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Background To investigate thymidine kinase 1(TK-1) and Ki67 expression levels of human colorectal carcinoma cells line SW480 after exposure to a simulated laparoscopic carbon dioxide (CO2) pneumoperitoneum environment at different pressures and lengths of exposure time. Methods The effects of the simulated laparoscopic CO2 pneumoperitoneum environment at different CO2 pressures (6, 9, 12, and 15 mmHg)...
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