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 open and will close on February 24, 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 — will be due on the regular submission deadline of February 24, 2026. Data for LBAs will be due on July 10, 2026. No results or conclusions are required for shell abstracts. 

Please review the abstract guidelines before starting your submission and mark your calendar for the key abstract deadlines below:

2026 Important Dates
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

American Society for Radiation Oncology
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Arlington, VA 22202
Telephone: 703-502-1550
www.astro.org

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