Tac+MPA+Pred+HCQ was associated with increased risk of ventricular arrhythmias (13.5% vs. 11.4%; aHR,1.02 1.54 2.31 , p=0.04) and pancytopenia (35.9% vs. 31.4%; aHR,1.03 1.311.68 , p=0.03) compared to triple immunosuppression without HCQ.