Prospective Evaluation of the Treatment of Cancer Associated Superficial Venous

Inclusion Criteria: * Patient over 18 * Patient affiliated to a social security scheme * Patient who understands French * Patient with superficial venous thrombosis of the lower and upper limbs confirmed by a Doppler ultrasound less than one month old. * Patient with active cancer: * Cancer treatment within the last 6 months, * Detectable tumor disease, cancer treatment within the last 6 months, ongoing hormone therapy for cancer, palliative cancer. * The patient has received potentially non-curative cancer treatment (notably palliative chemotherapy). * Progression shows that the cancer treatment was not curative (due to recurrence or progression under treatment) (particularly in the case of recurrence after surgery) Exclusion Criteria: * Patients under legal protection * Patients with concomitant pulmonary embolism * Patient with proximal or distal deep vein thrombosis * Patient treated with anticoagulant therapy for another indication * Patient with a contraindication to anticoagulation: Thrombocytopenia less than 30,000 elements/mm3, active bleeding or history of severe bleeding. * Patient opposed to participation in research