A cis-platin + bleomycin combination, sometimes associated with a third cytostatic drug, was administered for prolonged periods to 1062 cancer patients previously subjected to a wide variety of treatments. The objective response rate was about 70% in localized squamous cell and anaplastic bronchial carcinoma and 40% in bronchial adenocarcinoma and metastatic squamous cell carcinoma. Cancers of the head and neck responded in 70% of the cases before irradiation and in 30% after irradiation. Other epidermoid tumours responded objectively in the proportion of 45%, as did 58% of metastatic and refractory breast cancers. These results were not clearly improved by any of the other cytostatic drugs used concomitantly, and the combination alone was less toxic. The high response rate obtained is attributed to a synergistic effect of cis-platin and bleomycin administered for prolonged periods.