MRC1 and neoplasm: To investigate the correlation between infiltration of tumor-associated macrophages and Peptostreptococcus anaerobius in cervical cancer, we performed IHC staining to detect the M2 macrophage marker CD206 in cervical cancer tissues derived from women with Peptostreptococcus anaerobius and cervical cancer tissues derived from women without Peptostreptococcus anaerobius.