Please select the eligibility criteria that correspond to the clinical trial below.
Title: Prophylaxis of Thrombosis With Implantable Devices for Central Venous Access in Cancer Patients : Phase III Randomised Study
Brief Summary: This is a Phase III open-labed, multicenter, prospective, randomised study, and comparative 3-arms of 140 patients (i.e. 420 total patients).

Study period (date of first inclusion/last inclusion): 3 years Treatment period : 3 months


Options:
A: Inclusion Criteria:

* A histologic diagnosis of malignancy;
* At planned initiation of a new systemic chemotherapy regimen (including patients starting on first chemotherapy or patients previously treated but starting on a new regimen);
* A risk score for VTE ≥3 \[assign score of 2 for very high risk sites of cancer (stomach, pancreas), score of 1 for high risk site (lung, lymphoma, gynecologic, bladder, testicular) and score of 0 for all other sites\], hemoglobin \<10 g/dL or planned use of erythropoiesis stimulating agents, platelet count ≥350,000/mm3, total leukocyte count \> 11,000/mm3 or body mass index ≥ 35 kg/m2\]. Any counts meeting criteria drawn within 2 weeks prior to enrollment are considered acceptable.
* Age 18 years or older
* Provide written, informed consent.

Exclusion Criteria:

* Active bleeding or at high risk of serious bleeding complication in the opinion of the investigator
* Diagnosis of primary brain tumor multiple myeloma, leukemia, or myelodysplastic syndrome
* Planned stem cell transplant
* Life expectancy \< 6 months
* Known allergy to heparin or LMWH
* Patient or caregiver incapable of daily self-injection
* Acute or chronic renal insufficiency with creatinine clearance \< 30 mL/min
* History of heparin-induced thrombocytopenia
* Allergy to contrast agents
* Pregnancy
* Need for anticoagulant therapy
* Platelet count \< 75,000/mm3
B: Inclusion Criteria:

* First line chemotherapy for solid tumor with:
* Metastatic disease or
* Involved nodes or
* Unresectable tumor
* Indication for Implantable device for central venous access
* Potential survival \> 3 months
* ECOG performance status 0 to 2 (WHO)
* Age between 18 and 75 years.
* Social security guaranteed
* Normal laboratory assessments (platelets\> 100000/mm3, TP 60%, spontaneous TCA with M/T\<1.5, TGO and TGP \< 2xN, serum creatinin\<120µmol/l)
* Informed consent signed

Exclusion Criteria:

* Inability to understand informed consent or interfering with compliance for treatment or protocol Anti-coagulant treatment -related criteria
* Acute infectious endocarditis
* History related with heparin allergy or thrombopenia due to heparin
* Uncontrolled high blood pressure (systolic blood pressure \>180 mm Hg and/or diastolic blood pressure \>110 mm Hg)
* Hemorrhagic syndrome ongoing
* Patient with platelet inhibitors treatment
* Chronic, daily treatment with anti-coagulant therapy (LMWH or AVK), use as preventive or curative level
* Patient with liver failure (TP\<60%) or renal insufficiency (creatinin clearance\< 20 ml/mn)
* Women with pregnancy and lactating Pathology-related criteria
* deep venous thrombosis history or pulmonary embolism (\< 6 months)
* Clinical suspicious of brain metastasis
C: Inclusion criteria:

Inclusion_Criteria

* Acute symptomatic deep vein thrombosis (DVT)
* Pulmonary embolism (PE) 3-12 months prior to screening, which has been documented by objective testing

Exclusion criteria:

Exclusion_Criteria

* Symptomatic DVT or PE at screening Interruption of anticoagulant therapy for 2 or more weeks during the 3-12 months of treatment for the prior VTE.
* Patients who in the investigators judgement are perceived as having an excessive risk of bleeding Elevated Aspartate aminotransferase (AST) or Alanine tranminase (ALT) \> 2x ULN
* Severe renal impairment (estimated creatinine clearance \<= 30 ml/min)
D: Inclusion Criteria:

* Consecutive patients who had
* planned laparoscopic surgery for
* colorectal cancer will be included in the study provided no exclusion criteria will be found

Exclusion Criteria:

* age \< 18 years
* surgery for non-cancer disease
* duration of surgery \< 45 min
* other indication for anticoagulant therapy
* known cerebral metastases
* kidney or liver failure
* known hemorrhagic diathesis or high risk for bleeding
* history of intracerebral bleeding or neurosurgery within 6 months, history of heparin induced thrombocytopenia
* pregnancy or lactation
* refusal of informed consent.

Answer: B