Re "preCISION vs immunotherapies"28 Oct 2021 15:22
In response to NDN.
preCision is the substrate that is cleaved when FAP alpha is present in the tumour microenvironment. Very importantly, the preCision chemistry stops a drug such doxorubicin from getting into the cell e.g. AVA6000. Upon interaction with FAP alpha the drug is cleaved and the drug enters the cell. The preCision chemistry is present in TMAC at the linker between affimer and drug/toxin e.g. AVA04. **Both** of these REQUIRE preCision. You can’t have TMAC without preCision and likewise the prodrug AVA6000 is no longer a prodrug when the preCision is removed.
Unpacking some of these comments:
“My point is, effectively ramping preCision ( which we basically license) over TMAC ( which we co own) is ridiculous”
preCision is used in TMAC without it, it’s no longer TMAC.
“My point is, effectively ramping preCision ( which we basically license)”
It is an exclusive license which is *very* important.
“Wind forward 12 months, what will the ramp be then, when(say) AVA021, an immunotherapy, enters the clinic? Chemo is dead, long live immunotherapies?"
This does not have to be a chemo vs immunotherapy issue. The market penetration of either or both if one is given as first line, is dependent on them becoming successful in trial.
“There’s a chance it fails and the immunotherapies succeed. How will the ramps pivot then?"
There is chance that it will succeed and that’s why it’s important that both progress concurrently. But right now one is more advanced than the other and the inflexion points are more so with AVA6000.
"Jesus - TMAC isn’t precision" and “TMAC uses preCision as the FAP-alpha linker”
This latter statement was a change of tune, clearly you’ve understood some of your mistake, but don’t want to hold your hand up. Without preCision, there is no TMAC.
“With preCision it is effectively an exclusive licensee working on a 5-10% royalty”
Now you mention exclusive.
“Non healthy tissues aren’t limited to tumour sites. Fibroblasts occur elsewhere… It’s quite possible for cleaving to work, but the chemo to accumulate in areas of fibroblast production away from the tumour”
The chemistry is very specific to the tumour site. The evidence will have been submitted in the Clinical Trial Application for AVA6000 Pro-doxorubixin back in January.
“HOWEVER! With the added targeting of affimers in TMAC the standard chemo dosing’s efficacy *MAY* be leveraged by the immunotherapy and so make TMAC a goer even if precision fails in isolation.”
Yes it may be leveraged, but the second half of your statement is off as your definition of preCision is lacking. preCision is a substrate present in both TMAC and the prodrug. You may have been trying to suggest two things, I’ll tackle both: if preCision fails in TMAC, then it won’t be entering the cell. If you are implying that preCision doesn’t work in the prodrug, then it is unlikely that it will work in the TMAC.
I'll summarise next...