It’s a battle of two heavyweights in this trial report from the Journal of Clinical Oncology, sharing the results of acalabrutinib (Calquence) compared to ibrutinib (Imbruvica) in treating chronic lymphocytic leukemia (CLL). Selected events of clinical interest included cardiac events, atrial fibrillation, ventricular tachyarrhythmias, hypertension, bleeding and major bleeding events, infections, and second primary malignancies excluding non-melanoma skin cancers.