4. Patients must have no other malignancies. Patients with prior history of any in situ cancer, lobular carcinoma of the breast in situ, cervical cancer in situ, atypical melanocytic hyperplasia or Clark I melanoma in situ or basal or squamous skin cancer are eligible. Patients with other malignancies are eligible, if they have been continuously disease-free for 5 years prior to the time of study entry.