KLRK1 and ovarian cancer: In the present study, we demonstrated the potent susceptibility of specific epithelial ovarian tumor cells, HTB75 and OVCAR3, to Vγ9Vδ2 T-cell treatment alone induced cytotoxicity, whereas treatment of Vγ9Vδ2 T cells combined with pamidronate (PAM; a kind of NBP) showed significantly enhanced cytotoxicity activities towards all types of ovarian cancer cells in vitro due to the induction of NKG2D ligands following treatment with PAM.