Preliminary research on the evaluation of some prognostic factors in a randomized study of adjuvant immunochemotherapy in colorectal adenocarcinoma.

In a randomized, multicenter study, 168 evaluable patients with colorectal adenocarcinoma at B2, C1 or C2 stages of the Dukes, Astler and Coller classification, were treated after radical surgery with BCG and 5-fluorouracil alone (regimen A) or in combination with hydroxyurea, methyl-CCNU and mitomycin C (regimen B). Radiation therapy was mandatory after surgery for rectal cancer. Response to therapy was evaluated for length of disease-free interval after surgery and was analyzed in comparison to the data obtained upon entrance to the study. The results are reported as life curves of the duration of the disease-free interval for treatment in comparison to the presence or absence of various signs or symptoms of disease. Also reported are responses obtained using the Cox method for linear regression analysis on non-parametric data, that gave information on the importance of various prognostic factors.