A panel of miRNAs, miR-193a-3p, miR-210-3p, and miR-5100, in hypoxic bone-marrow stem-cell-derived exosome promotes lung cancer metastasis via STAT-3 induced EMT, which may be a candidate biomarker for cancer metastasis (Zhang et al., 2019). Here, STAT3 is linked to lung carcinoma.