Meet Garrett Nash: Colorectal Surgeon at MSK

Dr. Garrett Nash cares for people with gastrointestinal cancers at MSK, including colon, rectal, neuroendocrine, and mesothelioma, using minimally invasive surgery.
Video Details
 Surgeon Garrett Nash

Garrett M. Nash, MD, MPH, FACS, FASCRS

Colorectal Surgeon

Areas of Expertise

Conditions I Treat

  • Gastrointestinal cancers and conditions
  • Colon cancer
  • Rectal cancer

My Specialties

  • Minimally invasive surgery
  • Robotic surgery
  • Clinical trials
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Dr. Nash's Office Information
Languages: English
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Get to Know Me

I am a surgeon who cares for people with cancers of the colon, rectum, anus, appendix, and peritoneum. I also serve as the Vice President of Quality and Safety where I am responsible for managing MSK’s clinical quality, patient safety, and infection control.

I am experienced in the treatment of cancers within the peritoneal cavity (the space between the organs in the abdomen), such as pseudomyxoma peritonei and mesothelioma. Additionally, I have specialized training in using the latest surgical approaches for colorectal cancer, including robotic surgery.

When patients first meet with me, they are often anxious about their diagnosis. Many have received information about their prognosis that can sometimes be quite different from our patients’ outcomes. As a result, they have many questions about how cancer and its treatment will affect their quality of life and outlook.

I take the time to listen, address their concerns, and explain their treatment options, including how and why they may differ from those recommended elsewhere. We work together to develop a care plan that considers the specifics of each person’s cancer diagnosis. We also consider each person’s unique needs and preferences so we can offer the best possible result. I want my patients to feel supported and know that they are in the best hands at Memorial Sloan Kettering Cancer Center (MSK).

In my role as Vice President of Quality and Safety, I am committed to ensuring the best and safest experience for our patients and staff at MSK. I focus on data analysis to improve processes, teach and train staff, and help nurture a culture of safety and transparency.  As a clinician, my primary research focus is developing clinical trials to understand how cancer spreads to the peritoneal region and testing the effectiveness of peritoneal therapy.

I am the primary investigator for the ICARuS Trial (Intraperitoneal Chemotherapy After cytoReductive Surgery). This is a randomized clinical trial investigating the benefit of intraperitoneal chemotherapy (giving chemotherapy directly into the abdomen after surgery) for people with appendiceal or colorectal cancer that has spread to other parts of the body. It is the first-ever prospective trial with the primary goal of measuring the efficacy of intraperitoneal chemotherapy for appendix cancer worldwide. It is also the first randomized trial of intraperitoneal chemotherapy for colorectal cancer completed in the United States.

I am also the primary investigator of ICARuS II. This randomized clinical trial opened in 2023 and is studying the efficacy of intraperitoneal therapy for people with peritoneal mesothelioma.

In addition, I am working with scientists in medical oncology and at the Sloan Kettering Institute (SKI) to develop new therapies for peritoneal disease. For example, we are using an antibody called SADA (Self-Assembling and Disassembling) to deliver therapeutic agents, such as radioactive isotopes or chemotherapy, directly to the cancer cells. We hope to bring this from the laboratory to a first-in-human clinical trial soon. I am passionate about supporting cancer research at MSK. I have raised over $150,000 by completing numerous races for Fred’s Team®. I have run NYC Half Marathons each year from 2010 through 2014, and 10 NYC Marathons (in 2010, 2011, 2013-15, 2017, 2018, and 2021-2023).

To learn more about Fred’s Team® or to make a donation, visit fredsteam.org.

What I Do at MSK

I'm a colorectal (KOH-loh-REK-tul) surgeon, which is a doctor with special training in surgery on the colon and rectum.

  • Vice President of Quality and Safety
Areas of Expertise

Conditions I Treat

  • Gastrointestinal cancers and conditions
  • Colon cancer
  • Rectal cancer
  • Neuroendocrine tumors
  • Mesothelioma

My Specialties

  • Minimally invasive surgery
  • Robotic surgery
  • Clinical trials
  • Intraperitoneal chemotherapy
Education & Honors

Education

  • MD, Columbia University Vagelos College of Physicians and Surgeons
  • MPH, Harvard T.H. Chan School of Public Health

Residencies

  • Surgery, University of Massachusetts Medical School
  • Surgery, NewYork-Presbyterian/Weill Cornell Medical College

Fellowships

  • Colon and Rectal Surgery, NewYork-Presbyterian/Columbia and Weill Cornell
  • Advanced Colorectal Oncology, Memorial Sloan Kettering Cancer Center

Board Certifications

  • Surgery
  • Colon and Rectal Surgery

Awards and Honors

  • Castle Connolly: America’s Top Doctor (2025)
  • Castle Connolly: America’s Top Doctor (2024)
  • Castle Connolly: America’s Most Honored Doctors – Top 1% (2022-2023)
  • Castle Connolly: Top Doctors New York Metro Area (2017-2023)
  • Castle Connolly: America's Top Doctors (2016-2023)
  • Castle Connolly: New York Magazine Best Doctors (2017-2023)

Insurance Information

Understanding your insurance options is an important part of managing your cancer care. We have relationships with many common healthcare providers and plans.

Don't see your carrier or plan? We can help you understand your coverage.

If you don't have health insurance or are worried that your care may not be fully covered, our financial assistance programs may be able to help.

If you have questions about insurance, call us at 646-497-9176.

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Current Patients
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Contact and Location

Office Phone
Location
New York, NY
Rockefeller Outpatient Pavilion
160 East 53rd Street New York NY 10022
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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.

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See all Colorectal Service doctors

Clinical Trials

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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. Nash’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

Disclosures

Members of the MSK Community 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. These activities outside of MSK further our mission, provide productive collaborations, and promote the practical application of scientific discoveries.

MSK requires doctors, faculty members, and leaders 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. Not all disclosed interests and relationships present conflicts of interest. MSK reviews all disclosed interests and relationships to assess whether a conflict of interest exists and whether formal COI management is needed.

Garrett M. Nash 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, 2024 through disclosure submission in spring 2025). 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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