The typical diagnostic workup for CNS lymphoma consists of CSF analysis for markers such asIL-10,CXCL13,CD19, CD20 or flow cytometry (Baraniskinet al., 2011;Baraniskin & Schroers, 2014;Muñizet al., 2014;Rubensteinet al., 2013). The gene discussed is CXCL13; the disease is primary central nervous system lymphoma.