IRF1 and cancer: The functions of miR‐502‐5p in several types of cancers have been examined, and several genes directly targeted by miR‐502‐5p, such as TRAF2, IRF‐1, SET8 and TP53, have been found.16, 19, 29, 30 Most studies suggest that miR‐502‐5p is a tumour‐inhibiting factor that enhances apoptosis and inhibits the proliferation of tumour cells.