Leiomyoma and Erythrocytosis: A Tumor Producing a Factor Which Increases Erythropoietin Production. Report of Case

A patient with a leiomyoma of the esophagus and erythrocytosis is reported. Preliminary studies in mice suggest that the tumor contained a substance which was capable of increasing erythropoietin production by the kidneys. Because of the limited amount of tumor available, we were unable to further characterize this substance. We hope that this report will encourage other investigators to repeat and extend these studies.