Tidligere tilfælde af tromboemboliske hændelser eller samtidig administration af erythropoietiske midler eller andre midler såsom hormonsubstitution kan også øge risikoen for trombose hos disse patienter.
Previous history of thromboembolic events or concomitant administration of erythropoietic agents or other agents such as hormone replacement therapy, may also increase thrombotic risk in these patients.