- History of cancer. However, patients with the following cancers will be considered eligible for the study: 1) superficial basal or squamous cell carcinoma of the skin which has been completely resected; 2) other malignancies completely treated without recurrence or treatment in the last 5 years, with the following exceptions: patients with a history of breast cancer (including histologic diagnosis of lobular carcinoma in situ), endometrial carcinoma, or other known or suspected estrogen-sensitive neoplasia are excluded regardless of time since treatment or disease status