title: Clonal heterogeneity in a patient with acute promyelocytic leukemia.
abstract: A 18-year-old man was diagnosed with acute promyelocytic leukemia (APL). The conventional cytogenetic analysis revealed normal karyotype 46, XY, t(15; 17). Reverse transcriptase polymerase chain reaction (RTPCR) identified PML-RARa chimeric transcripts. Complete remission (CR) was attained with 3 induction courses of Ara-C, daunorubicin and all-trans retinoic acid (ATRA). Three years later the patient relapsed. The blasts in bone marrow aspirate at relapse had AML-M3 morphology, and RT-PCR was positive for PML-RARa transcripts. The patient was treated with ATRA and daunorubicin without success. Two months later the blasts in bone marrow aspirate showed AML-M2 morphology, the karyotype was 47, XY, +8 and RT-PCR revealed the presence of AML1-ETO transcripts and absence of PML-RARa transcripts. The patient attained second CR with 3 induction courses -a course with Ara-C and daunorubicin and 2 courses with idarubicin, Ara-C and etoposide.
authors.affiliation: National Center of Hematology and Transfusiology, Sofia, Bulgaria.
authors.forename: M
authors.initials: M
authors.lastname: Staneva
authors.forename: Y
authors.initials: Y
authors.lastname: Zhechev
authors.forename: A
authors.initials: A
authors.lastname: Stoimenov
authors.forename: G
authors.initials: G
authors.lastname: Balatzenko
authors.forename: M
authors.initials: M
authors.lastname: Guenova