Inclusion Criteria:

* Diagnosis of advanced solid tumor cancer, lymphoma, or myeloma (no time restrictions or limitations) -OR- diagnosis of early stage solid tumor cancer, lymphoma, or myeloma <= 12 months prior to study enrollment
* Diagnosis of VTE <= 30 days prior to study enrollment for which potential benefits of anticoagulation therapy to prevent recurrence of VTE are felt by the treating physician to exceed the potential harms

* Any anticoagulation drug/strategy may be used to treat the index VTE; protocol treatment will begin <= 30days after the index VTE diagnosis date
* Treating physician intends to put participant on anticoagulation therapy for at least three months.
* Age >= 18 years
* Platelet count is >= 50,000/mm\^3 (<= 7 days prior to enrollment)
* CrCl (Creatinine Clearance) is >= 15 ml/min (<= 7 days prior to enrollment)

Exclusion Criteria:

* Diagnosis of acute leukemia
* Has ever received or is scheduled to receive an Allogeneic Hematopoietic Stem Cell Transplantation (alloHSCT)

* Patients who have ever received an Autologous Hematopoietic Stem Cell Transplantation (autoHSCT) ARE eligible.
* Patients who are scheduled to receive an Autologous Hematopoietic Stem Cell Transplantation (autoHSCT) are NOT eligible
* Ongoing, clinically significant bleeding (CTCAE grade 3 or 4)
* Ongoing therapy with a P-gp inhibitor (e.g., nelfinavir, indinavir, or saquinavir-protease inhibitors for HIV) as these drugs interact with the factor Xa inhibitors
* Therapy with any azole antifungals (e.g., itraconazole, ketaconazole, voriconazole) at the time of enrollment