Table 5: The cytotoxicity of VIP or antagonist in 1 × 10−6 mol/L, 1 × 10−5 mol/L concentration, respectively, on the growth of NK cells to MKN45 cells for 24 h, 48 h, or 72 h.

Time (h)n OD490
ABCDEF

2412
4812
7212

 * , compared with group F in same time. , compared with group E in same time. Group A: MKN45 + NK + VIP + antagonist; group B: MKN45 + NK + VIP; group C: MKN45 + antagonist; group D: MKN45 + VIP; group E: MKN45 + NK; and group F: MKN45 (control).