Evaluation of intraoperative radiotherapy for carcinoma of the pancreas: prognostic factors and survival analyses.
Among 145 patients with carcinoma of the pancreas who had been admitted to three institutions between 1976 and 1985, 117 were entered into a prognostic factor analysis system according to Cox's proportional hazards model. The treatment was classified into four modalities: bypass surgery, single-dose intraoperative radiotherapy (IOR), IOR combined with external irradiation, and resection with or without various radiations. The most important prognostic factors for treatment were identified as location of tumor, TNM stage, and relief of back pain. Adjusting the imbalances among the treatment groups using Cox's model, the superiority of IOR with external irradiation was confirmed for both bypass and single-dose IOR. With this adjustment, the survival rates proved to be more meaningful than the simple Kaplan-Meier estimates.
D000230:Adenocarcinoma / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery; D000368:Aged; D005260:Female; D006801:Humans; D007430:Intraoperative Care; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000401:mortality / Q000532:radiotherapy* / Q000601:surgery; D011379:Prognosis; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D012044:Regression Analysis