FOXP3 and adult T-cell leukemia/lymphoma: The mean FOXP3 gene expression in ATLL was around 28 times more than that in ACs (41.02 ± 24.2 vs. 1.44 ± 1; P = 0.007) and 91 times more than HAM/TSP patients (41.02 ± 24.2 vs. 0.45 ± 0.15; P = 0.01).