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Radiation Oncology
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Mount Sinai Doctors ?
    • Specialty
    • Radiation Oncology
    • Languages
    • English
    • Portuguese
    • Russian
    • Spanish
    • Hospital Affiliations
    • Mount Sinai Morningside and Mount Sinai West
    • New York Eye and Ear Infirmary of Mount Sinai
    • Mount Sinai Beth Israel
    • Mount Sinai Queens
    • The Mount Sinai Hospital
    • Mount Sinai Brooklyn

Stanislav (Stas) Lazarev, MD is a radiation oncologist in the Department of Radiation Oncology at Mount Sinai and New York Proton Center. Dr. Lazarev's clinical practice is focused on the personalized treatment of CNS and pediatric tumors. He also specializes in proton beam therapy for gastrointestinal, genitourinary, and gynecologic cancers.

Dr. Lazarev graduated magna cum laude from University of California-Berkeley with a BA in Biochemistry and Molecular Biology, and received his medical degree from the University of Vermont College of Medicine where he also was inducted into the Alpha Omega Alpha National Honor Medical Society. He completed medicine internship at Highland Hospital in Oakland, California, and radiation oncology residency at the Icahn School of Medicine at Mount Sinai, where he served as chief resident. He has published numerous peer-reviewed papers on a broad range of oncological topics, and presented his work at national conferences.

His research interests include identifying and developing radiotherapy de-intensification strategies that will help decrease radiation toxicities and reduce economic, treatment, and psychosocial burden on patients without compromising their oncological outcomes. Dr. Lazarev was born and raised in southern Russia. He is fluent in English, Russian, Spanish, Portuguese, and proficient in French.



Clinical Focus


MD, University of Vermont College of Medicine

Internship, Internal Medicine
Highland Hospital

Residency, Radiation Oncology
Icahn School of Medicine at Mount Sinai


English, Portuguese, Russian, Spanish