Chromosomal abnormalities in primary myelodysplastic syndrome

Area of Science:

• Hematology
• Cytogenetics
• Oncology

Background:

• Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.
• Cytogenetic abnormalities play a crucial role in the diagnosis, prognosis, and treatment of MDS.
• Conventional karyotyping remains a cornerstone in evaluating these abnormalities.

Purpose of the Study:

• To determine the frequency of cytogenetic abnormalities in patients diagnosed with primary myelodysplastic syndrome (MDS).
• To analyze the types and patterns of chromosomal aberrations in a cohort of MDS patients.

Main Methods:

• A case series study was conducted at The Aga Khan University Hospital, Karachi, from January 2006 to June 2012.
• Conventional karyotyping was performed at the time of diagnosis for patients meeting WHO criteria for MDS.
• Cytogenetic analysis followed the International System for Chromosome Nomenclature (ISCN, 1995).

Main Results:

• Out of 122 MDS cases, 71 underwent karyotyping; 42.3% showed clonal karyotypic abnormalities.
• Trisomy 8 (9.9%) was the most frequent abnormality, followed by complex cytogenetic abnormalities (15.5%).
• Other notable abnormalities included -7/del (7q) (4.2%) and -Y (2.8%).

Conclusions:

• Cytogenetic abnormalities are prevalent at diagnosis in primary MDS.
• Trisomy 8 is the most common cytogenetic abnormality in this patient population.
• Complex cytogenetics also represent a significant proportion of abnormalities in MDS.