AVA6000 half-life query28 Oct 2023 09:36
Is there anyone, please, with a greater medical/scientific knowledge than myself (mine is virtually zero) help me understand a point raised in the TG meeting notes.
I understand the definition of what a drugs “half-life” means - “Drugs with a longer half-life may take longer to start working, but their effects persist for longer, and they may only need to be dosed once a day, once a week, once a month, or even less frequently”.
The question asked at the meeting was-
“TG: How long before AVA6000 is cleared, what is the half-life? What is the FAP concentration?
FM: AVA6000 is eliminated in about 4 to 6 hours. Dox by comparison doesn’t hang around long. Dox has a short initial plasma half-life. When dosed Dox goes to the patients’ tissues very quickly. The maximum blood concentration is reached quickly and then there is a long terminal half-life.
A number of doxorubicin metabolites as well as the leaving group are measured. Because they are small they are measured in the urine.
Concentration of FAP is one thing but what’s important to pre|CISION is the ‘Activity’ of the enzyme because it has to be active to release doxorubicin. The presence of FAP alone does not mean there is activity.”
What is the significance (if any?) of the difference between the half-life times of Dox & AVA6000?