Memorial Sloan Kettering medical oncologist Tomas Lyons

Tomas Lyons, MD

Medical Oncologist

Clinical Expertise

Breast Cancer; Immunotherapy for Breast Cancer

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Accepted Insurance Providers

Dr. Lyons accepts the following list of insurance providers. Select your insurance provider to see more details.

Contact and Location

Locations map

Find a Convenient Location

Memorial Sloan Kettering has locations throughout New York City, Long Island, New Jersey, and Westchester. These locations offers many services, including screening, chemotherapy, and medical testing.

About Me


MD, University College Cork, Ireland


Internal Medicine - Royal College of Physicians Ireland


Medical Oncology - Royal College of Physicians Ireland; Advanced Medical Oncology - Memorial Sloan Kettering Cancer Center

Board Certifications

Internal Medicine (Ireland); Medical Oncology (Ireland & Europe)

I am a medical oncologist who specializes in caring for people with breast cancer. I work within a multidisciplinary team including surgeons, medical oncologists, radiation oncologists, radiologists, nurses, and other health professionals to provide my patients with the best possible treatments for their cancer. I am committed to delivering the most up-to-date, evidence-based cancer care in a compassionate, caring, and friendly environment for my patients and their families. I currently see patients at the Evelyn H. Lauder Breast Center in Manhattan.

I specialize in treating all subtypes of breast cancer and am actively involved in the many breast cancer clinical trials going on at MSK. Our collective goal is to bring the most promising therapies to our patients. My research interests are focused on harnessing the immune system to target breast cancer. This is called immunotherapy

I, like many other health care professionals who care for patients with cancer, have also been impacted by this disease. I have personally witnessed a close family member undertake their own cancer journey. I saw the impact that the diagnosis had on both the patient and their loved ones. This firsthand experience greatly influences my approach to caring for my patients. I strive to provide care that is not only highly effective, but also compassionate. An important part of this care is clearly communicating all aspects of the diagnosis and treatment so that patients and their families feel well-informed at every step of their cancer journey.

I am committed to delivering the most up-to-date, evidence-based cancer care in a compassionate, caring, and friendly environment for my patients and their families.

Dr. Lyons

Awards and Honors

  • Irish Society of Medical Oncology Advanced Oncology Scholarship award (2015)
  • Ainsworth Scholarship (2016)


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

Smiling doctors in the lab

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.

Research and Publications

Publications on PubMed

Visit PubMed for a full listing of Dr. Lyons’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.