John J. Cuaron, MD

Radiation Oncologist

4.9 | 227 reviews

Areas of Expertise

Conditions I Treat

Breast cancers and conditions
Gastrointestinal cancers and conditions
Rectal cancer

My Specialties

Image-guided radiation therapy (IGRT)
Intensity-modulated radiation therapy (IMRT)
Stereotactic radiosurgery (SRS)

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English

Get to Know Me

I am a radiation oncologist who cares for people with gastrointestinal, breast, brain, and spine tumors. I see patients at Memorial Sloan Kettering Commack on Long Island.

As Lead Service Chief of the regional network at Memorial Sloan Kettering Cancer Center (MSK), I have the privilege of overseeing regional network operations and working to ensure that our patients receive the highest quality of care at every MSK location.

Treating cancer is a team effort — I never work in a vacuum. I partner with my colleagues in medical and surgical oncology, radiology, and pathology to make a diagnosis and develop a personalized treatment plan for each patient.

Most patients are curious about who is on their care team, how we work together, and what our treatment strategy will be. During initial consultations and subsequent visits, I work to make sure that my patients are well informed of all these aspects of their care. It is very empowering for people to see the blueprint and be a part of the team.

Patients also want to know about radiation therapy — what it is, how it works, and what it will feel like. The radiation we use to treat cancer is very different and much safer than what people may have seen or heard about in popular culture. A large part of my initial consultation with patients outlines the specifics of radiation therapy and allows them to become familiar with treatment and side effects so they know what to expect before treatment starts.

In addition to my clinical practice, I am involved in a number of cancer clinical trials at MSK Commack and MSK in Manhattan. One example is a study of patients needing treatment for lung tumors. Since tumors in the lungs tend to move as people breathe, we are using miniature GPS beacons that can be implanted next to the tumors so that we know the radiation beams are accounting for the movement. This technology will allow for more precise treatment and potentially fewer side effects because less of the healthy lung tissue is impacted. I am also interested in studying the clinical and biological aspects of proton therapy, an advanced form of radiation therapy that allows for the most amount of normal tissue to be spared.

In addition to my clinical practice, I am involved in a number of cancer clinical trials at MSK that are aimed at improving the effectiveness of treatment while decreasing side effects for people with breast and gastrointestinal cancers.

Like many families, mine has been impacted by cancer. My personal experiences lead me to understand that doctor-patient relationships are critical to providing great care for people. To that end, I hope my patients feel informed and confident about their care. I also hope they feel they have a guide they can turn to during a time that can be confusing, frustrating, and frightening.

What I Do at MSK

A radiation oncologist is a cancer doctor with special training in using radiation therapy (RT) to treat cancer with radiation.

Lead Service Chief, External Beam Radiotherapy Service: Regional Care Network

Conditions I Treat

Breast cancers and conditions
Gastrointestinal cancers and conditions
Rectal cancer
Anal cancer
Pancreatic cancer
Liver cancer and conditions
Brain tumors
Metastatic cancers

My Specialties

Image-guided radiation therapy (IGRT)
Intensity-modulated radiation therapy (IMRT)
Stereotactic radiosurgery (SRS)

Education

MD, Boston University School of Medicine

Residencies

Radiation Oncology - Memorial Sloan Kettering Cancer Center

Board Certifications

Radiation Oncology

Awards and Honors

Castle Connolly: America’s Top Doctor (2025)
Castle Connolly: America’s Top Doctor (2024)
Top Doctors New York Metro Area, Castle Connolly (2023)
Castle Connolly: America's Top Doctors (2023)

Insurance Information

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New Patients

Scheduling an appointment is easy. Click or call 800-525-2225— we’re available 24 hours a day, 7 days a week

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Current Patients

Request an appointment by logging in to MSK MyChart or calling your Care Team. If you are not enrolled in MSK MyChart, ask your Care Team to send you an invitation. You can also go to MSK MyChart and select “Sign up now.”

Contact and Location

Dr. Cuaron sees patients at one location.

Office Phone

631-623-4278

Location

Commack, NY

Looking to see a doctor at a different location? See all MSK locations.

Colleagues

Doctors at Memorial Sloan Kettering work as teams, with specialists from all different areas. This allows us to consider all your needs together, and to give you the best possible care.

See all Radiation Oncology doctors

See all External Beam Radiotherapy Service, Manhattan doctors

See all External Beam Radiotherapy Service, Regional Care Network doctors

Clinical Trials

Find a Clinical Trial for You

Memorial Sloan Kettering's doctors and scientists are constantly developing new treatments for cancer. MSK is typically running hundreds of clinical trials at a given time.

You may be able to participate in a clinical trial even if you are new to MSK. Search our online directory to find trial information and see more about who can participate.

Search clinical trials

Research and Publications

Publications on PubMed

Visit PubMed for a full listing of Dr. Cuaron’s journal articles. Pubmed is an online index of research papers and other articles from the US National Library of Medicine and the National Institutes of Health.

See all on PubMed

Patient Reviews

Your trust is our main concern

We strive to keep reviews trustworthy, honest and fair. Learn more about our patient experience reviews.

4.9 227 reviews

4.9 Provider's Explanations Easy to Understand
4.9 Trusts Provider with Care
4.9 Provider Listened Carefully
4.9 Likelihood of Recommending Provider

Mar 13, 2025

I was very impressed with Dr. Cuaron, as I have been with MSK in every regard. I was pleased to hear about the clinical study testing lower effective doses of radiation and I have no doubt that this will be important in the future. My decision not to receive radiation is because of my low risk of recurrence, and I would surely have gone ahead otherwise.

Mar 12, 2025

1 hour wait to see doctor

Mar 12, 2025

I got satisfied with my questions related to my problem and I got fully satisfied with the answers from Dr JOHN CUARON HE VERY POLITELY EXPLAINED ANSWERED ALL MY QUESTIONS. I THINK HE IS THE BEST DOCTOR I REALIZED AFTER LONG CONVERSATION WITH HIM. I LIKE TO BE TREATED BY SLOAN KETTERING. THAN YOU.

Mar 12, 2025

Dr Cuaron was very kind, and generous with his time. I felt very comfortable with him .

Mar 6, 2025

MSK had sent a schedule of appointments. I had left work earlier than necessary. My oncologist appointment was not supposed to be scheduled but the appointment was.

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Disclosures

Doctors and faculty members often work with pharmaceutical, device, biotechnology, and life sciences companies, and other organizations outside of MSK, to find safe and effective cancer treatments, to improve patient care, and to educate the health care community.

MSK requires doctors and faculty members to report (“disclose”) the relationships and financial interests they have with external entities. As a commitment to transparency with our community, we make that information available to the public.

John J. Cuaron discloses the following relationships and financial interests:

No disclosures meeting criteria for time period

If you’re a patient at MSK and would like more information about your doctor’s external relationships, please talk with your doctor.

The information published here is a complement to other publicly reported data and is for a specific annual disclosure period. There may be differences between information on this and other public sites as a result of different reporting periods and/or the various ways relationships and financial interests are categorized by organizations that publish such data.

This page and data include information for a specific MSK annual disclosure period (January 1, 2023 through disclosure submission in spring 2024). This data reflects interests that may or may not still exist. This data is updated annually.

Learn more about MSK’s COI policies here. For questions regarding MSK’s COI-related policies and procedures, email MSK’s Compliance Office at ecoi@mskcc.org.

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