Avastin Decision Leaves Lingering Uncertainty As To Threshold Level Of Progression-Free Survival Benefit

In her memo revoking Avastin’s metastatic breast cancer claim, FDA Commissioner Hamburg declines to adopt a “bright-line” cutoff of median PFS improvement that would be necessary to establish efficacy, despite industry’s desire for more certainty about the threshold for approval.

FDA Commissioner Margaret Hamburg’s decision on the withdrawal of Avastin’s (bevacizumab) metastatic breast cancer claim highlights the continuing degree of uncertainty faced by sponsors who pursue accelerated approval on the basis of a progression-free survival endpoint.

Hamburg’s 69-page memo is striking in its outright rejection of most of the legal, scientific and evidentiary arguments proffered by Genentech Inc

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