Medico-economic Evaluation Comparing Intensity-Modulated Radiation Therapy (IMRT) Performed by Helical Tomotherapy and Dynamic Arc Therapy in Prostate, Cervical and Anal Canal Cancers

Inclusion Criteria: * WHO performance index ≤ 2 * Age \> 18 years * histologically proven carcinoma: Anal canal cancer locally advanced (\> 4 cm and / or N1 to N3) under irradiation on pelvic and inguinal lymph nodes with concurrent chemotherapy. The boost with brachytherapy are accepted Prostate cancer with pelvic lymph nodes and radiation or hormone therapy Cervical Cancer under a purely medical treatment involving irradiation on pelvic lymph nodes and primary tumor with concurrent chemotherapy without surgery. The Boost by external radiotherapy or brachytherapy are accepted. * The investigator must ensure that the patient has not expressed its opposition to participate in this study. The signing of a consent form is optional; Exclusion Criteria: * History of invasive cancer other than basal cell carcinomas. * Indication of re-irradiation * para-aortic radiotherapy associated with pelvic irradiation. * post-operative radiotherapy. * geographical distance