Within clinical trials, exploratory or post-hoc subgroup analyses are widely recognized as only “hypothesis generating” due to their high potential for bias and/or misleading interpretation. This is the main reason why Sponsors cannot make efficacy claims or seek regulatory approval based on evidence of efficacy in a certain subgroup unless that benefit is consistent with…
In Part 1 of our blog series on the saga of PI3K inhibitors, we reviewed the FDA’s recent Oncologic Drugs Advisory Committee (ODAC) meeting on April 21, 2022, to discuss the agency’s concerns about PI3K inhibitors (PI3Kis). The panel voted resoundingly (16 yes votes; 1 abstention) that future approvals of PI3Kis should be supported by…
The FDA’s Oncology Division has recently taken a hard stance on PI3K inhibitors, a novel class of drugs that inhibit various isoforms of phosphatidylinositol 3-kinase (PI3K) and are approved for treating blood cancers. Recent actions by the FDA, including withdrawing some approved indications, indicate that they will likely be seeking a higher bar for new…
