Oncology
Leif Ellisen, MD PHD
Professor of Medicine, Harvard Medical School; Program Director, Breast Medical Oncology, Mass General Cancer Center
Leif Ellisen, MD, PhD, is a distinguished medical oncologist specializing in breast cancer at Massachusetts General Hospital (MGH) in Boston, MA. As Program Director for Breast Medical Oncology at the MGH Cancer Center and co-Leader of the Breast Cancer Program at the Dana-Farber Harvard Cancer Center, he treats patients with hormone receptor-positive (HR+) breast cancer, triple-negative breast cancer (TNBC), and BRCA1/2-associated breast cancers. His clinical expertise includes managing metasta
30+
Years in Practice
Credentials
Board Certifications
- Medical Oncology (ABIM)
Education & Training
- Stanford University School of Medicine — MD, 1992
- Stanford University — PhD, 1992
- Mass General Brigham/Brigham and Women's Hospital — Residency, Internal Medicine, 1992-1994
- Mass General Brigham/Brigham and Women's Hospital/Massachusetts General Hospital/Dana-Farber Cancer Institute — Fellowship, Hematology and Medical Oncology, 1994-1997
Peer Recognition
- Castle Connolly — Top Doctor
2017-2026 (10 years)
Clinical Focus
Subspecialties
Conditions & Treatments
Practice Details
Hospital Affiliations
- Massachusetts General Hospital
- Massachusetts General Hospital, Boston, MA
Languages
English
Experience
30+ years in practice