It depends on what is in the consent form. I sit on my hospital's IRB, and it is permissible to take blood for "additional research" not officially part of the primary or secondary outcomes so long as the consent form states the purpose. Often times it is very general, such as "research related to your disease," and often times the extra research blood draw is optional, and subjects have to indicate if they want to participate. Bottom line is that we don't know exactly what is in the protocol and consent form, so can't know for sure if they will be doing things like receptor occupance testing in the severe / critical trial.
My first post, but have been lurking here since February when I picked up my first shares after the early cancer biomarker results. I have been following the HIV story for some time since I have invested in SGMO with their CCR5 knockout cell therapies. Have often wanted to chime in, but have been hesitant to post since this would be about the 5th stock message board forum I have joined. IHub is ridiculous with its rules, so glad to be able to post here where there is fairer "policing" and some very good analysis.