Korean J Pediatr Hematol Oncol.  2005 Apr;12(1):40-46.

Constitutional Pericentric Inversion of Chromosome 9 [inv (9) ] in Pediatric Leukemia and Stem Cell Transplantation

Affiliations
  • 1Blood & Marrow Transplantation Center, Chonnam National University Hwasun Hospital, Korea. hoonkook@chonnam.ac.kr
  • 2Department of Pediatrics, Chonnam National University Hwasun Hospital, Hwasun, Chonnam National University Medical School, Gwangju, Korea.
  • 3Laboratory Medicine, Chonnam National University Hwasun Hospital, Hwasun, Chonnam National University Medical School, Gwangju, Korea.

Abstract

PURPOSE
Pericentric inv (9) occurs in about 0.8~2% of the normal population. The implication of inv (9) in hematological malignancies and/or in stem cell transplantation (SCT) has not been thoroughly elucidated. METHODS: To further delineate the characteristics, we describe our experiences of inv (9) in 2 patients who underwent SCTs and 1 patient with ALL. RESULTS: Case 1. An 11-year-old girl with AML M2 showed 46, XX, inv (9). After remission, her consolidation cycles were associated with slow platelet recovery. She underwent autologous BMT, however, the engraftment was rather slow, and relapsed at 7 months. 2nd remission was achieved after prolonged cytopenia. She underwent reduced intensity unrelated cord blood transplant. Her posttransplant course was uneventful with ANC & gt; 500/microL at D+18 and platelet > 50 k/microL at D+38. Karyotyping showed 46, XY. She is now well at 16 months after 2nd transplant. Case 2. A 10-year-old girl presented with severe aplastic anemia. Karyotyping was normal. She underwent matched sibling transplantation. Her post-transplant course was uneventful with rapid engraftment. Cytogenetics showed 46, XX, inv (9), which was originated from her sister. She is now well at 70 months posttransplant. Case 3. A 3-year-old boy with ALL had a karyotype of 46, XY, inv (9) (p11q12). His clinical course was uneventful. CONCLUSION: The first case showed typical course of delayed recovery after chemotherapy and delayed engraftment after autologous transplantation. inv (9) should be considered in cases of otherwise unexplainable delay in recovery after chemotherapy or delayed engraftment after SCT. Further studies involving larger number of cases should be warranted to delineate the exact role of inv (9) in pediatric leukemia and SCTs.

Keyword

Constitutional inv (9); Children; Leukemia; Stem cell transplantation

MeSH Terms

Anemia, Aplastic
Autografts
Blood Platelets
Child
Child, Preschool
Chromosomes, Human, Pair 9*
Cytogenetics
Drug Therapy
Female
Fetal Blood
Hematologic Neoplasms
Humans
Karyotype
Karyotyping
Leukemia*
Male
Siblings
Stem Cell Transplantation*
Stem Cells*
Transplantation, Autologous
Full Text Links
  • KJPHO
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error