Important NKp30 ligands are the B-7 family member B7-H6, absent on healthy cells but highly expressed by a wide range of tumor cells [107], and HLA-B-associated transcript 3 (BAT3), also known as Bcl2-associated athanogene 6 (BAG6), which can be released by tumor cells inducing either NK cell activation or suppression [108,109]. This evidence concerns the gene PPIB and neoplasm.