Definition

A drug used with capecitabine or letrozole to treat certain types of HER2-positive breast cancer that are advanced or have spread. It is also being studied in the treatment of other types of cancer. Tykerb blocks EGFR and other proteins, which may help keep cancer cells from growing. It is a type of tyrosine kinase inhibitor. Also called GW572016 and lapatinib ditosylate.