Comparison of Thromboembolic Events in Patients Undergoing Thromboprophylactic Treatment With ENOXA® vs Lovenox®

Inclusion Criteria: * Male or female over 18 years * Gastrointestinal (GI) Cancer * Elective or emergency surgery * Preventive administration of enoxaparin sodium Exclusion Criteria: * Patients participating in another study * Unfractionated heparin (UFH) use up to 30 days prior to surgical procedure * Renal failure with creatinine clearance \<30 ml / min * Known history of peripheral venous thrombosis and/or deep venous thrombosis in the 3 months prior to inclusion * Pregnant or breastfeeding women or women of childbearing age not using medically accepted contraceptive method * Anticoagulant use in the 3 months prior to inclusion * Patients with known haemostatic disorder * Patients not consenting to participate in the study, or not capable of understanding its objectives