Using DNA taken from cancerous cells,Ahrendt and colleagues at the Johns Hopkins School of Medicine studied 105 patients with lung cancer,including 10 who never smoked cigarettes.

• 通过从癌细胞中提取的DNA，阿伦特和约翰·霍普金斯医学院的同僚们研究了105名肺癌患者，其中包括10名从不抽烟者。