Complex cytogenetic findings in acute leukemia

Although certain types of acute nonlymphocytic leukemia (ANLL) are now characterized by specific chromosome translocations, certain other cases of ANLL elude simple cytogenetic classification. We describe here a case of acute myelomonocytic leukemia with a complex and unusual karyotype picture including double minutes, three definite translocations, two other possible translocations, and additional morphologic and numerical chromosome changes. The three definite translocations were t(2;11), t(2;12), and t(5;15), fitting the criteria of major karyotype abnormalities. These complex and unusual chromosome findings may relate to the rapid course of the disease.