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

Karen J. Marcus, MD

  • Chief, Division of Radiation Oncology, Boston Children's Hospital
  • Institute Physician
  • Associate Professor of Radiation Oncology, Harvard Medical School

Appointment Phone

  • 888-733-4662 (New Pediatric Patients)
  • 617-632-3270 (Established Pediatric Patients)


  • 617-394-2668


Treatment Centers


Clinical Interests

Hematopoietic stem cell transplantation, Hodgkin disease, Late effects of treatment in children, Neuroblastoma, Neuro-oncology, Pediatric radiation oncology, Pediatric sarcoma and bone tumors



Board Certifications

  • Pediatrics, 1985
  • Therapeutic Radiology, 1989


  • National Cancer Institute, Pediatric Oncology, 1986


  • Children's Hospital of Philadelphia, Pediatrics, 1983
  • Harvard Joint Center for Radiation Therapy, Radiation Therapy, 1989

Medical School

  • University of Maryland School of Medicine, 1980

Physician Video