The CSF results of one patient was inconsistent, with a negative FTA Abs for neurosyphilis, but with the other CSF tests indicating neurosyphilis (CSF CXCL13 level of 5600 pg/mL, 44 lymphocytes, 0.95 g/L protein, CXCL13 CSF to serum ratio of 614, serum RPR of 32). This evidence concerns the gene CXCL13 and neurosyphilis.