STAT3 and squamous cell carcinoma: In the current study, we investigated the effect of resveratrol and its two 4′-methylthio-trans-stilbene derivatives (3-M-4′-MTS; S2) (3,5-DM-4′′-MTS; S5) on EGFR and Stat3 activation in human immortalized HaCaT keratinocytes and epidermoid carcinoma A431 cells.