Chen Y, et al. - In this retrospective analysis of ST-segment elevation myocardial infraction (STEMI) patients receiving late percutaneous coronary intervention (PCI), researchers assessed the value of admission cystatin C level as a predictor for long-term mortality. From eight PCI-capable hospitals in Northwest China, 716 STEMI patients who received late PCI were recruited and patients' medical records were analyzed. On the basis of receiver-operating characteristic analysis, cystatin C level ≥1.105 mg/L was deemed as the best predictor of long-term mortality. A higher long-term all-cause mortality and a higher cardiac mortality was observed in the high cystatin C group vs the low cystatin C group. Findings revealed that long-term mortality in STEMI patients undergoing late PCI was independently predicted by high cystatin C level at admission.