B3GAT1 and leukemia: About 85% of LGL leukaemias are derived from a T cell lineage (T-LGL leukaemic cells express CD3, CD8, CD16, and CD57), while the rest are derived from the natural killer (NK) cell lineage (NK-LGL leukaemic cells express CD2, CD16, CD56, and CD57) [6, 7].