The deal that could bring IGM Biosciences Inc. more than $6 billion is 2022’s largest and cracks the BioWorld top 10 list as the ninth biggest ever. Sanofi SA and IGM agreed to develop, manufacture and commercialize immunoglobulin M (IgM) antibody agonists in treating cancer and immunology/inflammation targets. IGM is getting $150 million up front once the deal closes, which the company expects to happen in the second quarter of 2022.