SMAD3 and non-small cell lung carcinoma: However, TGF‐β stimulation could reverse miR‐133a effect on EMT and TGF‐β/Smad3 pathway in A549 cells, suggesting that TGF‐β/Smad3 pathway took part in NSCLC progression regulated by miR‐133a (P < 0.05, P < 0.01).