AXL and colorectal cancer: For example, miR-34a regulates AXL expression in lung as well as in head and neck cancer cells, where high tumor AXL mRNA expression associates with poor survival [27, 30]; miR-34a and miR-199a reduce the expression of AXL in non-small-cell lung cancer and colorectal cancer cell lines [28]; and miR-92b reduces the amount of AXL in fibroblasts [29, 31].