In addition, we analyzed TCR β repertoires of HTLV-1 Tax11-19–specific CD8+ T cells from PBMCs of HLA-A*0201+ HAM/TSP patients and identified that the expanded TCR clones in HTLV-1 Tax11-19–specific CD8+ T cells were also expanded and enriched in the CSF of HAM/TSP. The gene discussed is CD8A; the disease is tropical spastic paraparesis.