Molecular Basis for Variations in Hereditary Colorectal Cancer Syndromes

"Consenting Proband Group: Participants fill out questionnaires about work, family history, medical history, and health habits at baseline. It should take about 20 minutes to complete the questionnaires. Participants also complete a health and lifestyle questionnaire, which contains 20 questions for men and 22 questions for women. Questionnaire should take about 10 minutes to complete. Follow-up questionnaire at least 1 time in 5 years to update medical, cancer, and family history.~Family Members (MDA Registered Patients) Group and Family Members (Not MDA Registered Patients) Group: Participants complete a health questionnaire, which collects information about their personal medical history, demographics (age, race, sex, and so on), and questions about their alcohol and tobacco use at baseline. Questionnaire should take about 20 minutes to complete. Participants complete follow-up questionnaire at least 1 time in 5 years to update their medical, cancer, and family history."

About 2-3 tablespoons blood drawn. Participants may give a saliva sample instead.