MSLN and axial length measurement: GM levels of SMRP were slightly lower in AL patients (2.42 nM, 95% CL = 1.74–3.36 vs. 2.81 nM, 95% CL = 2.03–3.88); the imbalance was mainly due to differences between non-epithelioid PM patients (1.43 nM, 95% CL = 0.76–7.70 vs. 3.81 nM, 95% CL = 1.92–7.56).