Lemez P, Attarbaschi A, Béné MC, Bertrand Y, Castoldi G, Forestier E, Garand R, Haas OA, Kagialis-Girard S, Ludwig WD, Matutes E, Mejstríková E, Pages MP, Pickl W, Porwit A, Orfao A, Schabath R, Starý J, Strobl H, Talmant P, van't Veer MB, Zemanová Z. Eur J Haematol. 2010 Oct;85(4):300–8. doi: 10.1111/j.1600-0609.2010.01493.x. IF: 2.345
Abstract:
OBJECTIVES: Patients with near-tetraploid (karyotype: 81–103 chromosomes) acute lymphoblastic leukemia (NT-ALL) constitute about 1 % of childhood ALL and data reported on them are limited and controversial. The aim of the study was to enlarge the knowledge on these rarely occurring ALL. METHODS: The members of the European Group for Immunophenotyping of Leukemias (EGIL) searched retrospectively their databases for NT-ALL patients. RESULTS: We collected data of 36 European children from seven European countries with NT-ALL diagnosed since 1992. All patients reached complete remission (CR) after induction chemotherapy. Their blasts were negative for peroxidase and BCR-ABL1. Ten children were diagnosed as T-cell ALL (T-ALL) EGIL categories (T-I n = 2, T-II n = 2, T-III n = 3, T-IV n = 3) and four displayed various structural chromosomal abnormalities. Eight of 10 T-ALL remained in 1st CR; one died in CR from sepsis and one is alive in 2nd CR. Median survival was 88 (7–213) months. B-cell precursor (BCP) ALL was diagnosed in 26 children. Thirteen were positive for ETV6-RUNX1 and are alive in 1st CR for 32–147 months. Ten children were ETV6-RUNX1 negative and remained in 1st CR for 16–163 months. One girl with hypodiploid and NT metaphases and ETV6-RUNX1-negative BCP-ALL and one of two boys with NT-BCP-ALL not examined for ETV6-RUNX1 died of infection after stem cell transplantation in 2nd/3rd CR. Secondary myelodysplastic syndrome developed in two patients with NT-BCP-ALL. CONCLUSIONS: Our data demonstrate immunophenotypic, cytogenetic, and molecular heterogeneity of NT-ALL and favorable prognosis of most NT-ALL across different immunophenotypic and/or genetic ALL subtypes.
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