Some of the factors that were considered to be at risk for developing thrombosis were aPL positivity (OR 3.22, P < 10(−9), OR 1.26 per 5 years, and P = 0.027 × 10(−7)), immunomodulating medication use (OR 1.40, P = 0.011), nephritis (OR 1.35, P = 0.036), and smoking (OR 1.26, P = 0.011). This evidence concerns the gene FASLG and deep vein thrombosis.