**2. History of cancer-associated thrombosis**

French physician Armand Trousseau first described the relationship between cancer and thrombosis when he reported multiple cancer patients complicated with "phlegmasia alba dolens" caused by deep vein thrombosis in 1865 [5]. He speculated that excess of fibrin and hypercoagulable state of blood caused thrombosis in these patients. Two years later, he suffered from "phlegmasia alba dolens," and he died from gastric cancer. Since then, many studies have revealed the relationships between cancer and thrombosis. Presently, it is well known that thrombosis, i.e., venous thromboembolism (VTE), arterial thrombosis, disseminated intravascular coagulation, and thrombotic microangiopathy, often occurs in cancer patients, and thrombosis occurring in cancer patients become to be recognized as cancer-associated thrombosis (CAT) (**Table 1**).

**Table 1.** *Cancer-associated thrombosis.*
