Subjects will have an active malignancy defined as any of: a) diagnosis of cancer (excluding basal cell or squamous cell carcinoma) within 18 months of study enrolment; or b) have received treatment for cancer within 18 months (e.g. radiation therapy, chemotherapy, adjuvant therapy) of study enrolment; or c) have documented recurrent or metastatic cancer. Subjects must also have a first episode of objectively confirmed VTE (distal or proximal deep vein thrombosis (DVT) of the lower limb or proximal DVT of the upper limb, or pulmonary embolism (PE)) that is being treated with therapeutic anticoagulation for a minimum intended duration of 3-6 months. Subjects must be ≥18 years of age with a life expectancy of > 6 months.