Radiation Oncologist

Chief, External Beam Radiotherapy Service, Manhattan

Conditions Treated:

Beryl McCormick

About Me

I am a radiation oncologist and Chief of the External Beam Radiotherapy Service at Memorial Sloan Kettering in Manhattan. I work as part of a team of specialists from different areas to treat people with breast cancer. We care for about 350 patients each year.

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With the exception of 18 months in the early 1980s — when I worked at Albert Einstein Hospital to gain experience with breast conservation techniques — I have been at MSK since 1974, when I was a resident.

My interest in medicine started at a young age. As a child, I was often sick with infections, and our family doctor would make a house call and put me on antibiotics. I usually felt better very soon and came to respect the healing powers of medicine. In medical school, I did research on childhood leukemia and first learned about radiation as a treatment for cancer. The field is appealing to me because I love math and physics.

I am currently researching the effectiveness of radiation versus observation in patients with low-risk ductal carcinoma in situ, a type of noninvasive breast cancer. I have also contributed to a novel treatment for certain elderly women without radiation therapy. In addition, for breast cancer patients, I continue to refine the use of radiation therapy in the prone (face-down) position. This helps improve long-term cosmetic outcomes and protect vital organs like the heart and lungs. My newest research will explore whether breast radiation after surgery has an impact on patients’ tolerance for exercise.

Patients arrive in my office with a wide range of knowledge, apprehensions, and expectations about breast cancer. I try very hard to communicate in a way that connects with them. I work to reassure them about therapy by sharing with them the excellent evidence we have from thousands of patients who have taken part in cancer clinical trials. I like to be upbeat and welcoming, as I would be with a visitor to my home. I hope patients leave with a better understanding of their condition and treatment plan.

I serve on the breast committee for the National Comprehensive Cancer Network guidelines panel. I am a former chair of the Breast Program Committee for the American Society of Clinical Oncology and former Chairman of the Breast Committee for the Radiation Therapy Oncology Group Cooperative Group. I have served on many consensus panels and have written extensively on both breast and eye cancers.

In my spare time, I love needlepoint and knitting, gardening, piano, and traveling with my family.

  • Clinical Expertise: Breast Cancer; Tumors of the Eye and Orbit
  • Awards and Honors: Castle Connolly: New York Magazine Best Doctors (1996-2016); Insitut Curie “Clinical Honoree” Award (2012); Good Housekeeping “Best Doctors in America” (1989, 1992)
  • Languages Spoken: English
  • Education: MD, New Jersey College of Medicine
  • Residencies: Memorial Sloan Kettering Cancer Center
  • Board Certifications: Radiation Oncology

New Patient Appointments

Making an appointment

Call 800-525-2225


Visit PubMed for a full listing of Beryl McCormick’s journal articles

Pubmed is an online index of biomedical articles maintained by the U.S. National Library of Medicine and the National Institutes of Health.

Clinical Trials

Research is integral to our mission at Memorial Sloan Kettering, and clinical trials help us discover better forms of patient care and treatment. For you, this could mean access to a new therapy or therapy combination. Click to see a list of the trials I’m currently leading.


Most major health insurers offer plans that include MSK as one of their in-network providers. If MSK is in-network, it means all our doctors are too. Medicaid and New York State Medicare also provide benefits for care at MSK.

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