TNFRSF11B and axial length measurement: The most important finding of our study was the correlation of the aforementioned elevated OPG levels with AL patients' survival: OPG levels, either >8 pmol/l (the upper limit of healthy controls) or >16.3 pmol/l (the 75th quartile of AL patients), were able to identify three groups of patients with different median OS: 12, 47, and 91 months, respectively (Figure 3c).