Stages IB3, IIA2, IIB, III, and IVA The standard therapy for stages IB3, IIA2, IIB, III, and IVA cancer is External pelvic radiation therapy with brachytherapy and concurrent platinum-based chemotherapy To determine the extent of the radiation field, clinicians may evaluate spread to para-aortic lymph nodes clinically (abdominal CT and / or MRI) or surgically (pelvic and para-aortic lymphadenectomy).