PARP1 and lip and oral cavity carcinoma: PAC (3,5‐Bis (4‐hydroxy‐3‐methoxybenzylidene)‐N‐methyl‐4‐piperidone) is recently reported to reduce cell survival through promote apoptosis and autophagy by activating NF‐κB, MAPK, Wnt, caspase‐3/9 and PARP1 at the dose of 5 μM in oral cancer CA9‐22 cells.72