- Female patients must have histologically confirmed (tumor tissue biopsy) primary clinical stage IB2-IVB cervical cancer or clinical stage II-IVB vaginal cancer not amenable to curative surgical resection alone to be eligible; patients with stage IVB cervical cancer may receive systemic chemotherapy for treatment of metastatic disease a) after the 3-month post-therapy PET scan and b) if the 3-month post-therapy PET scan documents progressive disease at the discretion of the treating physician