CXCL13 and myeloid sarcoma: When comparing cytokine/chemokine protein levels, we found higher CSF levels of IL-10, TNF-α, and CXCL13 in MS-ON than in ION (IL-10, respectively, 0.27 [0.11–1.26] vs 0.083 [0.043–0.12] pg/ml, q = 0.004, TNF-α 0.37 [0.21–0.43] vs 0.16 [0.13–0.24] pg/ml, q = 0.021, and CXCL13 28.9 [10–75.4] vs 10 [10] pg/ml, q = 0.0006; Fig. 2a).