Perforation of an Unsuspected Cecal Granulocytic Sarcoma during Therapy with Granulocyte-Macrophage Colony-Stimulating Factor

Abstract
Granulocytemacrophage colony-stimulating factor (rhGM-CSF) has recently entered clinical trials for patients with bone marrow failure.1 , 2 We are participating in a crossover study comparing the relative effectiveness of intravenous as compared with subcutaneous rhGM-CSF (Immunex, Seattle; distributed by Hoechst—Roussel Pharmaceuticals, Somerville, N.J.) in patients with myelodysplastic syndromes. We report here on a patient in whom necrosis and perforation of a granulocytic sarcoma of the cecum developed during therapy with rhGM-CSF.