The purpose of this study is to determine whether HGF serum concentration might be raised in vivo by administering nadroparin given with prophylactic purpose to gynecological patients.
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Inclusion Criteria: * ≥ 18 years * ECOG PS ≤ 1 * Neutrophils ≥ 1500 l -1, platelets ≥ 150,000 l -1, creatinine 0.6 to 1.2 mg dl -1, total bilirubin ≤ 1 mg dL -1, AST ≤ 35 U l-1, ALT ≤ 45 U l-1 For patients in the study group: high-moderate risk of deep vein thrombosis (for the administration of LMWH for 30 days after surgery) under general anesthesia\> 30 minutes, laparoscopy + at least one risk factor (age\> 40 years, obesity, varicose veins, previous episode of deep vein thrombosis and / or pulmonary thromboembolism, thrombophilia, malignancy, prolonged immobility, congestive heart failure) Exclusion Criteria: * severe liver and renal disease * diabetes * hyperlipidemia * marked osteoporosis * HIV infection * ongoing treatment with: immunosuppressive therapies, contraceptives, lipid-lowering drugs, NSAIDs, antiplatelet drugs, recent acute inflammatory or infectious (\<3 weeks) * a history of allergies, * drug possible confounding, caffeine, tobacco, ethanol (must not have been hired in the last 24 hours prior to sampling) * high risk of bleeding: peptic ulcer, history of hemorrhagic stroke, or bleeding disorders, severe hypertension, cerebral aneurysms, arteriovenous malformations, brain metastases