SMARCB1 and squamous cell carcinoma: Neves-Silva et al. retrospectively investigated the deficit of SMARCB1 in 643 cases of squamous cell carcinoma of the head and neck except the sinonasal region and reported that a deficit of SMARCB1 was found in four cases, and the onset sites were the lower lip, soft palate, hypopharynx, and vocal cords [15].