STAT3 and head and neck cancer: The observation that pre‐ or simultaneous co‐application of curcumin with acidic bile exerts a more significant effect on inhibition of Stat3, a head and neck cancer‐related transcriptional factor,29, 37, 42 than its post‐application, further supports the view that curcumin successfully blocks early cancer‐related effects of acidic bile on HM.