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Is there a bias against open surgery for colorectal cancer?

Fahim et al. (1) report increased mortality after open colorectal cancer surgery (HR1.26). Is this conclusion validated by the presented data? The explanation of decision process regarding type of surgery is probably not sufficient, as at the end of the analysed period (2018) only 4% patients had open surgery. With such a low percentage of patients having open surgery comparison with laparoscopic surgery group is difficult.