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Doctors discuss that while cardiovascular side effects like atrial fibrillation and hypertension in patients with chronic lymphocytic leukemia are concerns with BTK inhibitors, they are manageable and should not deter prescribing these effective therapies; generally, atrial fibrillation is considered more challenging to manage than hypertension.

In the Phase 2 MOUNTAINEER-01 study of patients with HER2-positive metastatic colorectal cancer who were chemo-refractory, the combination of tucatinib and trastuzumab showed an impressive response rate and disease control rate, and median duration of response up to 12 months; Dr. Ahn notes these results compare favorably to prior studies of dual HER2 inhibition, with MOUNTAINEER-01 showing higher response rates.

Ricardo Parrondo, MD, explains that different BTK inhibitors have varying rates of cardiovascular side effects in patients with chronic lymphocytic leukemia, suggesting the choice between them should consider a patient's preexisting cardiovascular conditions, with acalabrutinib favored for hypertension concerns and zanubrutinib for atrial fibrillation issues.