Antiandrogen Therapy, Abiraterone Acetate, and Prednisone With or Without Neutron Radiation Therapy in Treating Patients With Prostate Cancer

OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients receive ADT per standard of care. Beginning 2 months after start of ADT, patients also receive abiraterone acetate and prednisone per standard of care for at least 6 months in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive ADT, abiraterone acetate, and prednisone as in Arm I. Beginning 8‐10 weeks after starting ADT and within 1 week of starting abiraterone acetate, patients also undergo 3‐5 fractions of neutron radiation therapy for 2 weeks in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up every 4 weeks for 6 months.