TGFB1 and breast cancer: Recent studies have shown an association between increased miR‐34b‐3p expression and early fibrosis in HBV‐infected liver disease.15 miR‐34b‐3p is down‐regulated in small‐cell lung cancer and is a candidate antitumour miRNA.11 MicroRNA‐34b potently inhibited migration and invasion in metastatic prostate cancer cells by regulating the TGF‐β pathway.12 MicroRNA‐34b acted as a tumour suppressor in the oestrogen‐dependent growth of breast cancer cells.13 These findings prompted us to investigate the function and regulatory mechanism of miR‐34b‐3p in NSCLC cells.