- Anticancer chemotherapy or immunotherapy within 4 weeks of study entry. Mitomycin C or nitrosoureas should not be given within 6 weeks of study entry. Anticancer therapy is defined as any agent or combination of agents with clinically proven anti tumor activity administered by any route with the purpose of affecting the malignancy, either directly or indirectly, including palliative and therapeutic endpoints. Accepted exceptions are bisphosphonates, Luteinizing hormone-releasing hormone (LHRH) agonists for prostate cancer, and mitotane for adrenal carcinoma.