In PTC, the circPSD3/miR-637/HEMGN axis promotes the proliferation, migration, and cell cycle progression of PTC cell lines, and inhibits apoptosis [12]; in addition, the circHIPK3/miR-637/AKT1 axis in GC [17], the circHIPK3/miR-637/NUPR1 axis in OSCC [35], and the circHIPK3/miR-637/STAT3 axis in SaOS [31] are associated with cancer progression. Here, STAT3 is linked to cancer.