RE: NCT0496983526 May 2023 16:27
It's not quite as straightforward as that.
If it were simply [leaving group-CO2] plus [H2N-drug] forming the peptide-bonded conjugate [leaving group-CO-NH-drug] where the leaving group is always the 5140 that is the leaving group of AVA6000 then it would be technology (about to be) proven as 5140 is being shown to be inert.
However AVA3996 has a different leaving group and that needs to be shown to be inert - as well as the new bortezomib analogue, AVA2727D, needing to be shown to be safe, tolerable and efficacious as it is NOT bortezomib and, you know, the law of unintended consequences...
Why two different leaving groups? And are there any more in the pipeline? I don't know why there are two but this goes back to the original work by Bachovchin where AVA6000 and AVA3996 (named using different research codes) were exemplified. Maybe it's because they both work. Maybe it's because one works best with doxorubicin and the other with the bortezomib analogue. If there aren't going to be any other leaving groups then proving AVA3996's leaving group is inert (or at least not malign) WILL prove the technology and if each platform substrate is FAP specific, then Bob's your uncle and Fanny's your aunt.