MMP9 and colorectal cancer: The median protein level of MMP-2 and MMP-9 in the normal mucosa of the 198 colorectal cancer patients was 4.8 ng mg−1 protein (range, 0–30.5) for MMP-2 and 3.2 ng mg−1 protein (range, 0.2–164.7) for MMP-9.