P-ERK1/2, T-ERK1/2, P-STAT3 (Tyr705), P-STA3 (Ser 727), and T-STAT3 protein levels were analyzed in (A) FaDu-TP63 shRNA3 cells or (B) CAL27-TP63 shRNA3 cells treated with DMSO (vehicle) or 10 μM Trametinib by western blotting. (C-F) Effects of Trametinib treatment on migration of FaDu-TP63 shRNA3 and CAL27-TP63 shRNA3 cells were measured using scratch assay, and the percentage closure was quantified (two-tailed unpaired Student t-test, **: P < 0.01; Mean ± SD). (G, H) Effects of Trametinib treatment on invasion of FaDu-TP63 shRNA3 and CAL27-TP63 shRNA3 cells was measured using matrigel-coated transwell inserts, and the number of cells invaded/field was quantified (two-tailed unpaired Student t-test, **: P < 0.01; Mean ± SD).