avapritinib
(AY-vah-PRIH-tih-nib)
A drug used to treat adults with advanced systemic mastocytosis or certain types of gastrointestinal stromal tumors. It is also being studied in the treatment of other types of cancer. Avapritinib blocks certain proteins, which may help keep cancer cells from growing. It is a type of tyrosine kinase inhibitor. Also called Ayvakit.