RE: Buy the ticket, and take the ride!6 Apr 2023 12:11
NH;
Any tox. screening, if successful, is a big thumbs up in oncology; especially when you are using peptides, nanocarriers etc.
It is on my to-do list to ask Suzy what platforms they are using for their "initial" screens, as they may vary from applying CLX001 to cells, to actually dosing a healthy rat, with a competent immune system, for example, for around 7 days (very big deal if passed).
We know it isn't toxic to immunocompromised human tumor-bearing mice, but for development, it needs to be dosed for a clinically-relevant period, to healthy animals.
Along with other datasets that are needed for a medical submission, I *think* that VAL will go down what is called an ICH S9 route - "Non-clinical evaluation for anticancer pharmaceuticals", wherein the aim would be to go straight into TNBC patients. It's a slimmer development route, with a quicker way to get to the ultimate Phase 1 submission. They will likely also incorporate some of the S6 guidelines for immunotox. testing, given the peptide aspects.
Essentially, they need (may have already) to work out what the likely dosing schedule would be, clinically. They then need to recapitulate this, probably in two animal species, and demonstrate a level of toxicity, at a given dose. They'll probably dose the complete nanocarried product, at varying doses, and then have an additional group, with the unencapsulated peptide product.
You then extrapolate down the dose. So, for a traditional cancer molecule, you could go into a cancer patient at 10x lower a dose than that which caused "severe toxicity" in 10% of rats (using an example).
That's why bringing a partner on board in the next few months is fairly ideal. They can help scope out the specific dosing schedule within which they'd like to see the data, and partner or buy it when a certain milestone has been reached. The pharmacokinetics will help with this, to see how often it would likely be needed to be dosed in the clinic.
All very exciting IMO.