B3GAT1 and T-cell large granular lymphocyte leukemia: The diagnostic workup of T-LGLL is based on the identification of a persistent T-LGLL peripheral expansion (> 0.5 × 109/L) with surface markers compatible predominantly with an activated T-cell phenotype (CD3+/CD8+/CD57+) and clonal rearrangement of T-cell receptor (TCR) gene [5].