CXCL10 and tropical spastic paraparesis: As shown in Figure 1 (left), the levels of CXCL10, neopterin, total protein, and anti-HTLV-1 antibody in CSF of HAM/TSP patients who received steroid therapy were significantly reduced 2 weeks after treatment, compared with the pre-treatment levels (p = 0.0005, p = 0.0005, p = 0.0059, and p = 0.0078, respectively).