Lnc‐PCAT1 was increased in MM patients than in health donors (p < 0.001), and receiver operating characteristic (ROC) curve showed that lnc‐PCAT1 had excellent capability of discriminating MM patients from health donors (area under curve: 0.932, 95% confidence interval: 0.889–0.976). Here, PCAT1 is linked to Miyoshi myopathy.