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Venous thromboembolism (VTE) is a significant cause of death in patients suffering from cancer. Indeed, many publications have shown that professional practice recommendations for VTE care in these patients were not well followed. This evaluation of professional practices aimed to understand the physicians’ knowledge level about the recommendations for the management of thromboembolic events for patients suffering from cancer. On the one hand, focus was made on prescription compliance in terms of the anticoagulant therapy, its prescribed dose, and its time limit, based on SRO-INCa recommendations. On the other hand, the evaluation aimed to assess hospital discharge letter compliance compared to HAS recommendations. Following the first trial results in 2017, an information leaflet for patients and a reminder leaflet for physicians were created. Furthermore, a hospital discharge letter model was created in order to harmonize this document for all physicians and to prevent them from leaving items out. The obtained results on professional practices between 2019 and 2021 showed a lack of knowledge about recommendations: 51% of compliance on prescriptions in 2020. There was also room for improvement in terms of hospital discharge letter compliance, with the time limit for the TEV treatment not detailed in 59.5% of the discharge letters. The results obtained over the last three years are still insufficient and lead us to keep working on physician training and awareness, enhancing information dissemination, and thinking about new tools to help our medical teams.