Trisomy 11 in acute phase of chronic myeloid leukemia

A female patient with chronic myeloid leukemia in acute phase was found to have trisomy 11 in her bone marrow cells. The contemporary existence of different clones suggests the following clonal evolution: 46,XX leads to 46,XX,Ph' leads to 47,XX,Ph', +11 leads to 48,XX,Ph', +11, +Ph'. It is suggested, that the cytogenetic events leading to trisomy C in advanced cases of chronic myeloid leukemia are of a different character than those which often results in trisomy C in other myeloid disorders.