Ibrutinib Products | Cleanchem - Ibrutinib is a Bruton's tyrosine kinase (BTK) inhibitor used to treat various types of cancer, including chronic lymphocytic leukemia (CLL) and mantle cell lymphoma. It works by blocking BTK, an enzyme essential for B-cell receptor signaling, thereby inhibiting the growth of malignant B-cells. It is taken orally and has shown effectiveness in targeting specific cancer pathways.