A lot of studies have demonstrated the prognostic value of post therapy 18F-FDG PET/CT in the management of uterine cervical cancer. Post therapy 18F-FDG PET/CT is usually requested by a lot of clinicians. Whereas 18F-FDG PET/CT is useful for prognosis in the follow-up, data are yet insufficient to clearly establish a formal recommendation. This prospective multicenter observational study will evaluate the interest of post therapy 18F-FDG PET/CT in clinical management (within 2 months of treatment) in patients with cervical cancer at an advanced stage. Main outcome : The therapeutic impact of post therapy 18F-FDG PET/CT (within 2 months after the end of therapy) will be evaluated on the complete results included MRI. Investigators will compare : * decision of clinicians without 18F-FDG PET/CT results * and decision of clinicians knowing entire results included results of 18F-FDG PET/CT.