PCAT1 and Miyoshi myopathy: In this study, we aimed to explore the correlation of lnc‐PCAT1 with MM risk, clinical characteristics, and prognosis, which observed that (1) lnc‐PCAT1 expression was increased in the MM patients; (2) lnc‐PCAT1 expression was correlated with bone lesion, higher β2‐MG, LDH, and presence of Del (17p) in MM; meanwhile, lnc‐PCAT1 expression was associated with poor prognostic risk stratification, including ISS stage and R‐ISS stage; and (3) baseline lnc‐PCAT1 high expression and its longitude increase during treatment were correlated with worse CR, PFS and OS.