Kinase inhibitors are a broad group of medications used to treat several types of cancer, such as lung cancer, breast cancer, and leukemia. They also have other uses, such as treating graft-versus-host disease. These medications work by blocking specific enzymes called kinases, which help stop the growth and spread of cancer cells (or inflammatory cells). Kinase inhibitors often come as oral pills. Examples include Gleevec (imatinib), Tykerb (lapatinib), Rezurock (belumosudil), and more.