STAT3 and cancer: It has been shown to affect several signal transduction pathways such as Wnt/β‐catenin, mechanistic target of rapamycin (mTOR) complex 1 (mTORC1), signal transducer and activator of transcription 3 (STAT3), nuclear factor kappa‐light‐chain‐enhancer of activated B cells (nuclear factor‐κB; NF‐κB) and Notch pathways, all indicating its potential to treat conditions such as cancer (summarized in Table 1), chronic medical diseases, and bacterial and viral infections.