The effects of concomitantly administered cisplatin and radiation were
evaluated in four recently established endometrial adenocarcinoma cel
l lines. We used the 96-well clonogenic assay to obtain survival data
which were fitted to the linear quadratic model. The area under the su
rvival curve (AUG) was obtained by numerical integration. It turned ou
t that there was only a systematic additive cytotoxic effect and no su
pra-additive, true radiosensitising effect could be found. The results
were not affected by the cisplatin dose used, the intrinsic radiosens
itivity of the cell lines or the sensitivity of the cells to cisplatin
.