CHEK2 and myeloid neoplasm: Among all probands and family members (patients) with CHEK2-path, 74% (59/80) had a diagnosed HM; 54% (32/59) had a myeloid malignancy, 41% (24/59) had a lymphoid malignancy, and 5% (3/59) had both myeloid and lymphoid malignancies.