- Prior or concurrent malignancies; patients who have had a previous diagnosis of cancer, if they remain free of recurrence and metastases five years or more following the end of treatment and, in the opinion of the treating physician do not have a substantial risk of recurrence of the prior malignancy, are eligible for the study; patients who have been adequately treated for non-melanomatous skin cancer or carcinoma in situ of the cervix are eligible irrespective of when that treatment was given