On the basis of a detailed analysis, the correlation between the number of treatments, the therapeutic and the side effects could be verified. In the course of dose reduction, there was no significant difference when comparing the results of therapy, however, the quality of life was better if cisplatin 30 mg/m(2) was administered instead of 40 mg/m(2). If cisplatin 20 mg/m(2) was given, the results were significantly worse. On the basis of the own results, it can be stated that the optimal weekly dose of cisplatin is 30 mg/m(2).