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Oussama Abla

Title: Director, Paediatric Histiocytosis Program, Division of Haematology/Oncology
Designations: MD
Phone: 416-813-7879
Alternate Contact Name: Connie Grillo
Alternate Phone: 416 813 5977
Alternate Email:
U of T Positions: Professor, Department of Paediatrics

Hospital Positions

Staff Haematologist/Oncologist
Division of Haematology/Oncology

Chair Positions

  • Chair, International Rare Histiocytic Disorders Registry, Histiocyte Society 
  • Canadian Coordinator, LCH-IV International Trial, Histiocyte Society 
  • Chair, AAML2111 Clinical Trial, Children’s Oncology Group


Dr. Oussama Abla joined The Hospital for Sick Children (SickKids) in 2000. He received his MD degree from the University of Genoa, Italy in 1989. His post-graduate training included a paediatric residency at the Gaslini Children’s Hospital in Genoa and a paediatric haematology/oncology fellowship at SickKids in Toronto.

Dr. Abla’s clinical interests include paediatric leukemia/lymphomas with a special interest in Acute promyelocytic leukemia (APL), paediatric primary CNS lymphoma, rare paediatric lymphomas, as well as Langerhans cell Histiocytosis (LCH) and rare histiocytic disorders. 

Education and experience

Degrees, diplomas, licensures and certifications 

  • 2005–Present: Royal College of Physicians and Surgeons of Canada Continuing Professional Development Program Participant  
  • 2003: MCCQE, Medical Council of Canada, Ottawa, ON 
    Subject:  Qualifying Examination 
  • 2000–Present: Ontario Restricted License, College of Physicians and Surgeons of Ontario, Toronto, ON 
  • 1997: General Medical & Paediatric License, Beirut, Lebanon 
  • 1994: Certificate of Specialist in Paediatrics, Genoa, Italy
  • 1990: General Medical License Exam, Genoa, Italy                
  • 1989: MD, University of Genoa Medical School, Genoa, Italy

Specialty Training 

  • 2000: Paediatric Advanced Life Support Course, Toronto, ON
  • Mar 1997–May 1997: Fred Hutchinson Cancer Research Center, Seattle, Washington
    Clinical Bone Marrow Transplantation Elective                             
  • Jan 1996: Toronto General Hospital, Toronto ON
    Adult Clinical Hematology Consult Elective            
  • Aug 1993: The Hospital for Sick Children, Toronto ON
    Paediatric Endocrinology Elective  
  • 1992: Gaslini Children's Hospital, University of Genoa, Italy 
    Completed a Paediatric Oncology Seminar Series
  • 1990–1994: Gaslini Children's Hospital, University of Genoa, Italy  Paediatric Residency
    Subject: Late effects of bone marrow in transplantation in children 


1995–1997: The Hospital for Sick Children, Toronto, ON 
Fellowship in Paediatric Haematology/Oncology


  • 2020: Chair of Children’s Oncology Group-AAML2111 Clinical Trial 
  • 2019: Editor-in-Chief of “Non-Hodgkin Lymphoma in Childhood and Adolescence"
  • 2018–2019: Author of "Acute Promyelocytic Leukemia", an educational resource for patients and parents 
  • 2018: Editor-in-Chief of “Acute Promyelocytic Leukemia - A Clinical Guide”
  • 2017: Editor-in-Chief of “Histiocytic Disorders” 
  • 2015: Canadian Coordinator of the International LCH-IV Trial 
  • 2014: Primary Investigator “International Rare Histiocytic Disorders Registry” Histiocytosis Associations of America and Canada grants 
  • 2013–2019: Chair of the Rare Histiocytosis Steering Committee-Histiocyte Society
  • 2009: Editor-in-Chief of “The Hospital for Sick Children Handbook of Supportive Care in Paediatric Oncology” 
  • 2008: Author of “All About ALL”, an educational DVD for parents of children with newly diagnosed ALL


  • TEVA Pharma Grants
  • Garron Family Cancer Centre
  • National Institute of Health (NIH)
  • St. Baldrick’s Foundation
  • Histiocytosis Association of America and Canada
  • Novopharm & Childhood Cancer Foundation


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