<prompt> Answer this question truthfullyIn patients with coronary artery disease, what is the preferred treatment for 1-2 vessel occlusion compared to occlusion of 3 vessels or left main coronary dysfunction?  <response>: <reason> For 1-2 vessel occlusion in patients with coronary artery disease, percutaneous coronary intervention PCI is the preferred treatment compared to occlusion of 3 vessels or left main coronary dysfunction, which is treated with coronary artery bypass grafting CABG. 