Comparisons between NK cells cultured alone and those cultured with normal pancreatic hTERT-HPNE cells or pancreatic cancer BxPc-3 and SW1990 cells. (A and B) The percentages of surface receptor-positive and cytotoxic granule-positive NK cells harvested from the different NK cell-pancreatic cell cultures. (C–
I) Comparisons between the percentages of positive NK cells in the different culture groups. All experiments were repeated three times. All data were expressed as mean ± SD. Independent t-tests were used for statistical analysis through SPSS 19.0 software. *represents P <0.05, **represents P <0.01, and ***represents P <0.001.