Among the 149 sinonasal carcinomas analyzed, SMARCB1 (INI1) expression was lost in 7 tumors (4.7%) (95% confidence interval: 1.7–10.3%), while none showed loss of SMARCA4 (BRG1) expression by immunohistochemical staining (0/149) (95% confidence interval: 0 to 4.6%). Here, SMARCB1 is linked to nasal cavity and paranasal sinus carcinoma.