Neal D. Freedman, Ph.D., M.P.H.
|Organization:||National Cancer InstituteDivision of Cancer Epidemiology & Genetics, Metabolic Epidemiology Branch|
|Address:||NCI Shady GroveRoom 6E432|
Dr. Freedman received his Ph.D. in biomedical sciences from the University of California, San Francisco in 2004 and a Masters in Public Health from the Harvard School of Public Health in 2005. He subsequently joined the Nutritional Epidemiology Branch of the Division of Cancer Epidemiology and Genetics as a Cancer Prevention Fellow, becoming a tenure-track investigator in 2009. Dr. Freedman was awarded scientific tenure by NIH in 2015, and is DCEG's principal investigator for the Prostate, Lung, Colon, and Ovary (PLCO) Cohort Study. He draws on his training in molecular biology and epidemiology to investigate the roles of tobacco, diet, and metabolic hormones in cancer risk.
It has long been known that tobacco causes many different types of cancer. Yet, the tobacco epidemic has changed substantially over the past 50 years. Thankfully, with concerted tobacco cessation and prevention efforts, the prevalence of smoking has decreased in the United States. Still, nearly 20% of Americans continue to smoke. In the past, more men smoked than women, and started smoking earlier, but currently similar proportions of men and women smoke, and they typically start smoking at similar ages. There have also been many changes in the design and construction of cigarettes. New and emerging tobacco products are also gaining popularity, including dissolvables, electronic cigarettes, and water pipes; yet whether these products affect health is unclear. We are working to determine whether changes in the tobacco epidemic may affect disease risk.
Liver cancer is sixth in cancer incidence and third in cancer mortality worldwide. Strong risk factors have been identified including aflatoxin, alcohol, and chronic hepatitis B and C infection, but data from several case series suggest that a substantial proportion of liver cancer cases in the United States lack these exposures. The liver is a major metabolic organ, important for the regulation of fatty acid, insulin, and glucose signaling. Diabetes and adiposity are consistent risk factors for liver cancer, suggesting an important role for energy balance. Diet may also be important, with proposed associations for coffee, red and white meat, fats, sugars, fruits and vegetables, and micronutrients. We are investigating associations of dietary and environmental exposures with liver cancer.
The gastrointestinal tract is the largest endocrine organ in the body. Although gastrointestinal and metabolic hormones play critical physiological roles, whether these hormones contribute to cancer risk has received little attention. We are investigating the role of these hormones and gastrointestinal conditions in cancer using large prospective datasets including the ATBC, NIT, and NIH-AARP cohorts, as well as SEER-Medicare.