Gregory R. Vlacich

Gregory R. Vlacich, MD, PhD is an Associate Professor of Radiation Oncology at Washington University School of Medicine in St. Louis. He serves as Vice Chair of Clinical Operations, Clinical Director of Satellite Operations, and Medical Director of Radiation Oncology at Alton Memorial Hospital. Board certified by the American Board of Radiology in Radiation Oncology (2016), Dr. Vlacich specializes in treating multiple cancer types using advanced radiation therapy techniques.

His educational background includes:

• BS in Molecular Biophysics and Biochemistry from Yale University (1999)
• PhD in Molecular Genetics and Cell Biology from University of Chicago, Pritzker School of Medicine (2007)
• MD from University of Chicago, Pritzker School of Medicine (2009)
• Internship at St. Vincent's Catholic Medical Center, New York (2010)
• Residency in Radiation Oncology at Vanderbilt University Medical Center (2014)

Dr. Vlacich's research focuses on improving cancer treatment outcomes through innovative radiation therapy approaches. His work spans thoracic, gastrointestinal, genitourinary, and head and neck oncology, with particular emphasis on stereotactic body radiation therapy and adaptive radiation therapy. He investigates treatment-related toxicity patterns and develops strategies to optimize radiation delivery for various malignancies, especially in elderly patients. His laboratory and clinical work bridges molecular biology insights with practical clinical applications to enhance cancer treatment precision.

His publication record shows a progression from foundational molecular biology research to clinical radiation oncology applications. Recent work emphasizes MR-guided radiotherapy, adaptive radiation therapy techniques, and biomarker development for risk stratification. This research trajectory demonstrates how basic science insights translate to improved clinical outcomes for cancer patients.

Professional recognition includes:

• RSNA Roentgen Resident/Fellow Research Award (2014)
• Board Certification by the American Board of Radiology in Radiation Oncology (2016)

Dr. Vlacich maintains an active clinical practice treating various cancers while leading research initiatives through the Siteman Cancer Center and Institute of Clinical and Translational Sciences. His work bridges basic science insights with clinical applications to improve cancer treatment outcomes and patient quality of life.

He directs radiation oncology services at Alton Memorial Hospital and is involved in multiple collaborative research projects focusing on improving radiation therapy techniques, understanding treatment toxicities, and developing personalized treatment approaches for cancer patients.