Cancer Associated Thrombosis : What is the Proportion of Patients Ineligible to a Study as CARAVAGGIO

data collection : gender, weight, biological data (platelets, hemoglobin, creatinine, liver function tests), performance status, type of Venous Thromboembolic Event (VTE) and cancer, anticancer and anticoagulant therapy, adverse events (bleeding, recurrence of Venous Thromboembolic Event (VTE), death) up to 6 months after their Venous Thromboembolic Event (VTE).