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Background: Cytogenetics is one of the most important diagnostic parameters in the classification of acute leukemia. Recurrent chromosomal aberrations in acute leukemia have provided insights into the molecular mechanism of leukemogenesis. The variable frequencies of recurrent cytogenetic markers due to ethical/racial differences have been reported from Western and some Asian countries. Objective: We report cytogenetic data of largest cohort of 7209 adult and pediatric patients with de novo acute leukemia (AL) to determine the prevalence of various cytogenetic sub groups and compare with the Western and Asian population. Material & Methods: The AL patients included 2609 AML (adult: 2042, pediatric: 567), 3708 B-cell-precursor (BCP)-ALL (adult: 1300, pediatric: 2408) and 892 cases of T-ALL (adult: 480, pediatric: 412). Cytogenetic studies included conventional karyotyping and FISH using panel of probes. Results: The incidence of t(8;21) was high, comparable to other Asian countries. In comparison to our series and Western population, t(15;17) was more prevalent in Chinese population. Cytogenetic profiling of BCP-ALL revealed low prevalence of ETV6/RUNX1 in ours as well as other Asian population. The MLL aberrations in BCP-ALL and TLX1 & TLX3 aberrations in T-ALL occurred less frequently in our series as compared with Western population. Conclusion: The present study with a large cohort showed the heterogeneity of AL that involved various factors, such as age, gender and prevalence of distinct cytogenetic subgroups. Our data in comparison with other population based studies revealed differential distribution of some cytogenetic sub-groups indicating geographic heterogeneity due to differential environmental exposure which probably influenced underlying genetic susceptibility.

Cytogenetic Profile in 7209 Indian Patients with &lt;i&gt;de novo&lt;/i&gt; Acute Leukemia: A Single Centre Study from India

Cytogenetic Profile in 7209 Indian Patients with <i>de novo</i> Acute Leukemia: A Single Centre Study from India