ALCAM and head and neck squamous cell carcinoma: The ALCAM gene overexpression association with prognosis was exclusive for LSCC in the HNSCC TCGA data, and was not observed either when all HNSCC samples were analyzed together (p = 0.97), or according to other specific sites (oral cavity (OCSCC), p = 0.34; and oropharyngeal (OPSCC), p = 0.36) (Figure 2B–D).