Macrophages have diverse effects on tumor biology, including neovasculariza
tion, growth rate, and stroma formation. Tumor-associated macrophages (TAMs
) represent a major subpopulation of the mononuclear leukocytes present in
malignant ascites of ovarian cancer patients. TAMs appear to participate in
the immunologic antitumor defense mechanism through cytotoxic activities,
such as direct cellular cytotoxicity and the release of cytokines, and may
represent key targets for a variety of therapeutic interventions.