\- Treatment by IMRT: Radiotherapy Modalities. All volumes will receive a base dose of 45 Gy in 25 fractions or 46 Gy in 23 fractions, followed by additional irradiation doses that vary depending on the type of tumor. The treatment will be carried out in one or more phases.
* Patient follow-up:
this will take place at 3 months, 6 months, 12 months, and 18 months after the end of irradiation for cervical and anal canal cancers, and extended to 24, 30, and 36 months, then at 4 and 5 years for prostate cancers, with an evaluation of the treatment's effectiveness and tolerance.
* Collection of economic and clinical information: Medical data concerning the patient, their disease, and treatment-related toxicity will be collected during the treatment and afterward. The economic study will include measuring the duration of the different stages of preparation and treatment.
