As with myocarditis, pericarditis due to anti-PD-1 or anti-PD-L1 monotherapy occurred more frequently compared to anti-CTLA-4 (0.36% and 0.16%, respectively), with an ROR of 2.28 (95% CI: 1.27–4.12) [26]. Here, CTLA4 is linked to myocarditis.