KLRK1 and familial pancreatic carcinoma: In the present study, results suggested that 1 mM VPA did not inhibit the proliferation of pancreatic cancer cells (Additional file 4: Figure S3), but it enhanced NK cell-mediated lysis of pancreatic cancer cells, which relies on a NKG2D/NKG2DL-dependent interaction between NK cells and pancreatic cancer cells.