Chatchawin Assanasen, MD

Chatachwin Assanasen, MD, is a professor in the Department of Pediatrics in the Division of Hematology/Oncology at the University of Texas Health Science Center San Antonio. He holds the Children’s Cancer Research Institute Distinguished Chair in Pediatric Oncology. Before joining UT Health San Antonio, Assanasen was a faculty and principal investigator at Nemours Children’s Clinic in Pensacola, Florida, where he was significantly involved in the pediatric-based Community Clinical Oncology Program.

He founded and continues to lead the Mays Cancer Center’s and Greehey global outreach program in education and research in Southeast Asia, collaborating with pediatric oncology centers in Hanoi, Hue, and Ho Chi Minh City, Vietnam, as well as academic institutions in Bangkok, Thailand and Singapore.

Assanasen also maintains ongoing collaborations with colleagues across multiple fields of study to investigate attitudes toward fertility treatment-related complications such as premature menopause and to study fertility preservation in female patients undergoing anticancer treatment.

As the former medical director for the South Texas Pediatric Blood and Cancer Center, he oversaw the transition and expansion of the division’s programs with University Health. In 2018, he began directing the UT Health Physicians practice activities for the Department of Pediatrics, working to expand the clinical footprint of pediatric programs within South Texas.

He was also named one of San Antonio Magazine's Top Doctors in 2021, 2022 and 2023.