Acute leukemia associated with trisomy 8 mosaicism and a familial translocation 46,XY,t(7;20)(p13;p12).

A patient is shown to have acute granulocytic leukemia, bone marrow mosaicism, and cutaneous fibroblast mosaicism for trisomy 8, an inherited reciprocal translocation involving the short arms of chromosomes 7 and 20, and a family history of cancer. A normal sister who had the same balanced chromosome translocation was evaluated for a preleukemic state; the results were unremarkable. The inherited translocation and postzygotically derived trisomy 8 are thought to represent additive factors contributing to the development of leukemia in the patient.