CXCL10 and tropical spastic paraparesis: However, increasing CXCL10 levels in the CSF of HAM/TSP patients were associated with elevated CSF cells counts (Figure 7B, Spearman R = 0.468, p = 0.033), higher pNfH levels (Figure 7C, Spearman R = 0.547, p = 0.010), elevated neopterin in the CSF (Figure 7D, Spearman R = 0.710, p < 0.001), and increased neopterinCSF/serum ratio (Figure 7E, Spearman R = 0.473, p = 0.030).