FDA’s Inaugural Biosimilar Review Bumpier Than First Appeared

How agency handled issues around protein content differences, statistical analyses of quality data and immunogenicity testing for Sandoz’s Zarxio may prove instructive for future 351(k) applicants.

From the outsider’s perspective, FDA’s review and approval of Sandoz Inc.’s Zarxio (filgrastim-sndz) may have seemed like a relatively smooth and straightforward affair. Yet, there were a number of scientific challenges that the agency and sponsor had to work through before the first biosimilar could be approved.

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