Abstract

We report studies of 12 patients with refractory anemia and excess of blasts in transformation (RAEB-t) and 17 with acute myeloblastic leukemia (AML) after RAEB. Besides chromosome 5 and 7 abnormalities, five patients with complex karyotypic changes had monosomy 22. This association is discussed in relation to the hypothesis of a suppressor gene located on chromosome 22.

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