Cancer Patients Have a Higher Risk of Thrombotic and Ischemic Events After Percutaneous Coronary Intervention

Objectives: This study sought to define the risk of stent thrombosis (ST) and myocardial infarction (MI) in cancer patients compared with noncancer patients after percutaneous coronary intervention (PCI). Background: Cancer patients are considered to be at high thrombotic risk, but data on whether this is the case after PCI remain inconclusive. Methods: Cancer patients undergoing PCI at Mayo Clinic Rochester from January 1, 2003, to December 31, 2013, were identified by cross-linking institutional cancer and PCI databases and by propensity score matching to noncancer patients. The combined primary endpoint was all-cause mortality, MI, and revascularization rate at 5-year follow-up. Secondary endpoints were the individual primary endpoint components, cause of mortality, ST, and Bleeding Academic Research Consortium 2+ bleeding. Results: The primary endpoint occurred in 48.6% of 416 cancer and in 33.0% of 768 noncancer patients (p < 0.001). In competing risk analyses, cancer patients had a higher rate of noncardiac death (24.0% vs. 10.5%; p < 0.001) and a lower rate of cardiac death (5.0% vs. 11.7%; p < 0.001). Cancer patients had a higher rate of MI (16.1% vs. 8.0%; p < 0.001), ST (6.0% vs. 2.3%; p < 0.001), repeat revascularization (21.2% vs. 10.0%; p < 0.001), and bleeding (6.7% vs. 3.9%; p = 0.03). The most critical period for ST in cancer patients was in the first year after PCI. The dual antiplatelet therapy score was predictive of thrombotic and ischemic events in both groups. Conclusions: Cancer patients have a higher risk of thrombotic and ischemic events after PCI, identifiable by a high dual antiplatelet therapy score. These findings have important implications for antiplatelet therapy decisions.