The expression of KMT2D in the ATLL cases was 0.5740 ± 0.05896 and in the normal control was 4.204 ± 0.1548, which shows a statistically significant lower expression in the ATLL patients than in the normal cases (P-value < 0.0001). Here, KMT2D is linked to adult T-cell leukemia/lymphoma.