Sanofi SA (NASDAQ:SNY) on Monday agreed to acquire Blueprint Medicines Corporation (NASDAQ:BPMC). The acquisition includes a rare immunology disease medicine, Ayvakit/Ayvakyt (avapritinib), approved in the U.S. and the EU, and a promising advanced and early-stage immunology pipeline. Ayvakit/Ayvakyt is the only approved medicine for advanced and indolent systemic mastocytosis (ASM & ISM), a rare immunology disease, which is characterized by the accumulation and activation of aberrant mast cells