Matthew Ladra, MD, MPH Radiation Oncologist



Dr. Matthew Ladra joined Children’s National Health System and Johns Hopkins Medicine in April 2016 to lead the pediatric radiation oncology program at Sibley Memorial Hospital. This clinical collaboration between Children’s National, Johns Hopkins and Sibley Memorial Hospital provides the highest level of multidisciplinary care for the region’s pediatric oncology patients. Dr. Ladra is an assistant professor, radiation oncology and molecular radiation sciences at Johns Hopkins University School of Medicine and Johns Hopkins Kimmel Cancer Center. 

Dr. Ladra is a fellowship trained pediatric radiation oncologist, having completed a two-year program at Massachusetts General Hospital, and his practice and research focus entirely on treating children.Dr. Ladra served as the director of pediatric radiation oncology at the Provision Center for Proton Therapy in Knoxville, Tennessee. His research interests focus on pediatric rhabdomyosarcoma and proton therapy, and he has published numerous peer-reviewed articles and book chapters on these subjects. 

Dr. Ladra sees patients at Sibley Memorial Hospital in the Johns Hopkins Kimmel Cancer Center and the Children’s National main campus.

Education & Training

Education & Training

  • Fellowship Program, Pediatric Proton Therapy, 2014
    Massachusetts General Hospital
  • Residency Program, Radiation Oncology, 2012
    University of Washington Medical Center
  • Internship Program, Internal Medicine, 2008
    St. Mary's Medical Center
  • MD, 2007
    Tulane University School of Medicine
  • BA, 2000
    Princeton University


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Christopher's Story

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Christopher Melkonian was six years old when he came down with a low-grade fever and diffuse bone pain. Unsure of what was happening, his parents Darlene and David took him to Children’s National Health System and soon found out that Christopher had acute lymphoblastic leukemia (ALL), a type of blood and bone marrow cancer that affects white blood cells.

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