RE:RE:RE:Conference CallFDA current guidance on surrogate endpoints (biomarkers) in solid tumors like breast cancer
"Whether tumor measures such as ORR or PFS are used as an accelerated approval or traditional approval endpoint will depend on the disease context and the magnitude of the effect, among other factors"
https://www.fda.gov/media/71195/download
https://www.fda.gov/drugs/development-resources/table-surrogate-endpoints-were-basis-drug-approval-or-licensure