KLRD1 and neoplasm: Tumour-specific expression of the NK receptors NCAM1, IL2RG, IL18R1, CXCR3, KIR2DL4, KLRD1, NCR1, KIT, CD7, CD2, and CD226 showed a positive correlation with the infiltrating CD56bright NK subset, but not with CD56dim NK cells (Figure 2A).