In our study, subgroup analysis suggested that upregulation of MALAT1, TCF7, NEAT1, and PVT1 were associated with poor OS (p < 0.05), high expression of PVT1, and TCF7 resulted in worse PFS (p < 0.05), while only overexpression of TCF7 was correlated with poor EFS (p < 0.05), indicating the predictive ability of particular lncRNAs in predicting prognosis of MM. The gene discussed is MALAT1; the disease is Miyoshi myopathy.