Vegan activists have long maintained that eating meat causes colorectal cancer. However, there was never much research to back up that claim (but that didn't stop the claim from being trumpeted throughout the media). Now a new empirical population study with a control group concludes, "Our data do not support the hypothesis that meat consumption is a risk factor for CRC [colorectal cancer]."
Remember, observational studies are good for generating hypotheses, but not for showing causality. But this particular study does not show any support for the eating-meat-causes-colorectal-cancer hypothesis.