Stage IIIB TNM Any T, N3, M0 or T4, any N, M0 The tumor cannot be removed because of the structures it has invaded and because there would be no survival benefit to the patient. Standard Treatment These tumors are best managed with radiation therapy . Surgery has no benefit at this stage. Five-Year Survival Less than 5 percent Investigational • Trials are examining the effectiveness of chemotherapy combined with radiation therapy. These treatments are evaluating various drug combinations and sequences of administration in relation to radiotherapy .