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Elizabeth Comen, MD

Assistant Attending Physician
Breast Medicine Service
Memorial Sloan Kettering Cancer Center
New York, New York

Current Research

Goal: To develop a blood-based test that can identify breast cancer patients whose disease may spread to other sites in the body (metastasize).

Impact: Drs. Comen and Tavazoie are studying molecules called microRNAs that are released into the blood by cancer cells and could be used to detect and classify breast cancer. Their work could help predict which patients are at risk of metastasis and also identify those who may respond well to chemotherapy and targeted anti-cancer drugs. 

What’s next: The team has discovered that measuring certain microRNAs in blood can identify which patients have metastatic breast cancer (MBC) and which do not, as well as distinguish between those with breast cancer versus benign disease. They will now add more patients to their study in order to confirm these findings.

Tumors release many factors into the blood that could be used to monitor the progression of breast cancer. These include microRNAs that, depending on the genes they act on, can stimulate, or suppress tumor formation and growth. Drs. Comen and Tavazoie are examining specific microRNAs in the blood of breast cancer patients and determining  the role they play in the progression of the disease. Their studies will help to develop biomarkers that could aid diagnosis and guide treatment decisions.

Full Research Summary

Research Area: Studying the blood of cancer patients to identify new predictive markers to aid in the clinical management of breast cancer.

Impact: Recent work has revealed that cancer cells have the remarkable capacity to communicate with other cells by releasing structures called exosomes into circulation. These exosomes contain RNAs including a class of small-RNAs called microRNAs, which can modulate the expression of many genes involved in tumor growth. Drs. Comen and Tavazoie are conducting studies to harness the information contained in circulating microRNAs in innovative ways to improve the clinical management of breast cancer. 

Current Investigation: Drs. Comen and Tavazoie aim to discover specific microRNAs that are present in the circulation of breast cancer patients, to use these circulating microRNAs as molecular probes to study how they drive breast cancer progression, and to develop them into biomarkers for the detection and classification of breast cancer.

What they’ve learned so far: The team has been successful in demonstrating both the ability to isolate circulating microRNAs from samples of blood and to use the microRNAs to distinguish breast cancer patients with benign breast diseases from patients with localized breast cancer and patients with metastatic breast cancer from those with early-stage disease.

What’s next: In the coming year, Drs. Comen and Tavazoie will recruit an additional 50 women of similar age, ethnicity, and breast cancer subtype to validate the diagnostic and prognostic value of circulating microRNAs. They will extend their analysis to other types of small-RNAs such as tRNA fragments. The proposed work has important potential for clinical impact and could provide novel insights into this largely unexplored area of circulating small-RNAs in cancer.


Dr. Elizabeth Comen is a medical oncologist at Memorial Sloan Kettering Cancer Center with a practice devoted to the study and treatment of patients with all stages of breast cancer. Dr. Comen earned her BA from Harvard College and her MD from Harvard Medical School. She completed residency at Mount Sinai Hospital and her fellowship at Memorial Sloan Kettering Cancer Center. She has presented her research many times at the American Society of Clinical Oncology (ASCO) Annual Meeting and the San Antonio Breast Cancer Symposium. She has also been awarded several peer-reviewed grants, including the Young Investigator Award from the Conquer Cancer Foundation of ASCO.

Dr. Comen’s research focuses on the mechanisms by which breast cancer metastasizes and spreads to distant organs. In particular, she collaborates with several laboratories to help translate laboratory discoveries regarding metastasis into clinically meaningful treatments for patients at risk for and with metastatic breast cancer. With her laboratory collaborators, Dr. Comen aims to identify unique biomarkers that can help identify new diagnosis of breast cancer as well as identify those women with early-stage breast cancer who are at increased risk for metastasis. For patients with metastasis, the team is using laboratory methods understanding of metastasis to develop more effective and less toxic treatments.

Grid Researcher Headshot - Comen E

BCRF Investigator Since


Donor Recognition

The Lampert Foundation Award

Area(s) of Focus