AbbVie has 47 reasons for its $2B cancer immunotherapy partnership with I-Mab

The drugmaker said Friday that it would partner with Shanghai-based I-Mab on the development of lemzoparlimab, a drug that targets CD47. The antigen target, also known as the "don't eat me" signal, is a growing area of immunotherapy, as illustrated by Gilead's $4.9 billion buyout of Forty Seven in March.