
Areas of Expertise
Conditions I Treat
- Pancreatic cancer
- Gallbladder cancer
- Bile duct cancer (cholangiocarcinoma)
My Specialties
- Immunotherapy
- Clinical trials
Get to Know Me
I am a medical oncologist who cares for people with pancreatic and hepatobiliary (hep-uh-toh-BIL-ee-air-ee) cancers, including:
- Pancreatic cancer
- Liver cancer
- Bile duct cancer (cholangiocarcinoma)
- Gallbladder cancer
- Other gastrointestinal cancers
At Memorial Sloan Kettering Cancer Center (MSK), I work closely with a team of experts across medical areas. These include:
- Surgery
- Medical oncology
- Gastroenterology
- Radiation oncology
- Integrative medicine
- Social work
Together, we create a care plan that best treats each person’s cancer while honoring their personal wants and needs for cancer treatment. To achieve these goals, I communicate clearly and effectively with every patient, their family, and other team members. I strive for excellence in these areas as part of my commitment to offer the best possible care.
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My research focuses on developing new therapies for pancreatic cancer, such as:
- Gene-based treatments.
- Immunotherapy (including vaccines).
- Personalized treatments that target a cancer’s unique molecular makeup.
I also lead many clinical trials for people with this disease. Our hope is that this work leads to approved treatments that help people with pancreatic cancer live longer and have a better quality of life.
I co-direct a major federally-funded grant called the Specialized Program in Research Excellence (SPORE) for pancreatic cancer. This grant supports investigators using the latest molecular biology and clinical advances to improve care for people with pancreatic ductal adenocarcinoma (PDAC).
I have authored and co-authored more than 400 articles, editorials, and book chapters. I also serve as Associate/Senior Editor for several major journals.
In addition to caring for patients and leading research, I am Chair of MSK’s Human Research Protection Program and the Institutional Review and Privacy Board. In this role, I work closely with a team of people to oversee how research is conducted at MSK.
Education is another important part of my work. I teach and mentor national and international oncology fellows, junior faculty, residents, house staff, and students. It’s an honor to have been recognized with many teaching awards for these efforts.
Outside of MSK, I work with groups and experts around the world to improve care for people with pancreas and hepatobiliary cancers. I am Co-Chair of the National Cancer Institute (NCI) Alliance Co-Operative Group Gastrointestinal Cancers Committee and a member of the NCI’s Gastrointestinal Cancers Steering Committee. These committees are involved in developing and overseeing federally-funded clinical trials in gastrointestinal cancers.
I also serve on the medical and/or scientific advisory board of various organizations and other national/international committees including:
- Pancreatic Cancer Action Network
- American Society of Clinical Oncology Guidelines Committee
- European Society of Medical Oncology Guidelines Committee
- National Pancreas Foundation
- Hirshberg Foundation
- Avner Foundation
In my spare time, I enjoy being with my family, reading, classical music, traveling to Europe and Asia, cultivating plants, and watching films.
A gastrointestinal (GAS-troh-in-TES-tih-nul) medical oncologist is a cancer doctor who specializes in gastrointestinal (GI) cancers. This includes anal, colorectal, esophageal, gastric (stomach), liver, and pancreatic cancers, as well as GI stromal tumors and neuroendocrine tumors.
- Winthrop Rockefeller Endowed Chair of Medical Oncology
- Chair, Human Research Protection Program and Institutional Review Board
- Co-Director, Medical Initiatives, David M. Rubenstein Center for Pancreatic Cancer Research
- Section Head, Hepatopancreaticobi
Conditions I Treat
- Pancreatic cancer
- Gallbladder cancer
- Bile duct cancer (cholangiocarcinoma)
- Primary liver cancer
My Specialties
- Immunotherapy
- Clinical trials
Education
- MD, Trinity College, Ireland
Residencies
- Internal Medicine - St. James's Hospital
Fellowships
- Internal Medicine/Medical Oncology - St. Vincent's Hospital (Ireland)
- Medical Oncology - Memorial Sloan Kettering Cancer Center
- Medicine - Cornell University Medical Center
Board Certifications
- Internal Medicine (Ireland)
Awards and Honors
- Castle Connolly: America’s Top Doctor (2025)
- Castle Connolly: Exceptional Women in Medicine (2024)
- Castle Connolly: America’s Top Doctor (2024)
- Top Doctors New York Metro Area, Castle Connolly (2023)
- Giant of Cancer Care, Gastrointestinal Cancer, OncLive (2023)
- Exceptional Women in Medicine Award, Castle Connolly (2023)
- Castle Connolly: America's Top Doctors (2023)
- Castle Connolly: New York Magazine Top Doctors (2005-2023)
- Burkitt Medal (TCD)
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.
In Network Coverage Type
PPO
In Network Coverage Type
PPO, POS, EPO, HMO
In Network Coverage Type
HMO, PPO
In Network Coverage Type
HMO, EPO PPO, POS
In Network Coverage Type
PPO, POS, EPO, HMO
Offers a qualified health plan from the Health Insurance Marketplace. Call Emblem to learn more.
In Network Coverage Type
PPO, HMO
In Network Coverage Type
PPO
In Network Coverage Type
HMO, EPO
Offers a qualified health plan from the Health Insurance Marketplace. Call Fidelis to learn more.
In Network Coverage Type
EPO, HMO, PPO, POS
Offers a qualified health plan from the Health Insurance Marketplace. Call Healthfirst to learn more.
