A second window for results that arrive after the main deadline.
The late-breaking round exists for genuinely new findings: data that did not exist when the main deadline passed on 31 July. It is not a second chance for abstracts that missed the first deadline, and submissions that could have been made in the main round are declined.
Accepted late-breaking abstracts are presented as posters. A small number of the highest-scoring submissions are additionally invited to the late-breaking oral session on the final morning.

The same categories as the main round.
Reviewers look for data generated or analysed after 31 July. You will be asked to state briefly why the work could not have been submitted in the main round.
No. The same blinded process and the same scoring criteria apply, on a compressed timetable.
Yes. Late-breaking posters are eligible for the poster prize on the same terms as everything else.
Late-breaking submissions open on 1 September 2027.
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