What we can't expect from ASCO is anything regarding endpoints, outcomes or interim results. What presenters can talk about are such things as which cohort and when it started as well as whether or not DLT events have occurred. Biomarkers such as p21 would seem to fall within preliminary data in a continuing trial, which is not acceptable. This doesn't mean data discussion can't be included in the Q&A period, but it can't be part of the published proceedings (abstract in this case).
Once p21 data is given to CTIX, it will be vetted, reduced to a PR, and shared with investors. But, reporting data and determining when data is ready for release is the domain of the host and investigators.