Regeneron (REGN) Withdraws sBLA for Libtayo in Cervical Cancer Posted byZacks Equity Research January 31, 2022 Leave a comment on Regeneron (REGN) Withdraws sBLA for Libtayo in Cervical Cancer Regeneron (REGN) and partner Sanofi voluntarily withdraw the supplemental biologics license application for Libtayo in second-line treatment of advanced cervical cancer.