In this case-control study, persons with a recent diagnosis (within 4 months) of a primary brain tumor will be identified in the neurology/neurosurgery clinics at major treatment referral centers in the Southeast. Non-blood related relatives (eg. in-laws), friends or other persons will be recruited as controls. Names and contact information of eligible controls will be ascertained from patients. A total of 1,500 cases and 3,000 controls will be enrolled over the course of the 5-year study. All enrolled subjects will complete a one hour interview on lifestyle, environmental exposures, diet, physical activity, tobacco use and medical history. They will also be asked to provide a DNA sample, a water sample and a toenail sample (from each great toe). At the end of data collection, lifestyles and genetic attributes will be compared in cases and controls to identify any differences that may be relevant to the causation of disease. Because the study will recruit patients near the time of disease diagnosis, full enrollment should be possible. In addition, high re-sponse rates are anticipated among the controls. Thus, with the large numbers of patients available and high anticipated response rates, the study offers a unique opportunity to successfully identify environmental and genetic risk factors for this uncommon form of cancer.