An inhibitor of chemotaxis and phagocytosis in reticulum cell sarcoma

In a study of neutrophil functions in haematological disorders using in vitro techniques, a heat-stable inhibitor of chemotaxis and phagocytosis was demonstrated in the plasma and serum of a 64-year-old woman with reticulum cell sarcoma. In partial purification by chromatography, the inhibitor activity could not be separated from IgG. Clinically the patient did not exhibit abnormal susceptibility to infections.