This research study examines the safety and feasibility of aspirin with or without Simvastatin in solid tumor patients at risk for VTE (Venous Thromboembolism - or blood clots - in the arms, lets, lungs, or other part of the body). One-fifth of all thrombotic (clotting) events occur in patients that have cancer. Changes in sP-selectin will be used as a measure of efficacy. We have chosen sP-selectin as the primary marker because of its role in hemostasis, because it is predictive of thrombosis in cancer patients and because of promising preliminary data. We expect that sP-selectin levels will be elevated in patients before therapy with aspirin and/or statin, but that these levels will fall significantly during treatment, rise during the observation phase, and fall during the second study period. Patients who take part in the study have been diagnosed with a solid tumor cancer and are considered to be intermediate to high risk for VTE. The standard of care is to give chemotherapy for solid tumors and treat clots which develop using blood thinners.

Objectives

Primary: To determine efficacy of aspirin with and without simvastatin in solid tumor patients at high- or intermediate-risk for VTE, in reducing markers of platelet activation, levels of inflammatory and angiogenic cytokines measured using high-throughput approaches, and clinical and investigational measures of hemostatic activation.

Secondary: To determine safety and feasibility of aspirin with or without simvastatin in solid tumor patients at high- or intermediate-risk for VTE

Inclusion Criteria:

• Histologic diagnosis of malignancy of a solid organ or lymphoma
• Planned to initiate a new systemic chemotherapy regimen (including patients starting on first chemotherapy or patients previously treated but starting on a new regimen)
• VTE Risk Score ≥1
• Written, informed consent.

Exclusion Criteria:

• Hematologic malignancies including acute and chronic leukemias, myelodysplastic syndromes, lymphoma and myeloma
• Primary brain tumors
• Active bleeding or high risk of bleeding in the opinion of the investigator
• Hepatic dysfunction (elevated transaminases or bilirubin > 3 times normal)
• Planned stem cell transplant
• Life expectancy < 6 months
• Acute or chronic renal insufficiency with creatinine clearance < 30 mL/min
• Pregnancy
• Known allergy to or prior intolerance of aspirin and/or simvastatin.
• Ongoing anticoagulant, statin and/or anti-platelet therapy.