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Mark M. Moasser


Breast oncologist
Physician and scientist

Dr. Mark Moasser is a medical oncologist specializing in breast cancer treatment and research. In the laboratory, he works to develop more effective therapies for breast cancer and designs clinical trials (studies to evaluate potential therapies) that he then brings to the clinic.

Moasser earned his medical degree from Tufts University School of Medicine. He completed his residency and fellowship training at New York–Presbyterian Hospital and Memorial Sloan Kettering Cancer Center.

Moasser has published his work in numerous scientific journals. He regularly presents his research findings at scientific meetings.

  • Education

    Tufts University School of Medicine, 1988

  • Residencies

    New York Hospital/Cornell Medical Center, Internal Medicine, 1991

  • Fellowships

    Memorial Sloan-Kettering Cancer Center, Medical Oncology, 1995

    Memorial Sloan-Kettering Cancer Center, Breast Cancer, 1996

  • Academic Title


I strive to apply the latest in science and medicine to ensure optimal care of patients affected by cancer.

Where I see patients (1)

    My reviews


    Overall Experience
    96 Ratings
    About our process
    Mar 29, 2023
    Very professional.
    Feb 14, 2023
    This was more about questions I had for Dr. Moasser and he answered all the questions!
    Feb 10, 2023
    Dr. Moasser is very thorough in reviewing my medical history. He is very knowledgeable and I feel confident in the treatment and monitoring plan we have in place for my care.
    Dec 30, 2022
    Dr Moasser is amazing in every way. He listens. He is attentive. He is direct. He is caring.
    Oct 05, 2022
    Excellent care and someone I implicitly trust to do what is best for me.
    Sep 28, 2022
    I love my doctor and staff.
    Jul 20, 2022
    Dr Moasser is wonderful and fast with information which takes away any worry on my part.
    Jun 15, 2022
    Dr Moasser is the best. I would recommend him (and I do) to everyone who needs an oncologist.
    Jun 08, 2022
    I came to ucsf for a second opinion
    May 18, 2022
    l appreciate all my doctors at UCSF
    Apr 27, 2022
    Dr Moasser talked very patiently to me and my daughter regards my cancer returnVery good genius of a doctor treatment & bedside manner...Luv him
    Jan 31, 2022
    I think Mark Moasser is about the best physician I've ever seen! I've transferred most of my care to UCSF because of my positive experience with Dr. Moasser.
    Jan 19, 2022
    Dr. Moasser is the best oncologist on the planet and a wonderful human too!
    Dec 09, 2021
    Dr. Moasser is an excellent physician.
    Sep 20, 2021
    Dr. Moasser is so clear and is so thorough. He is amazing.
    Sep 13, 2021
    Can't imagine a better oncologist