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Amid various woes that forced Novartis to warn profits may disappoint this year, one area was thought to be a bright spot — biosimilars. Its Sandoz unit has been a leader in marketing these lower-priced versions of expensive biologics, but last month hit an unexpected snag.

Buried in its earnings announcement this morning was a brief sentence saying it received some bad news from US regulators. The Food and Drug Administration issued a so-called complete response letter rejecting its bid — for now — to market a biosimilar version of Neulasta, which was a $4.7 billion seller last year for Amgen. The drug is used to help people make white blood cells after receiving chemotherapy.

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Novartis provided virtually no information about the FDA decision, other than to tell analysts on a conference call that the situation is “complex.” The disclosure was at the end of a long list of developments that was called “Results from important clinical trials and other highlights.”

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