RE: Potentially fast-tracking 0518 combo for RCC25 Mar 2022 11:16
It’s possible that there might be an avenue for blautix to go through the fda’s fast track pathway but I expect that would hinge on whether or not the fda considers its potential to treat ibs m as enough to consider it as meeting an unmet need. If it could go down the fast track route it would still need to do phase 3 before hitting the clinic commercially but the contact with the fda would be more frequent and quicker, which is what shortens the overall length of time required to conduct a phase 3 trial and get it to clinic.
mrx0518 on the other hand should be a good candidate for the fda’s accelerated approval pathway using a surrogate endpoint. Accelerated approval of drugs and biologics is only considered for serious, life threatening conditions. In oncology the surrogate endpoint would typically be tumour shrinkage but there is wiggle room there on the exact endpoint and I think that wiggle room would be required for mrx0518/keytrdua combo in ice refractory rcc patients. Whilst the likelihood of tumour shrinkage in such patients is not impossible, it's not the norm. That’s why steady disease control is considered an important and clinically meaningful endpoint in this cohort. Whether or not it’s an endpoint that the fda would allow for accelerated approval I'm not sure but I imagine it should be given the alternative to halting progression and keeping quality of life steady is continued worsening to the end.
This is the up to date list of drugs that are currently on/have been through the accelerated approval pathway. You’ll note how many are for cancer.
https://www.fda.gov/media/151146/download
One thing to note about the accelerated approval process is that congress is currently examining it and considering a raft of changes. I won’t regurgitate everything they are looking at but one aspect of note is that some have proposed changing rules around the phase 4 confirmatory study. Currently, before accelerated approval is given a company needs to design and agree details of the confirmatory study with the fda but they don’t need to actually start the study before the drug is in the clinic. The change that some are proposing is to require that the confirmatory study actually begin before approval is granted. This would obviously have the effect of slowing down the speed at which approval can be granted and drugs can be put in the clinic, something that a lot of patient advocates are understandably against.
https://www.pharmexec.com/view/fda-congress-re-examine-accelerated-approval-program