Agios Pharmaceuticals Inc., a company that has until now revolved primarily around its FDA-approved acute myeloid leukemia drug, Tibsovo (ivosidenib), is selling that drug and the rest of its oncology business to Servier Pharmaceuticals LLC in a deal valued at up to $2 billion, plus royalties. The agreement includes $1.8 billion cash up front for the portfolio and as much as $200 million in regulatory milestone payments for the investigational glioma treatment vorasidenib.