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Cisplatin EC50 values for HNSCC cell lines in vitro. Cell proliferation assay at 72 h to determine EC50 values for cisplatin in the (A) indicated cell lines and (C and D) cisplatin resistant HN30-R8 and HN31-P10. Representative graphs from one experiment are shown. (B and E) Table indicating average EC50 value. Statistical significance was calculated using Student’s t-test. *p < 0.05
