STAT3 expression can be significantly downregulated following transfection with the miR-337 mimic, which potentially targets the 3-UTR of STAT3.[36] MF progression can be estimated by analyzing the upregulated expression of miR-155, miR-146a, 146b-5p, miR-342–3p, and let-7i∗ and downregulated expression of miR-203 and miR-205.[37] Subsequent studies confirmed that miRNAs are potentially valuable tools for the evaluation of disease progression in MF.[38,39]. Here, STAT3 is linked to mycosis fungoides.