Scientific Program
The Scientific Program will include the Plenary, Clinical Trials, Late-breaking Abstract sessions, as well as the popular Science Highlights and Cancer Breakthroughs session.
The Call for Abstracts for AM 2026 is now closed. Notifications of acceptance (including late-breaking shell submissions) will be sent to the presenting author only on May 14, 2026.
NEW for 2026!The Late-breaking Abstract (LBA) submission process is changing to ensure we are highlighting the very top science at every stage of planning. Late-breaking abstract shell submissions — placeholders for which no data are required — were due on the regular submission deadline of February 24, 2026. Notifications of acceptance (including late-breaking shell submissions) will be sent to the presenting author only on May 14, 2026.
If accepted, data for LBAs will be due on July 10, 2026. No results or conclusions are required for shell abstracts. Please review the abstract guidelines and mark your calendar for the key abstract deadlines below:
2026 Important Dates
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Abstract Submission Site Opens (including Late-breaking Placeholder (shell))
| December 4, 2025
| Abstract Submission Site Closes
| February 24, 2026, at 11:59 p.m. Pacific time
| Late-breaking Placeholder (shell) Abstract Submission Deadline
| February 24, 2026, at 11:59 p.m. Pacific time
| Abstract Notification Sent to Presenting Author
| May 14, 2026
| Abstract Withdrawal Deadline
| June 28, 2026
| Late-breaking Final Data Submission Deadline
| July 10, 2026, at 11:59 p.m. Pacific time
| Abstract Titles, including LBAs; Released on the Annual Meeting Portal
| May 14, 2026
| Regular Abstracts Released in the Red Journal Annual Meeting Proceedings
| September 25, 2026, at 5:00 p.m. Eastern time
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The Scientific Program will include the Plenary, Clinical Trials, Late-breaking Abstract sessions, as well as the popular Science Highlights and Cancer Breakthroughs sessions.
Oral Sessions
Oral sessions feature highly rated and impactful scientific abstract presentations with opportunity for question and answers.
Quick Pitch Sessions
Quick Pitch sessions provide opportunities for presenters to summarize outcomes while highlighting key takeaways from their research in a fast-paced format to present concise takeaways. Moderators engage the audience during the general question and answer section.
Science Highlights
Science Highlights sessions spotlight four to six of the most clinically relevant abstracts within each track. Each session will feature a Discussant to present the abstracts. The Discussant will compare and contrast the current data to help attendees digest the latest science, place the study into context and describe how the study can be put into clinical practice, if recommended.
Posters
ASTRO's posters feature the latest scientific case studies, practice innovations and research from experts in the field of radiation oncology, including Clinical Trials in Progress.
Presenter Resources
Provides presenters with essential tools and information to prepare for their sessions. It includes guidelines, technical support details and tips to ensure a smooth and successful experience at the event.
Abstracts
The 2026 Call for Abstracts site is CLOSED, and notifications will be sent on May 14, 2026. Learn more about the abstract submissions process and guidelines.
Late-breaking abstract shell submissions were due on the regular submission deadline of February 24, 2026. If accepted, data for LBAs will be due on July 10, 2026. No results or conclusions are required for shell abstracts.
