Immune checkpoint inhibitors (ICI) have revolutionized cancer treatment and are now approved for various types of cancer. The most common side effects of ICI are immune-related adverse events which can affect any organ or system in the body. Recently, concerns have also risen about cardiovascular effects of ICI. Retrospective studies showed an 4-5 times increased risk of developing an arterial thromboembolic event. The mechanisms driving the ICI-associated risks of arterial thromboembolic events such as myocardial infarction and stroke, are unclear. Since the risk of a thromboembolism appears to be increased already during the first months after initiation of ICI, immune-related hypercoagulability or (autoimmune) antiphospholipid antibodies may play a role, but data to support this are lacking. The longer-term risk of arterial thromboembolism may be predominantly driven by (accelerated) atherosclerosis, a chronic low-grade inflammatory disease of the larger arteries. Therefore, this study evaluates the effect of ICI on progression of coronary non-calcifid plaque volume by using computed tomography angiography (CCTA).