In Network Coverage Type
HMO
In Network Coverage Type
PPO
In Network Coverage Type
EPO
In Network Coverage Type
EPO
In Network Coverage Type
Federal Government
In Network Coverage Type
HMO
City Employee Health Plans (Gold and Gold Care)
In Network Coverage Type
PPO, POS, EPO, HMO
In Network Coverage Type
State Government
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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Contact and Location
Dr. O'Reilly sees patients at one location.












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.
Clinical Trials
- Clinical Trials Investigated by Dr. O'Reilly
- A Phase 1 Study of INCB161734 in People With Solid Tumors
- A Phase 1/2 Study of Gemcitabine and Nab-paclitaxel Plus Avutometinib and Defactinib in People With Advanced Pancreatic Cancer
- A Phase 1b Study of AMG 193 Plus mFOLFIRINOX or With Gemcitabine and Nab-paclitaxel in People With Advanced Pancreatic Cancer
- A Phase 3 Study of RMC-6236 versus Standard Therapy for People with Previously Treated Metastatic Pancreatic Cancer
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- A Phase I Study of AB680 in Combination with AB122 Immunotherapy, Nab-Paclitaxel, and Gemcitabine in People with Advanced Pancreatic Cancer
- A Phase I Study to Evaluate Different Immunotherapy and Chemotherapy Combinations for Previously Untreated Metastatic Pancreatic Cancer
- A Phase IB/II Study Assessing Multiple Immunotherapy Treatments in Patients with Metastatic Pancreatic Cancer
- A Study of Pancrelipase Enzyme Replacement Therapy in People with Advanced Pancreatic Cancer
- Clinical Trials Co-Investigated by Dr. O'Reilly
- A Phase 1 Study of ASP2138 in People With Pancreatic Cancer or Stomach or Gastroesophageal Junction Cancer That Makes Claudin (CLDN) 18.2
- A Phase 1 Study of LY4066434 in People With KRAS-Mutated Solid Tumors
- A Phase 1 Study of MOMA-313 Alone and With Olaparib in People With Advanced Prostate or Pancreatic Cancer
- A Phase 1/2 Study of AMG 193 Plus IDE397 to Treat Advanced Digestive Cancers Lacking the MTAP Protein
- A Phase 1b/2 Study of RMC-6236 Plus Other Anti-Cancer Drugs (Chemotherapy, Targeted therapy, RMC-9805, and Others) in People With Advanced Digestive Tumors with KRAS Mutations
- A Phase 2 Study of an mRNA Vaccine plus Immunotherapy and Chemotherapy Versus Chemotherapy Alone for People with Operable Pancreatic Cancer
- A Phase 2 Study of NALIRIFOX Plus Radiation Therapy to Treat Pancreatic Cancer
- A Phase I Study of ASP3082 in People with Solid Tumors with KRAS G12D Mutations
- A Phase II Study of Olaparib or Placebo in Patients with Surgically Removed Pancreatic Cancer Who Have a BRCA1, BRCA2 or PALB2 Mutation
- A Phase III Study of Chemotherapy After Surgery versus Chemotherapy Before and After Surgery for Operable Pancreatic Cancer
- A Study of Glipizide to Treat High Blood Sugar in People With Pancreatic Cancer

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 trialsResearch and Publications
Visit PubMed for a full listing of Dr. O'Reilly’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 PubMedPatient Reviews
Your trust is our main concern
We strive to keep reviews trustworthy, honest and fair. Learn more about our patient experience reviews.
5.0 323 reviews
- 4.9 Provider's Explanations Easy to Understand
- 5.0 Trusts Provider with Care
- 5.0 Provider Listened Carefully
- 5.0 Likelihood of Recommending Provider
Dr O'Reilly is the best
We have always received the best care possible at Sloan. My experience with Dr. O'Reilly has been phenomenal.
Dr.O'Reilly took time to listen and explain things to us in a kind, caring and intelligent manner. She is truly a wonderful doctor
As soon that enter the door of Sloan Kettering I am treated with excellent care from reception to my physician and the same way when I leave. I have been treated this way since day one and I believe it's already 15 years the people at reception treat me as a friend since they know me for such a long time. The service of the staff is 100 plus on my score.
Dr. O'Reilly and her team are the best in every way. I am so thankful and grateful to be at MSK under the care of Dr. Eileen O'Reilly.
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.
Eileen M. O'Reilly discloses the following relationships and financial interests:
-
AbbVie
Professional Services and Activities (Uncompensated) -
Alligator Bioscience AB
Professional Services and Activities -
American Society of Clinical Oncology (ASCO)
Professional Services and Activities -
AstraZeneca
Professional Services and Activities (Uncompensated) -
AUTEM Medical, LLC
Professional Services and Activities (Uncompensated) -
Boehringer Ingelheim
Professional Services and Activities (Uncompensated) -
Bristol-Myers Squibb
Professional Services and Activities -
General Electric
Professional Services and Activities -
HMP Oncology Learning Network
Professional Services and Activities -
Hookipa Biotech
Professional Services and Activities
-
Imedex, Inc.
Professional Services and Activities -
Ipsen
Professional Services and Activities (Uncompensated) -
Leap Therapeutics Inc.
Professional Services and Activities (Uncompensated) -
Merck & Co Inc.
Professional Services and Activities (Uncompensated) -
Merus
Professional Services and Activities -
Neogene Therapeutics Inc
Professional Services and Activities (Uncompensated) -
Novartis
Professional Services and Activities -
Research to Practice
Professional Services and Activities -
Revolution Medicines
Professional Services and Activities (Uncompensated) -
Syros Pharmaceuticals, Inc.
Professional Services and Activities (Uncompensated)
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.