6816 ISSN 2286-4822 www.euacademic.org EUROPEAN ACADEMIC RESEARCH Vol. III, Issue 6/ September 2015 Impact Factor: 3.4546 (UIF) DRJI Value: 5.9 (B+) The Expression Pattern of CD45 among Sudanese ALL Patients Using Flowcytometry FATIMA A. TAHA 1 Medical Laboratory Second Specialist Hraa Medical center, Khartoum, Sudan ENAAM A. ABDELGADER Associate Professor of Hematology, Al Neelain University, Sudan Consultant Clinical Hematologist Radiation and Isotope Center - Khartoum (RICK) OSAMA A. ALTAYEB Flowcytometry Consultant, Flowcytometry Laboratory Khartoum, Sudan EMAN ABBASS F. Flowcytometry Specialist, Flowcytometry Laboratory Khartoum, Sudan AMIN A. AL-AMIN Consultant Haematopathologist, Flowcytometry Laboratory Khartoum, Sudan GADA M. A. MERGHANI Medical Laboratory Specialist, Flowcytometry Laboratory Khartoum, Sudan TARIG M. KARFIS Medical Laboratory Specialist, Flowcytometry Laboratory Khartoum, Sudan ELDIRDIRI M. ABDELRHMAN Associate Professor of Medicine and Oncology (KCMS) Khartoum College of Medical Sciences OSMAN H. MOSA Consultant Clinical Haematologist, Fedail Hospital MOHAMMED A. ABDALLA Consultant Pediatric Oncologist, University of Khartoum Abstract: Back ground: Acute lymphoblastic leukemia is malignancy of immature lymphoid cells, comprises approximately 80% of pediatric acute leukemia and 20% of adult cases. CD45 has potential role in the function of earlier, undifferentiated hematopoietic progenitor cells was