To assess the potential growth-stimulating effect of GM-CSF on histiocytic sarcoma cells (DH82 cells), the presence of the GM-CSF receptor (CD116) was investigated in non-infected DH82 cells and DH82 cells persistently infected with CDV-Ond, CDV-Ondneon, and CDV-Ondneon-GM-CSF. The gene discussed is CSF2; the disease is histiocytic sarcoma.