BTK and adenoid cystic carcinoma: Moreover, subdivision of head and neck tumors into adenoid-cystic carcinomas (ACC), squamous cell carcinomas (SCC), and others showed that BTK-p80 expression is a characteristic feature of SCC, given the 65.4% of specimens expressing BTK at a medium or high level (Figure 1B), whereas BTK-p65 is more highly expressed in ACCs and other head and neck carcinomas.