PLP2 and Miyoshi myopathy: Based on the results of the univariate Cox proportional hazard regression analysis, LDH, β2-MG, and PLP2 expression (OS: HR = 3.250, 95% CI: 1.320-7.999, p = 0.010, Table 2; PFS: HR = 1.865, 95% CI: 1.031-3.375, p = 0.039, Table 3) were included in the multivariable Cox proportional hazard regression analysis, which indicated that the PLP2 expression was still an independent prognostic factor in terms of OS in 87 MM patients (HR = 2.598, 95% CI: 1.032-5.991, p = 0.041, Table 2).