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Torunn (Torunn) Yock, MD

Director, Pediatric Radiation Oncology

Associate Professor, Harvard Medical School

Chair, Radiation Oncology Quality Assurance

  • Phone: 617-724-1836
Department of Radiation Oncology


  • Cancer Center
  • Radiation Oncology
  • Sarcoma and Connective Tissue Oncology
  • Neuro-Oncology (Brain)
  • Pediatric Hematology/Oncology
  • MassGeneral Hospital for Children
  • Radiation Oncology
Clinical Interests
Pediatric oncology
Pediatric tumors
Pediatric brain tumors
Pediatric malignancies
Proton Radiation Therapy
Thoracic oncology
Boston: Massachusetts General Hospital
Medical Education
MD, Harvard Medical School
Residency, Massachusetts General Hospital
Board Certifications
Radiation Oncology, American Board of Radiology
Patient Age Group
Adult and pediatric
Accepting New Patients
Accepting New Patients

Dr. Yock completed her B.S. in genetics and ethics from Duke University on full academic scholarship as a National Merit and Angier B. Duke Scholar. She then acquired a Masters in Community Health as a Fulbright Scholar and from the University of New South Wales in Sydney, Australia and subsequently an MD from Harvard Medical School. Her residency was at Massachusetts General Hospital. She currently serves as the Chief of Pediatric Radiation Oncology at Massachusetts General Hospital and as an Associate Professor at Harvard Medical School, where she teaches residents, fellow, medical student and PhD students as well as lecturing in multiple continuing medical education classes.  She is an internationally recognized expert in pediatric radiation oncology and serves on multiple committees for the American Society for Therapeutic Radiation Oncology (ASTRO) and Children s Oncology Group (COG) and the American Board of Radiology in the certification process of new and tenured radiation oncologists.


Dr. Yock has published over 55 medical papers, chapters and reviews and serves on the American Board of Radiology in the certification process of new and tenured radiation oncologists. Her academic efforts have centered on the use of proton radiotherapy, intensity modulation, and image guidance to treat cancer and to spare side effects of therapy including second malignancies in the pediatric population.  MGH is one of the leaders in the development and use of proton radiotherapy and has the largest experience in the world with the pediatric population.  Dr. Yock is the primary investigator of five pediatric proton protocols and she holds grant funding from a variety of sources including the NCI.  She also participates in collaborative research with the Children's Oncology Group and is leading an NIH and MGH sponsored effort to formulate a pediatric proton research collaborative group among the pediatric proton physicians in the United States. Learn more about Dr. Yock's research.


View my most recent publications at PubMed

Partial list of recent publications, see pub med for the full list.

Tarbell NJ, Friedman HS, Yock TI, Polkinghorn W,  Zhou T, Chen Z, Burger PC, Barnes P, and Kun LE.  High-Risk Medulloblastoma: A Pediatric Oncology Group (POG 9031) Randomized Trial of Chemotherapy before or after Radiation Therapy, JCO 2013 Aug 10;31(23):2936-41.

Chung CS, Yock TI, Nelson K, Xu Y, Keating NL, Tarbell NJ.  Incidence of second malignancies among patients treated with proton versus photon radiation. IJROBP. Sep 1;87(1):46-52. 2013.
Macdonald SM, Sethi R, Lavally B, Yeap BY, Marcus KJ, Caruso P, Pulsifer M, Huang M, Ebb D, Tarbell NJ, Yock TI. Proton radiotherapy for pediatric central nervous system ependymoma: clinical outcomes for 70 patients. Neuro Oncol. 2013 Oct 6.

Tommy's Story

Tommy McGraw, 8 years old, received Proton Beam Therapy at Massachusetts General Hospital after having a brain tumor removed at their hometown hospital, Seattle Children’s Hospital.

Crushing Cancer

After their 8-year-old son had a successful brain tumor surgery in their home state of Washington, Joe and Leigh McGraw chose to take Tommy to MassGeneral Hospital for Children's Francis H. Burr Proton Therapy Center for targeted treatment. The McGraw's share the story of their experience at MGHfC in the letter and video below.

Alex’s Story: Family-Centered Care Helps Kids Be Kids Throughout Challenging Treatments

When Alex Sheehan was diagnosed with a brain tumor at age 10, staff at the Francis H. Burr Proton Therapy Center helped him simply be a kid duirng a challenging time.

Ryan’s Story: Inspired by Compassionate Care to Achieve His Dreams

When Ryan Schlosser received his master's degree this year, he thought of everyone who supported him along the way, especially his care team at the Francis H. Burr Proton Therapy Center at MGHfC, who played a larger role in his success than he ever imagined.

Francis H. Burr Proton Therapy Center
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-724-1836
Phone 2: 617-726-6876
Fax: 617-724-4808

Francis H. Burr Proton Therapy Center
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-724-1836
Phone 2: 617-726-6876
Fax: 617-724-4808

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