Clinical characteristics and prognostic factors of primary malignant cardiac tumors

Primary malignant cardiac tumors(PMCTs)are rare but highly lethal,and up to 75%of them are sarcomas,followed by lymphoma and mesothelioma.[1]Due to the rarity of this disease,most studies to date were small series or single case report.Although a few of them investigated the clinical characteristics and survival of PMCT patients,the factors influencing overall survival have not been well elucidated.[2,3,4]The Surveillance,Epidemiology,and End Results(SEER)program covers about 28%of the US population,collecting data on patient demographics,primary tumor site,tumor morphology,stage at diagnosis,survival,and mortality,including rich data of cardiac tumors.[5]In the present study,we described the clinical characteristics,identified the variables affecting the prognosis,and constructed a nomogram for patients with PMCTs using the data from the SEER database.