Table 3.

Comparison of the NK Cells Activities in the Blood Across Different Pathological Stages at Day 1 Before Surgery or at Day 7 After Surgery.^a

Surgery status	Dukes A	Dukes B	Dukes C	P Value by Chi-square Test
Before laparoscopic	50.4	29.6	32.1	.769
After laparoscopic	52.1	30.2	33.2
Before open surgery	47.3	31.6	30.4	.0124
After open surgery	49.1	24.7	23.4

Abbreviation: NK cells, natural killer cells.

^a The data were presented as mean values (LU₃₅ as described in the Methods section) for each group of patients; P value was analyzed by chi-square test within the same surgery groups.