I would bet that it means that they were expecting the publication of the peer-reviewed, EMBARGOED, journal article (Thanks to Senti for continuously reminding us that the content of the article is most likely embargoed) prior to the scheduled talk. With just a few days to go, it's fairly apparent that the article will not be public before her talk. So, if that's the case, what would she say? That DCVax-L goes after ALL the antigens? That it's like getting a flu shot? There's nothing of significance that she'd be free to speak about.
This is all IMO, but makes perfect sense to me. Would I prefer that Linda deliver a meaty talk at the conference? Of course, but, as Ecclesiastes the Preacher said, There is a time for every purpose under heaven. Time is soon, just not now.
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