Neil M. Iyengar, MD

Medical Oncologist

Conditions Treated

Pictured: Neil Iyengar
Phone iconAn icon showing a telephone. New Patient Appointments Plus and Minus IconIcon showing a plus/minus toggle, indicating that the surrounding element can be opened and closed.
Phone iconAn icon showing a telephone. Phone Plus and Minus IconIcon showing a plus/minus toggle, indicating that the surrounding element can be opened and closed.

About Me

I am a medical oncologist and clinical investigator with a practice dedicated exclusively to the care of patients with breast cancer. As a member of our multidisciplinary team of specialists, I treat patients with an individualized and multifaceted approach based on cutting-edge technology and the most up-to-date research. My practice is focused on providing patients with state-of-the-art care plans using advanced technologies and innovative strategies to treat breast cancer while also providing support for general well-being, such as nutrition and exercise. Ultimately, I am dedicated to providing clear communication and understandable information regarding standard therapies as well as new and exciting research options so that patients are empowered to make informed decisions about their care.

My research investigates the links between metabolic health and cancer. I work with a highly productive team composed of clinical and laboratory scientists at Memorial Sloan Kettering, Weill Cornell Medical College, and the Rockefeller University, where I hold a joint research position. Our team has established inflammation in the breast to be a key contributor to obesity-related breast cancers. As obesity rates are on the rise in the United States and worldwide, we are seeing an increase in obesity-related cancers. We have shown that inflammation in the fatty tissue of the breast and at other anatomic sites occurs in most obese and overweight individuals and even in some individuals who are normal weight. Therefore a key component of my research program is the development of clinical trials — including diets, exercise, and medications — that aim to prevent obesity-related cancers as well as improve outcomes in patients with fatty-tissue inflammation.

I work closely with nurse practitioner Odessa M. Williams. We combine our expertise to provide comprehensive care to our patients at every step of their cancer journey.

  • Clinical Expertise: Breast Cancer; Exercise Oncology
  • Awards and Honors: Career Development Award, Conquer Cancer the ASCO Foundation; Breast Cancer Research Foundation Investigator; The Society of MSK Research Grant; Young Investigator Award, Conquer Cancer the ASCO Foundation; Breast Cancer Achievement Award, Lynn Sage Breast Cancer Symposium; Young Investigator Award, Expedition Inspiration; Merit Award, Conquer Cancer the ASCO Foundation
  • Languages Spoken: English
  • Education: MD, University of Illinois at Chicago
  • Residencies: Internal Medicine - University of Chicago Medical Center
  • Fellowships: Oncology/Hematology - Memorial Sloan Kettering Cancer Center
  • Board Certifications: Internal Medicine; Medical Oncology

See My Colleagues


Visit PubMed for a full listing of Neil M. Iyengar’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. Medicare and New York State Medicaid also provide benefits for care at MSK.

Learn more Arrow rightAn icon showing an arrow pointing to the right.