NCAM1 and neoplasm: The peripheral NK (pNK) cells in the normal region were CD56+CD16bright that lacked full cytotoxic ability, while tumor-infiltrated NK (TiNK) cells were CD56+CD16dim-neg cells, a phenotype of decidua NK (dNK) cells, that exhibited possibility of conversion from pNK cells and increasing angiogenic and inflammatory genes with enrichment of genes in the HIF-1α pathway (Guan et al., 2020).