Thromboprophylaxis With Rivaroxaban In Patients With Malignancy and Central Venous Lines

Inclusion Criteria: 1.Patients 18 years of age or older with a new or existing diagnosis of cancer with a CVC inserted within the last 72 hours. Exclusion Criteria: 1. CVC in place for \>72 hours 2. Patient requires anticoagulation for other indication 3. Concomitant use of dual antiplatelet therapy 4. Prior VTE 5. Major bleeding event in the last 6 weeks 6. Patient on concomitant medication with known interaction with rivaroxaban (eg. CYP3A4 inhibitor) 7. Pregnancy (documentation of use of effective contraception if sexually active or negative B-Hcg required) 8. Known renal failure, based on Creatinine clearance \<30 mL/min (Cockcroft-Gault) (in the previous 3 months) 9. Documented severe liver disease (eg. acute clinical hepatitis, chronic active hepatitis, cirrhosis or ALT \>3ULN) ( in the previous 3 months) 10. Known thrombocytopenia \< 50x 109/L (in the previous 3 months) 11. Allergy to rivaroxaban 12. Life expectancy \<6 months 13. History of condition at increased bleeding risk including, but not limited to: 1. Major surgical procedure or trauma within 30 days before the randomization visit 2. Clinically significant gastrointestinal bleeding within 6 months before the randomization visit 3. History of intracranial, intraocular, spinal, or atraumatic intra-articular bleeding 4. Chronic hemorrhagic disorder 5. Known intracranial neoplasm, arteriovenous malformation, or aneurysm 6. Sustained uncontrolled hypertension: systolic blood pressure ≥180 mmHg or diastolic blood pressure ≥100 mmHg 14. Primary malignancy diagnosis of basal cell or squamous cell carcinoma of the skin or acute leukemia or myelodysplastic syndrome 15. Geographic inaccessibility 16. Refused or unable to obtain consent