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Cisplatin resistant HNSCC cells are sensitive to BAY and YC-1. UM1-CisR and CAL27-CisR cells and their parental lines were treated with increasing doses of cisplatin (A), YC-1 (B) or BAY (C) for 72h. Cell viability was determined by MTT assay. Each value is a mean±SEM of 6 replicates.