T-Cell Project: Epidemiologic Component

Background: * The T-Cell Project, sponsored by the International T-cell non-Hodgkin Lymphoma Study Group, is a consortium of institutions interested in achieving more detailed information on clinical and biological characteristics of T-cell lymphomas. * The T-Cell Project serves as a repository for data on patients with peripheral T-cell lymphoma (PTCL) worldwide. Its overall goal is to improve T-cell subtype classifications and evaluate treatment strategies for each subtype. Objectives: -To implement a standardized epidemiologic questionnaire into the ongoing T-Cell Project to allow evaluation of various potential risk factors for PTLCs. Eligibility: -Untreated patients 18 years of age and older who were diagnosed with PTLC September 1, 2006, or later. Design: -Patients complete a questionnaire containing the following information: Demographic information Smoking history and alcohol use Personal history or cancer History of cancer among first-degree relatives Medical history History of transplants History of blood transfusions Medication use Occupational and residential history Pesticide treatment -The information collected is linked to clinical and pathologic information in the T-Cell Project database.