Oncology
Rena Callahan, M.D.
Associate Clinical Professor of Medicine, David Geffen School of Medicine at UCLA
Dr. Rena D. Callahan is a board-certified hematologist and medical oncologist who specializes exclusively in breast medical oncology, focusing on the diagnosis and treatment of breast cancer. She practices at UCLA Health locations in Santa Clarita (Valencia) and Santa Monica, California, serving adult patients with breast neoplasms and related conditions such as bone cancer and hypogammaglobulinemia. As an Associate Clinical Professor of Medicine at the David Geffen School of Medicine at UCLA, s
22+
Years in Practice
Credentials
Board Certifications
- Hematology (American Board of Internal Medicine)
- Medical Oncology (American Board of Internal Medicine)
- Internal Medicine (American Board of Internal Medicine, 2011-2026)
Education & Training
- Perelman School of Medicine, University of Pennsylvania — M.D., 2004
- UCLA Medical Center — Residency, Internal Medicine, 2005-2007
- UCLA — Fellowship, Hematology & Oncology, 2008-2011
Peer Recognition
- Castle Connolly — Top Doctor
2022-2026 (5 years)
Clinical Focus
Subspecialties
Conditions & Treatments
Practice Details
Hospital Affiliations
- UCLA Medical Center Santa Monica & Orthopaedic Hospital
- Ronald Reagan UCLA Medical Center
- Henry Mayo Newhall Hospital
Languages
English
Experience
22+ years in practice