CXCL12 and Myelopathy: For CXCL12, ROC analysis indicated an AUC value of 0.99 ± 0.005 (95% CI 0.98–1.00, P = 0.000) for myelopathies, with the optimal cut-off at 451.1 pg/mL determined by the Youden index (0.95; sensitivity of 100%; specificity of 95.7%; Fig. 1D).