The International Prognostic Index (IPI) is a widely used prognostic tool in the field of oncology. It is used to assess the prognosis of patients with malignant lymphoma and helps determine the best course of treatment. Synonyms for IPI include lymphoma prognostic index, lymphoma risk assessment score, and Lymphoma International Prognostic Index. Other terms that may be used interchangeably with IPI include disease stage, tumor grade, and clinical risk factors. Overall, the goal of these prognostic tools is to provide healthcare professionals with the information they need to make the best treatment decisions for their patients with malignant lymphoma.