Related studies in other populations have also shown associations of HLA-B*07 and HLA-DRB1*01 with HAM/TSP in a Spanish population (14), HLA-DQB1*05 and HLA-DRB1*01 with HAM/TSP in an Iranian population (15), and HLA-C*07 with HAM/TSP in a Brazilian population (16). This evidence concerns the gene HLA-B and tropical spastic paraparesis.