HIF1A and colorectal carcinoma: Even though many earlier studies have described mir-181, mir-21, and mir-155 as direct targets of HIF-1α, we found reports that prove that these miRNAs also can be transcribed by NF-κB in CRC, which, in turn, can be positively regulated by HIF-1α during hypoxia and ischemia events, suggesting a key feedback loop that enhances cell proliferation and tumor growth [91,92,93].