However, no statistically significant differences were found between PE-positive patients and PE-negative patients in terms of gender, age, chest pain, hemoptysis, hypertension, coronary heart disease, COPD, PT, TT, RBC, PLT, PDW, TP, albumin, and cystatin C (P > 0.05). The gene discussed is CST3; the disease is chronic obstructive pulmonary disease.