Cytogenetic Profile of Childhood Acute Lymphoblastic Leukemia in Oman

Achandira Muthappa Udayakumar, Wafa Ahmed Bashir, Anil Vasant Pathare, Yasser Ahmed Wali, Mathew Zacharia, Ashfaq Ahmed Khan, Heba Soliman, Zakia Al-Lamki, John Alexander Raeburn

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Abstract

Background: Chromosomal abnormalities have important diagnostic and prognostic significance in acute lymphoblastic leukemia (ALL). The purpose of this study was to define and classify the frequency and type of chromosomal abnormalities among newly diagnosed children with ALL and compare the results with those reported from other geographical regions of the world. Methods: Bone marrow chromosomal studies with GTG banding were performed in untreated ALL pediatric patients aged from 7 days to 14 years. Results: Among Omani children examined with ALL, 47 (81%) patients yielded results, with 26 (55.3%) showing an abnormal karyotype [10 (21.3%) pseudodiploid, 2 (4.3%) hypodiploid and 14 (29.7%) hyperdiploidy] and 21 (44.6%) had normal diploidy. Structural abnormalities were observed in 16 (34%), of which 11 (23.4%) cases were translocations, the most frequent being t(9;22) observed in three (6.4%) of our patients. Uncommon translocations such as t(9;15)(p11;q10), t(3;6)(p12;q11), t(1;6)(?31;?q23), t(1;19)(q12;q12), der(18)t(12;18)(q11;p11), and other structural aberrations add(2)(q22), add(6)(q16), add(18)(q22), add(14)(q32) along with deletions del(10)(q22), del(12)(p11), del(12)(p12), del(18)(q11) were also observed. Conclusions: The study showed a good correlation and concordance between the ploidy distribution by cytogenetics and flow cytometry. The patterns of chromosomal anomalies in our patients showed some variations in the frequency of aberrations reported. It is therefore necessary that newer techniques like fluorescence in situ hybridization (FISH) along with reverse transcriptase polymerase chain reaction (RT-PCR) and spectral karyotyping will help us identify chromosomal aberrations not detected by conventional cytogenetic methods in the near future. To our knowledge, this is the first report from the Middle East of a cytogenetic study on childhood ALL.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalArchives of Medical Research
Volume38
Issue number3
DOIs
Publication statusPublished - Apr 2007

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Oman
Precursor Cell Lymphoblastic Leukemia-Lymphoma
Cytogenetics
Chromosome Aberrations
Spectral Karyotyping
Abnormal Karyotype
Polyploidy
Middle East
Ploidies
Reverse Transcriptase Polymerase Chain Reaction
Diploidy
Fluorescence In Situ Hybridization
Flow Cytometry
Bone Marrow
Pediatrics

Keywords

  • Acute lymphoblastic leukemia
  • Chromosomal abnormalities
  • Cytogenetic analysis

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Cytogenetic Profile of Childhood Acute Lymphoblastic Leukemia in Oman. / Udayakumar, Achandira Muthappa; Bashir, Wafa Ahmed; Pathare, Anil Vasant; Wali, Yasser Ahmed; Zacharia, Mathew; Khan, Ashfaq Ahmed; Soliman, Heba; Al-Lamki, Zakia; Raeburn, John Alexander.

In: Archives of Medical Research, Vol. 38, No. 3, 04.2007, p. 305-312.

