GJA3 and lung adenocarcinoma: However, for selected miRNAs, miR-610 was found to suppress lung cancer cell proliferation and invasion by targeting GJA3 expression (Jin et al., 2014), while exosomal miR-7977 has been identified as a novel biomarker for patients with lung adenocarcinoma and may function as a tumor suppressor in lung cancer (Chen et al., 2020).