ABCB1 and head and neck squamous cell carcinoma: This evaluation indicated that HNSCC patients with cisplatin resistance and low survival were associated with the high MDR1 and MRP1 expressions by their tumor biopsy, but were not associated with ATP7B and MRP2 expressions (41), which highlights the critical roles of MDR1 and MRP1 in cisplatin resistance (Figure 2B; Table 1).