FDG Tumor Heterogeneity During Chemoradiation as a Predictor of Response in Patients With Cervical Cancer

Inclusion Criteria: * Patient must have biopsy-proven cervical cancer (FIGO stage-Ib2-IVb). * Patient must be at least18 years of age. * Patient must be planning to receive chemoradiation therapy with cisplatin. * Patient must have non-pregnant status if a female of childbearing potential. Women who have had a tubal ligation at least 12 months prior to study entry or a hysterectomy will be considered NOT of childbearing potential. Postmenopausal women must have been amenorrheic for at least 12 consecutive months to be considered NOT of childbearing potential. * Patient may have distant metastatic disease provided the estimated survival is at least 1 year. * Patient's tumor(s) must be FDG avid on baseline standard of care FDG-PET/CT or PET/MR imaging that was performed at Barnes-Jewish Hospital Clinical PET Facility. * Patient must be able and willing to give informed consent. * If the patient will be scanned on the PET/MR for the mid-treatment scan, they must be determined to be safe for exposure to the magnetic field. This will be determined the day of imaging by the technologist with the use of a screening form. If a patient is not safe for the PET/MR scanner, their mid-treatment images will occur on the PET/CT scanner in the Center for Clinical Imaging Research. Exclusion Criteria: * Patient must have no other active cancer at the time of diagnosis of cervical cancer. * Patient cannot have received treatment for any malignancy, with the exception of non-melanoma skin cancer, in the past 5 years. * Patient must not be an uncontrolled diabetic with a glucose of ≥ 200mg/dl at the time of PET imaging.