Effects of simulated carbon dioxide and helium peumoperitoneum on proliferation and apoptosis of gastric cancer cells

Table 4 Changes of MKN-45 proliferative viability in helium groups (OD, mean± SD)

Groups	Time (d)
	1	2	3	4	5	6	7
Control	0.29 ± 0.04	0.36 ± 0.04	0.58 ± 0.03	1.22 ± 0.05	1.83 ± 0.03	2.21 ± 0.04	2.62 ± 0.04
0 mmHg	0.30 ± 0.02	0.39 ± 0.02	0.60 ± 0.04	1.23 ± 0.06	1.86 ± 0.06	2.37 ± 0.05	2.64 ± 0.05
5 mmHg	0.30 ± 0.02	0.38 ± 0.03	0.58 ± 0.03	1.27 ± 0.05	1.80 ± 0.08	2.40 ± 0.33	2.75 ± 0.12
10 mmHg	0.31 ± 0.03	0.41 ± 0.03	0.57 ± 0.05	1.25 ± 0.06	1.78 ± 0.04	2.49 ± 0.26	2.71 ± 0.18
15 mmHg	0.33 ± 0.02	0.39 ± 0.04	0.54 ± 0.09	1.24 ± 0.23	1.81 ± 0.09	2.31 ± 0.20	2.73 ± 0.11

OD: Optical density.