Active surveillance and retrospective analysis is in place. 已经落实积极监测和回顾性分析。
Methods Two groups of airway pathologically proved neoplasma were retrospectively reviewed for the different endobronchial intervation modalities. 方法回顾性分析两组经病理明确的气道内恶性肿瘤，分别采取两种不同的气管镜治疗模式。
