[4 malignant colo-rectal and peritoneal tumors appearing after pelvic irradiation].

Research on possible effects of ionizing radiations:study of four patients having developed malignant tumor after radiotherapy for primary cancer of female reproductive system: adenoacanthoma and adenocarcinoma of uterine corpus, squamous cell carcinoma of uterine cervix, right ovary adenocarcinoma. Our observations comprise three epithelial tumors (muciparus adenocarcinoma of caecum and sigmoid colon, squamous cell carcinoma of rectum and anal canal) respectively 17, 10 and 9 years after radiotherapy, and one mesenchymatous tumor (peritoneal fibrosarcoma) 4 years after radiotherapy.