Background:Studying the immunophenotypic profile of T-ALL patients in Kashmir and correlation of various demographic factors. Methods: 36 patients of all age groups were registered for this study of which 35 were included in the analyses. Result: 82.86% were males and 17.14% were females. 51.43% had common thymocyte T-ALL, 28.57% had pro T-ALL and 20% had mature thymocyte T-ALL. The average age at presentation was 18.60 years. 51.43% were CD1a positive. CD2 was positive in 70.83%. 88.57% were CD5 positive while 100% were positive for CD7. 42.86% were CD34 positive. The average bone marrow blast percentage was 82.43%. The average peripheral blood TLC was 92.73 x 103 cells/cumm. Conclusion: This is the first study to report immunophenotypic and demographic profile of T-ALL in Kashmir with the aim to increase understanding of the disease and contributing to more suitable treatment options.

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