KRT5 and oral cavity neoplasm: In conclusion, CK5 was expressed in all of the types of squamocellular carcinoma that were included in the present study, with scores varying from 1 to 3 and a higher expression observed in the poorly-differentiated carcinomas as follows: A score of 3 for those originating from the jaw, 2 for the one originating from the gingival sulcus, and 1 for carcinomas of the tongue and submandibular area.