collateral circulation COM chronic otitis media 慢性中耳炎(耳科学),cyclophosphamide,Oncovin(vincristne),and MeCCNU(semustine)环磷酰胺、长春新碱和赛氮芥(化疗方案),cyclophosphamide,Oncovin,methotrexate 环磷酰胺、长春新碱、氨甲喋呤(化疗方案)