Subsequent gene sequencing of other T cell leukemias/lymphomas revealed TET2 mutations at much lower frequencies compared to nodal TFH lymphomas – including 17% of T-cell prolymphocytic leukemia cases (30), 14-20% of acute T-cell leukemia/lymphoma cases (31, 32) and in 4-12% cases of cutaneous T cell lymphoma and/or Sezary syndrome cases (33–35). The gene discussed is TET2; the disease is lymphoma.