Standard or Comprehensive Radiation Therapy in Treating Patients With Early-Stage Breast Cancer Previously Treated With Chemotherapy and Surgery

Cisplatin, Carboplatin and Etoposide or Temozolomide and Capecitabine in Treating Patients With Neuroendocrine Carcinoma of the Gastrointestinal Tract or Pancreas That Is Metastatic or Cannot Be Removed by Surgery

Androgen-Deprivation Therapy and Radiation Therapy in Treating Patients With Prostate Cancer

Durvalumab and Tremelimumab in Treating Patients With Recurrent Stage IV Lung Cancer