Neil Kay, MD, Mayo Clinic, Rochester, MN, talks on discontinuation of Bruton’s tyrosine kinase inhibitors (BTKi) for intolerance and disease progression in patients with chronic lymphocytic leukemia (CLL). Although some patients discontinue BTKi for persistently bothersome, but not life-threatening, adverse events, there also are significant adverse events such as hypertension and atrial fibrillation. BTKi intolerance has been evaluated extensively, with evidence suggesting that intolerance, rather than progression, can be a dominant reason for discontinuation, particularly of ibrutinib. This interview took place at the Lymphoma, Leukemia & Myeloma Congress 2021.