CD44 and breast carcinoma: Further enrichment analysis of CD44 with Kyoto Encyclopedia of Genes and Genomes (KEEG) and Hallmark gene sets in breast cancer and melanoma cohorts from TCGA showed that CD44 was involved in the following immune-related pathways in melanoma: antigen processing and presentation; B cell receptor signaling pathway; T cell receptor signaling pathway; and IFNγ response.