Dibromodulcitol and adriamycin +/- tamoxifen in advanced breast cancer.

The therapeutic effectiveness of combining tamoxifen with a combination chemotherapy regimen was tested in 135 patients with advanced breast cancer previously treated with chemotherapy. Patients were randomly allocated to received dibromodulcitol + Adriamycin (DA, 55 patients) or DA + tamoxifen (DAT, 67 patients). An additional 13 patients less than 50 years of age were assigned to DAT (DATN). Pretreatment characteristics were similar across both regimens. DAT and DATN yielded similar results in the less than 50-year-old cohort. DAT tended to be superior to DA with respect to response rate (55% versus 36%, p = 0.004), time to treatment failure (medians: 170 days versus 110 days, log rank p = 0.001), responders' time to treatment failure (360 days versus 220 days, p = 0.035), and survival (340 days versus 270 days, p = 0.18). Toxicity was similar in both regimens. Thus, addition of tamoxifen to a second-line DA regimen appears to increase the therapeutic effectiveness. It is suggested that the addition of this antiestrogen to other chemotherapy regimens would also be beneficial.