TGFB1 and lip and oral cavity carcinoma: The keywords used for searching were: ‘(TGF-β) AND (oral squamous cell carcinomas)’, ‘(TGF-β) AND (salivary adenoid cystic carcinomas)’, ‘(TGF-β) and (keratocystic odontogenic tumors)’, ‘(TGF-β) and (oral cancer therapy)’ and ‘(TGF-β) and (oral cancer)’.