Physician Departures

Overview of Texas Oncology physicians who no longer practice within Texas Oncology.

Patient medical records will continue to be maintained by Texas Oncology. To request or transfer your medical records please follow these instructions. The following physicians no longer practice with Texas Oncology.

  • Ralph Heaven, M.D., retired from Texas Oncology effective December 23, 2025.
  • Pamela Medellin, M.D., retired from Texas Oncology effective December 31, 2025.
  • Christopher Buchanan, M.D., has left Texas Urology Specialists effective February 1, 2026. Dr. Buchanan’s new practice location is THMA Burleson Urology, 12001 S. Freeway, Suite 202, Burleson, TX 76028.
  • Lisa N. Anderson, M.D., will be leaving Texas Breast Specialists-Medical City Dallas effective April 17, 2026.