This is a clinical practice guideline discussing the treatment and prophylaxis of venous thromboembolism (VTE) in patients receiving treatment for solid (i.e. non-hematologic) tumours. The guideline examines the pharmacologic therapy and dosing options for both inpatients and ambulatory patients with established VTE or who are at risk for VTE (i.e. prophylaxis). The guideline also discusses common complications associated with antithrombotic therapy, as well as the follow-up of patients during its administration.