PTK2 and Miyoshi myopathy: Besides, bioinformatics prediction disclosed that circ-PTK2 involved in MM pathogenesis by sponging its potential target microRNA (miR) -638, miR-4690, miR-6742, miR-6749 and miR-6775, among which miR-638 was especially known to be of critical value due to its correlation with MM-related signaling pathways, WNT/β-catenin pathway and MEK/ERK pathway (7–9).