Invitation Letter

Dear Colleagues,


On behalf of the PTCOG-NA Executive Committee and the UW Medicine/SCCA Proton Therapy Center, we are pleased to invite you to the Seventh Annual Meeting of PTCOG-NA to be held in Seattle, WA September 18 – 20, 2021. Our meeting will be held at the newly renovated Bell Harbor International Conference Center which offers scenic views of the Olympic Mountains, Mount Rainier, Puget Sound, Elliott Bay, and the Seattle skyline. 

The theme of the 7th annual meeting will be “Precision Particle Therapy”. The recent expansion in access to particle therapy provides the radiation oncologist an unprecedented ability to individualize particle selection to the tumor, multimodality regimen, and patient normal tissue. This meeting will provide an opportunity for scientific discourse and collaborative discussions from thought leaders in clinical and translational radiation oncology, medical physicists, radiation biologists on a wide range of subjects including FLASH radiotherapy, cancer immunotherapy, and the value proposition for particle therapy in 2021. Additionally, we will discuss best-practice as well as the latest evidence-based management paradigms in particle therapy.

PTCOG-NA’s mission focuses on scientific exchange, education and on capturing the collaborative opportunities to expand the clinical evidence of particle therapy. PTCOG-NA aims at identifying the most promising strategies to incorporate proton therapy as subspecialty of Radiation Oncology in the interdisciplinary management of our patients.

The schedule will allow you to explore the Seattle area throughout the weekend and enjoy our hospitality, including a visit to our SCCA Proton Therapy Center. 

The call for abstracts is now officially open. For submission guidelines please visitt LINK HERE


For regular conference updates visit and subscribe at

We look forward to your participation and spending time with you in Seattle and hope you grow from the meeting.



Anita Mahajan MD
President, PTCOG-NA
Department of Radiation Oncology
Medical Director
Mayo Clinic Proton Therapy Center
Ramesh Rengan MD, PhD, FASTRO
Professor and Interim Chair, 
Department of Radiation Oncology
University of Washington School of Medicine
Medical Director,
SCCA Proton Therapy Center
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