Alnylam trades partner Sanofi for Regeneron in $800M deal


Cambridge gene therapy firm Alnylam is changing alliances, cutting research ties with longtime partner Sanofi and partnering with Regeneron on new eye and central nervous system treatments.

Alnylam (Nasdaq: ALNY) has entered into an exclusive partnership with New York-based Regeneron Pharmaceuticals Inc. (NASDAQ: REGN) to develop treatments that silence harmful RNA that contribute to various diseases.

In addition to a $400 million upfront payment, Regeneron is investing another $400 million in…

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