Hiram A. Gay

Hiram A. Gay, MD is a Professor of Radiation Oncology at Washington University School of Medicine, serving as Chief of the Genitourinary Service and Medical Director of Radiation Oncology at Siteman Cancer Center – South County. He holds a

• BS in Computer Engineering (1996) from University of Puerto Rico, Mayaguez
• MD (2000) from University of Puerto Rico, San Juan
• Residency in Radiation Oncology (2005) at SUNY Upstate Medical University

Dr. Gay specializes in genitourinary cancers (prostate, kidney, bladder) and head and neck cancers, with expertise in

• IMRT/IGRT
• SBRT
• Proton therapy
• Radioisotope therapy (Radium-223, Lutetium-177 PSMA)

His research focuses on:

• Radiation therapy for HPV-related oropharyngeal cancer
• AI-driven dose prediction and segmentation
• Global oncology initiatives in low-middle income countries
• Biomarker studies for normal tissue complications

Recent publications highlight AI applications in medical imaging (2024), proton therapy trials (2025), and HPV tumor heterogeneity (2023). He received the Galileo Galilei Award (2009) and leads clinical trials on:

• Prostate cancer radiation with hydrogel spacers
• Radioisotope therapy for bone metastases
• Global radiation access programs

Dr. Gay's work bridges clinical practice with translational research, emphasizing quality of life and health equity.