Appointments and Second Opinions

Speak with one of our New Patient Coordinators to schedule an appointment, refer a patient or request a second opinion. In urgent cases, we can typically see new patients within 24 hours.

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Find Clinical Trials

We sponsor and collaborate on clinical trials that break new ground in pediatric cancer and blood disorder treatment. 

Search Pediatric Cancer and Blood Disorder Clinical Trials
Our Affiliations
HMS Affiliate

Dana-Farber/Boston Children's is a teaching affiliate of Harvard Medical School.

Our Affiliations

Mark D. Fleming, MD, DPhil

  • Pathologist-in-Chief, Boston Children's Hospital
  • S. Burt Wolbach Professor of Pathology, Harvard Medical School

Office Phone

  • 617-919-2664

Appointment Phone

  • 617-919-2664


  • 617-730-0168


Treatment Centers


Clinical Interests

Iron metabolism, Pediatric hematopathology



Board Certifications

  • Anatomic Pathology
  • Hematopathology


  • Boston Children's Hospital, Hematology/Oncology, 2000
  • Brigham and Women's Hospital, Hematopathology, 1996


  • Brigham and Women's Hospital, Anatomic Pathology, 1995
  • Brigham and Women's Hospital, Senior Resident, Surgical Pathology, 1996

Medical School

  • Harvard Medical School, 1993