Jumping in for the first time to the hot antibody-drug conjugate (ADC) space, Paris-based Ipsen SA pulled in exclusive global rights to a preclinical ROR1-targeting candidate from Sutro Biopharma Inc. in a deal worth up to $900 million. STRO-003, the first ADC to join Ipsen’s portfolio, contains an anti-ROR1 human IgG1 antibody (SP-11385) conjugated to an exatecan warhead, or payload.