By Nadya Masidlover

PARIS--French pharmaceutical company Sanofi SA (SNY) and Regeneron Pharmaceuticals Inc. (REGN) said they will seek U.S. regulatory approval for a new rheumatoid arthritis drug later this year.

The two companies said Thursday that the results from phase 3 studies of Sarilumab were positive in treating the symptoms of rheumatoid arthritis.

"Sarilumab is the first fully-human monoclonal antibody directed against the IL-6 receptor (IL-6R). Sarilumab binds with high affinity to the IL-6 receptor," the companies said.

They said that a request for U.S. regulatory approval will be put forward in the fourth quarter of 2015.

-Write to Nadya Masidlover at nadya.masidlover@wsj.com

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