vertical and horizontal integrations illustrate how this structure advances knowledge. The mapping of the human genome and discovery of specific genes related to particular diseases afford an opportunity to identify individuals at risk for disease and to develop approaches that might modify this risk and prevent disease. Importantly, the interplay between genetic and environmental risk can be determined and appropriate interventions developed. Variations of BRCA-1 and BRCA-2 genes were found in studies of families having a high risk of breast cancer, for example. Subsequent population studies have disclosed the prevalence and penetrance of these genes in more general populations and have provided realistic estimates of when to screen for the genetic variation. The abnormality encoded by these genes is being investigated and could lead to behavioral interventions to modify the risk of breast cancer.
Prevention research exemplifies cross-institute collaboration. Several personal and environmental risks affect development of more than one disease, and there may be beneficial as well as adverse effects. The use of hormonal replacement by menopausal women can have beneficial effects on cardiovascular disease, osteoporosis, and mental acuity, in addition to the aesthetic effects for which they are commonly taken. However, this therapy also poses risks for breast cancer and cancer of the uterus. To quantify the benefits and risks of hormonal replacement therapy for this range of clinical conditions, a large clinical trial is in progress utilizing the scientific expertise of several institutes and dependant on scientists at academic institutions with a range of specialty expertise in the conditions being studied. The planning, conduct, and monitoring of this large trial has required the participation of epidemiologists, biostatisticians, clinical trialists, and community organizers.
A description of the institutes and offices, their missions, and recent accomplishments are available at the NIH web site at http://www.nih.gov/. A list of all currently funded grants and contracts is available at http://www-commons.cit.nih.gov/crisp/, including an abstract describing the research project or program. A special web site containing all NIH-supported clinical trials is available at http://clinicaltrials.gov/. This site provides information to patients and referring physicians regarding available clinical trials.
(SEE ALSO: Centers for Disease Control and Prevention; Healthy People 2010)
Bibliography
Mullan, F. (1989). Plagues and Politics: The Story of the United States Public Health Service. New York: Basic Books.
National Institutes of Health. NIH Almanac. Washington, DC: U.S. Department of Health and Human Services. Published annually. Available online at http://www.nih.gov/about/almanac/index.html.
Shorter, E. (1987). The Health Century. New York: Doubleday.
Swain, D. C. (1962). "The Rise of a Research Empire: NIH, 1930–1950." Science 138:1233–1237.
— WILLIAM R. HARLAN