IL6 and COVID-19: Since they also reported that the increased lipoprotein (a) was positively correlated with IL-6 (r = 0.44, 95% CI: 0.30–0.56, P < 0.001), elevated IL-6 not associated with venous thromboembolism, it provided a new idea for us to explore the role of IL-6 in the progression of VTE in patients with COVID-19 that elevated lipoprotein (a) is a potential cause of venous thromboembolism and elevated IL-6.