Ibrutinib, sold under the brand name Imbruvica among others, is a small molecule drug that inhibits B-cell proliferation and survival by irreversibly binding the protein Bruton's tyrosine kinase (BTK). Blocking BTK inhibits the B-cell receptor pathway, which is often aberrantly active in B cell cancers. Ibrutinib is therefore used to treat such cancers, including mantle cell lymphoma, chronic lymphocytic leukemia, and Waldenström's macroglobulinemia.ref name="a5">"Imbruvica- ibrutinib capsule Imbruvica- ibrutinib tablet, film coated". DailyMed. 8 April 2020. Retrieved 21 April 2020.</ref>[5][6]


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