Mario M. Leitao, Jr., MD, FACOG, FACS

About Me

I am a board-certified gynecologic oncologist who specializes in surgery for women with ovarian, endometrial, cervical, vulvar, or vaginal cancer.

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I have a strong interest in providing minimally invasive surgical options for our patients, including both laparoscopic and robotic-assisted procedures. In 2006, I became one of the first gynecologic oncologists to use the da Vinci® Surgical System to perform robotically-assisted procedures in women with benign and malignant gynecologic conditions. Minimally invasive procedures result in less blood loss than do traditional surgeries, allowing for shorter hospital stays and faster recuperation time for patients. I serve as the Director for the Minimal Access and Robotic Surgery Program in the Department of Surgery at Memorial Sloan Kettering and have helped to build one of the best and most experienced robotic surgery programs in the world across multiple surgical specialties.

I also perform radical procedures via traditional laparotomy in cases when these more-traditional surgeries may provide better results and longer survival. These include debulking for ovarian cancer and radical procedures for other gynecologic cancers. Additionally, using the robotic approach, I perform fertility-sparing surgery (radical trachelectomy) for women with early-stage cervical cancer. I continue to seek ways to improve outcomes for my patients and continuously seek to evaluate cutting edge technologies in surgery.

I also have a strong interest in clinical research. Research is vital for development of better treatments for all patients diagnosed with cancer. People with cancer face a difficult journey, and clinical trials are just one of the tools I offer my patients to help them during this time. I serve as the principal investigator at Memorial Sloan Kettering for the Gynecologic Oncology Group — a national group conducting quality cooperative research at many institutions throughout the country.

In 2004, I completed my fellowship at Memorial Sloan Kettering and received the Michael E. Burt Memorial Award for Clinical Excellence. I then became Director of Gynecologic Services at the New Jersey Medical School, where I received the National Faculty Award from the Council on Resident Education in Obstetrics and Gynecology. I joined the Memorial Sloan Kettering staff in 2007. I am a member of many medical societies and the author of peer-reviewed scientific articles, chapters, and reviews.

I am at the Main Campus in Manhattan Monday through Thursday, and I see patients every Friday at our Basking Ridge, New Jersey, location.

  • Clinical Expertise: Minimally invasive procedures (including robotics) for patients with gynecologic malignancies and other complex benign gynecologic conditions; fertility-sparing radical trachelectomy using minimally invasive surgery or robotics; uterine sarcomas; other gynecologic malignancies
  • Awards and Honors: Castle Connolly: New York Magazine Top Doctors (2017)
  • Languages Spoken: English
  • Education: MD, University of Medicine and Dentistry of New Jersey/Robert Wood Johnson Medical School
  • Residencies: Obstetrics and Gynecology - Beth Israel Medical Center
  • Fellowships: Gynecologic Oncology - Memorial Sloan Kettering Cancer Center
  • Board Certifications: Obstetrics and Gynecology; Gynecologic Oncology

See My Colleagues


Leitao Jr. MM. Goldsmtih LT. Optimal study design and the CONSORT guidelines. (letter) Fertil Steril 2005;84:105

Leitao Jr., MM, Chi DS. Fertility-sparing options for patients with gynecologic malignancies. The Oncologist 2005;10:613-22. CME activity

Leitao Jr. MM, Chi DS. Cytoreductiv surgery for ovarian cancer. Postgraduate obstetrics and Gynecology 2004;24(10): 1-8. CME activity

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Leitao Jr. MM, Barakat RR. Medical therapy for endometrial hyperplasia and early endometrial cancer in patients desiring future childbearing. In Angioli R, Panici B., Kavanagh D, Pecorelli S., Penalver M (eds): chemotherapy for Gynecologic Neoplasms: current Therapy and Novem Approaches, 1st ed, 2004:507-517.

Hensley ML, Leitao Jr. MM, Brown CL. Management of early epithelial ovarian cancer. In: Markman M (ed). Atlas of Cancer. Phhiladelphia, PA: Current Science, 2003:87-91

Leitao Jr., MM, Hoskins WJ. Surgical cytoreductin. In: Levine DA, Barakat RR, Hosking WJ (eds): Atlas of Procedures in Gynecologic Oncology, 1st ed, 2003:45-80.

Leitao Jr. MM, Brown C. Radical abdominal hysterectomy. In: Levine DA, Barakat RR, Hoskins WJ (eds): Atlas of procedures in Gynecologic Oncology, 1st ed, 2003:33-44

Leitao Jr. MM, Chi DS. Recurrent cervical cancer. Current Treatment Options in Oncology. Gynecologic Tumors 2002; 3(2) :105-111.


Visit PubMed for a full listing of Mario M. Leitao, Jr.’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

As home to one of the world’s top cancer research centers, Memorial Sloan Kettering is typically involved in more than 900 clinical trials at a given time. Currently, clinical trials focused on the conditions I treat are enrolling new patients. If you’re interested in joining a clinical trial, click to learn about the trial’s purpose, eligibility criteria, and how to get more information.

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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. Medicaid and New York State Medicare also provide benefits for care at MSK.

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