ERCC1 and lung cancer: We further examined if the variable sensitivity to cisplatinum observed in CAFs from lung cancer could be attributed to functional polymorphisms in genes critical for cellular response to cisplatinum such as TP53, ERCC1, and Mdm2. It has been shown that cells with the TP53 Arg/Arg genotype induce apoptosis significantly better than with Pro/Pro genotype [34,35].