T-cell engager company Kali Therapeutics Inc. licensed its lead product, CD19/BCMA/CD3 trispecific antibody KT-501, to Sanofi SA in a global deal that could be worth more than $1.2 billion. The San Mateo, Calif.-based biotech first emerged in 2024 and moved KT-501 into a phase Ia trial last week to treat adults with rheumatoid arthritis.