[Mononuclear phagocytes in tumors: differentiation by a rosette technique (author's transl)].

Mononuclear phagocytes in tumors cannot be reliably identified and quantified using morphological criteria alone. For this reason an alternative method, which depends on functional properties is described: Macrophages and monocytes derived from tumors from rosettes with antibody-coated sheep red blood cells and can thereby easily be detected and differentiated from tumor cells.