[Effect of combined treatment with cisplatin and radiation on the survival of Chinese hamster cells].

During combined treatment of Chinese hamster cells with cisplatinum and irradiation under aerobic conditions, there appear interactions between the two treatment modalities depending on the treatment sequence and the time interval. Treatment with cisplatinum followed by irradiation leads to a reduction of the shoulder of the survival curve with increasing time interval. Simultaneous treatment with cisplatinum and irradiation under aerobic or hypoxic conditions does not change the survival curve. Treatment with cisplatinum under aerobic conditions followed by irradiation in hypoxia does not lead to any interaction of both modalities independent of the time interval in contrast to subsequent irradiation under aerobic conditions. The specific sensitization of hypoxic cells by cisplatinum towards irradiation described in the literature could not be demonstrated with our cell line.