Mulige risikofaktorer inkluderer planocellulær histologi, behandling med antireumatiske/ anti- inflammatoriske lægemidler, behandling med antikoagulantia, tidligere strålebehandling, Avastinbehandling, aterosklerose i anamnesen, central placering af tumor og kavernedannelse i tumorer før eller under behandling.
Possible risk factors include squamous cell histology, treatment with antirheumatic/ anti-inflammatory drugs, treatment with anticoagulants, prior radiotherapy, Avastin therapy, previous medical history of atherosclerosis, central tumour location and cavitation of tumours prior to or during therapy.