RE: Touk vs Opti at 8:191 May 2025 08:00
On whether AVA6000 works and why it doesn't work in all cases....
Well, 'working' is a two-stage process.
Firstly the drug, doxorubicin, needs to be cleaved from the peptide linker by the FAP enzyme, and only by the FAP enzyme. This is the core IP and it has been shown to work for at least three research compounds - AVA6000, AVA3996 and the chosen AVA6103 compound - and will have worked for others that Avacta haven't put into the public domain.
Then the drug, doxorubicin, needs to have efficacy against the cancer indications being 'treated' in the Phase 1a safety, tolerability and initial efficacy trial. The first part of this trial, the early cohorts, was to test and prove that the doxorubicin was indeed cleaved within the tumor microenvironment. To do this, the only important consideration was that there should be high levels of FAP present. Having proved this, the subsequent cohorts were orientated towards cancer indications that were recognized as being susceptible to doxorubicin and this targeting to where efficacy would be greatest was then enhanced by the collaboration with Tempus AI.