Cell viability did not change in the UV20ERCC1_C and UV20ERCC1_T cell lines. The parental cell line UV20, empty vector transfected control cell line, and ERCC1 cDNA with either allele of 500 C>T transfected cell line UV20ERCC1_C and UV20ERCC1_T were treated with cisplatin (0, 2.56×10−6, 6.40×10−5, 3.2×10−4, 1.6×10−3, 8×10−2, 4×10−2, 0.2 µg/µl), carboplatin (0, 3.2×10−4, 1.6×10−3, 8×10−2, 4×10−2, 0.2 and 1.00 µg/µl) and oxaliplatin (0, 3.2×10−4, 1.6×10−3, 8×10−2, 4×10−2, 0.2 and 1.00 µg/µl). The cell cytotoxicity was tested by CCK-8 and CellTiter-Blue assayes. Only the results from CCK-8 assay for carboplatin and oxaliplatin are shown. Data are mean ± SD obtained from three independent experiments with triplicates in each experiment.