Mark C. Deleon, MD

Mark DeLeon, MD, is a board-certified medical oncologist and hematologist with Ascension Sacred Heart. He provides personalized, compassionate to patients with cancer or diseases of the blood. Dr. DeLeon has a special interest in general hematology, anemia, multiple myeloma, and lymphoma, as well as breast, lung, colorectal and prostate cancer. For patients with advanced malignancies, he is passionate about palliative care efforts and balancing treatment guidelines with quality of life goals and values. Throughout his career, Dr. DeLeon has held a variety of leadership positions, including chief of staff and member of the board of trustees for Hill Country Memorial Hospital in Fredericksburg, Texas, as well as department chair of hematology and oncology at Wilford Hall Medical Center in San Antonio and member of the executive committee for Cancer Care Centers of South Texas. He served for 17 years in the U.S. Air Force, where he achieved the rank of Lt. Colonel at Wilford Hall Medical Center in San Antonio. Outside of the office, Dr. DeLeon enjoys cycling, playing Pickleball and spending time with his family.