PROTOCOL ENTRY CRITERIA:

--Disease Characteristics-- Diagnosis of breast cancer or ductal carcinoma in situ at age 45 or under OR Diagnosis of ovarian cancer at age 50 or under OR Diagnosis of breast cancer with bilateral disease or multiple primaries or breast cancer and ovarian cancer in the same individual OR Diagnosis of breast or ovarian cancer AND At least one first or second degree relative with breast cancer diagnosed at age 45 or under or ovarian cancer at age 50 or under OR Three relatives in the same lineage with breast or ovarian cancer where each affected individual is a first or second degree relative to another of the affected individuals OR First or second degree male relative with breast cancer diagnosed at any age OR Women of Ashkenazi Jewish descent who meets any of the above criteria with specified ages of onset of 50 for breast cancer and any age for ovarian cancer OR Male with breast cancer diagnosed at any age OR Documented BRCA mutation in the family Hormone receptor status: Not specified --Prior/Concurrent Therapy-- Not specified --Patient Characteristics-- Age: 18 and over Sex: Male or female Menopausal status: Not specified Performance status: Not specified Life expectancy: Not specified Hematopoietic: Not specified Hepatic: Not specified Renal: Not specified Other: No psychological disorder that may preclude study