Research output: Contribution to journalArticle

Udayakumar, Achandira Muthappa ; Bashir, Wafa Ahmed ; Pathare, Anil Vasant ; Wali, Yasser Ahmed ; Zacharia, Mathew ; Khan, Ashfaq Ahmed ; Soliman, Heba ; Al-Lamki, Zakia ; Raeburn, John Alexander. / Cytogenetic Profile of Childhood Acute Lymphoblastic Leukemia in Oman. In: Archives of Medical Research. 2007 ; Vol. 38, No. 3. pp. 305-312.
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AU - Pathare, Anil Vasant

AU - Wali, Yasser Ahmed

AU - Zacharia, Mathew

AU - Khan, Ashfaq Ahmed

AU - Soliman, Heba

AU - Al-Lamki, Zakia

AU - Raeburn, John Alexander

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N2 - Background: Chromosomal abnormalities have important diagnostic and prognostic significance in acute lymphoblastic leukemia (ALL). The purpose of this study was to define and classify the frequency and type of chromosomal abnormalities among newly diagnosed children with ALL and compare the results with those reported from other geographical regions of the world. Methods: Bone marrow chromosomal studies with GTG banding were performed in untreated ALL pediatric patients aged from 7 days to 14 years. Results: Among Omani children examined with ALL, 47 (81%) patients yielded results, with 26 (55.3%) showing an abnormal karyotype [10 (21.3%) pseudodiploid, 2 (4.3%) hypodiploid and 14 (29.7%) hyperdiploidy] and 21 (44.6%) had normal diploidy. Structural abnormalities were observed in 16 (34%), of which 11 (23.4%) cases were translocations, the most frequent being t(9;22) observed in three (6.4%) of our patients. Uncommon translocations such as t(9;15)(p11;q10), t(3;6)(p12;q11), t(1;6)(?31;?q23), t(1;19)(q12;q12), der(18)t(12;18)(q11;p11), and other structural aberrations add(2)(q22), add(6)(q16), add(18)(q22), add(14)(q32) along with deletions del(10)(q22), del(12)(p11), del(12)(p12), del(18)(q11) were also observed. Conclusions: The study showed a good correlation and concordance between the ploidy distribution by cytogenetics and flow cytometry. The patterns of chromosomal anomalies in our patients showed some variations in the frequency of aberrations reported. It is therefore necessary that newer techniques like fluorescence in situ hybridization (FISH) along with reverse transcriptase polymerase chain reaction (RT-PCR) and spectral karyotyping will help us identify chromosomal aberrations not detected by conventional cytogenetic methods in the near future. To our knowledge, this is the first report from the Middle East of a cytogenetic study on childhood ALL.

AB - Background: Chromosomal abnormalities have important diagnostic and prognostic significance in acute lymphoblastic leukemia (ALL). The purpose of this study was to define and classify the frequency and type of chromosomal abnormalities among newly diagnosed children with ALL and compare the results with those reported from other geographical regions of the world. Methods: Bone marrow chromosomal studies with GTG banding were performed in untreated ALL pediatric patients aged from 7 days to 14 years. Results: Among Omani children examined with ALL, 47 (81%) patients yielded results, with 26 (55.3%) showing an abnormal karyotype [10 (21.3%) pseudodiploid, 2 (4.3%) hypodiploid and 14 (29.7%) hyperdiploidy] and 21 (44.6%) had normal diploidy. Structural abnormalities were observed in 16 (34%), of which 11 (23.4%) cases were translocations, the most frequent being t(9;22) observed in three (6.4%) of our patients. Uncommon translocations such as t(9;15)(p11;q10), t(3;6)(p12;q11), t(1;6)(?31;?q23), t(1;19)(q12;q12), der(18)t(12;18)(q11;p11), and other structural aberrations add(2)(q22), add(6)(q16), add(18)(q22), add(14)(q32) along with deletions del(10)(q22), del(12)(p11), del(12)(p12), del(18)(q11) were also observed. Conclusions: The study showed a good correlation and concordance between the ploidy distribution by cytogenetics and flow cytometry. The patterns of chromosomal anomalies in our patients showed some variations in the frequency of aberrations reported. It is therefore necessary that newer techniques like fluorescence in situ hybridization (FISH) along with reverse transcriptase polymerase chain reaction (RT-PCR) and spectral karyotyping will help us identify chromosomal aberrations not detected by conventional cytogenetic methods in the near future. To our knowledge, this is the first report from the Middle East of a cytogenetic study on childhood ALL.

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