癌毒是肺癌“传舍”的根本,具有易伤正气、其性沉伏、发病猛烈、其性善行、易与痰瘀凝结等特性,也是肺癌传变的主要原因.癌毒通过本经顺传、借他经传、借他经逆传、五行相生相克、气-水之道等途径发生转移.另外,癌毒所舍之处必为虚处,癌毒久舍,则正气愈虚,“传舍”趋势愈盛,形成恶性循环.“,”Cancer toxin that are characterized by easy to destroy healthy Qi,deep and hide properties rapid and violent pathogenesis process,dissemination of unfixed location,and easy to interaction with phlegm and stasis,is the main cause of lung cancer.According to science of channels and collaterals,Five-element theory,and visceral outward,the main pathways that lung cancer settling down and metastasis include sequential transmission across the same origin channels (lung meridian),reverse transmission by means of other origin channels,mutual promotion and restraint between the five elements,and by means of Qi passage and water channel transmission.The primary pathogenesis of lung cancer settling down and metastasis is “deficiency susceptible to pathogenic factors”.The location to settling of cancer toxin might be hypo function with pathogenic factors damage first,then the healthy Qi harmed by cancer toxin,furthermore,the healthy Qi deteriorated and exhausted after long-time,settling of cancer toxin.