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Rena D. Callahan, MD Owner verified
27235 Tourney Road Suite 2400 Valencia, CA, 91355Last time updated: 4/24/26, 4:08 PM
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About Dr. Rena Callahan
Dr. Rena Callahan is a board-certified hematologist and medical oncologist who specializes exclusively in the diagnosis and treatment of breast cancer. Practicing in Santa Monica and Santa Clarita, she integrates the latest advances in precision medicine, molecular diagnostics, and targeted therapies to deliver highly personalized care. As an Associate Clinical Professor of Medicine at the David Geffen School of Medicine at UCLA, Dr. Callahan is deeply involved in breast…
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