The authors compared both therapeutic efficacy and toxicity of two different treatment regimens: ABC = adriamycin, nitrogen mustard (BCNU) and cyclophosphamide (CTX) vs. AC = adriamycin and cyclophosphamide in ovarian cancer. Thirty-one patients were entered under treatment plan ABC and 26 under treatment plan AC simultaneously. Therapeutic evaluation was subdivided into different risk groups (adjuvant therapy, residual disease less than or greater than 2 cm). A similar result could be noted in the two different treatment regimens. Toxicity was more severe and frequent in the group treated with BCNU. The AC regimen was preferred because of its lower incidence of side-effects and for its easier mode of administration.