CD44 and oral cavity squamous cell carcinoma: The following keywords were used: "CD24," "CD44," "oral squamous cell carcinoma," and "OSCC." The following search strategy was constructed: ((((((oral squamous cell carcinoma[Title/Abstract]) OR (oral squamous cell carcinoma[MeSH Terms])) OR (OSCC[Title/Abstract])) OR (OSCC[MeSH Terms])) OR (OSCC[MeSH Terms])) AND ((CD24[Title/Abstract]) OR (CD24[MeSH Terms]))) AND ((CD44[Title/Abstract]) OR (CD44[MeSH Terms])).