palbociclib
(PAL-boh-SY-klib)
A drug used to treat women and men with certain types of hormone-receptor positive, HER2-negative breast cancer that is advanced or has spread. It is also being studied in the treatment of other types of cancer. Palbociclib blocks certain proteins, which may help keep cancer cells from growing. It is a type of cyclin-dependent kinase inhibitor. Also called Ibrance.