Memorial Sloan Kettering pathologist Maly Fenelus

Maly Fenelus, MD, MPH



Assistant Director, Clinical Hematology Laboratories; Director, MSK Commack Clinical Laboratory; Director, MSK Nassau Clinical Laboratory

Clinical Expertise

Clinical Laboratory Hematology and Hemostasis


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 offer many services, including screening, chemotherapy, and medical testing.

See all locations

About Me


MD, SUNY Downstate College of Medicine


Clinical and Anatomic Pathology - Northwell Health


Laboratory Medicine - Memorial Sloan Kettering

Board Certifications

Clinical and Anatomic Pathology

I am a physician who specializes in performing and interpreting laboratory tests on blood and other body fluids. I collaborate with healthcare professionals to provide diagnostic and management plans that are tailored to each patient. Making precise diagnoses requires the synthesis of observations made at the microscope with interpretations of laboratory values in the context of each patient’s clinical condition. This diagnostic process is critical for diagnosing cancer, guiding treatment decisions, and monitoring interventional outcomes.

As Medical Director of our clinical laboratories at MSK Commack and MSK Nassau I help bring the quality of MSK laboratory medicine to Long Island. My expertise is in laboratory hematology and hemostasis. Additionally, I have a special interest in developing clinical decision-making tools to facilitate diagnosing and monitoring our patients. Alongside my clinical laboratory colleagues, I ensure laboratory tests are accurate and provide meaningful information for patients and clinicians.


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.

See all Transfusion Medicine and Cell Therapy doctors

See all Clinical Chemistry doctors

See all Clinical Hematology doctors

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.

Search clinical trials


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.

Maly Fenelus 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 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, 2021 through disclosure submission in spring 2022). 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 [email protected].

View all disclosures