医生对肺癌往往诊断过迟 ,使病人丧失及时手术的机会 .现在研究者发现 ,引起 2个抗癌基因畸变的ＤＮＡ高甲基化可帮助早期诊断肺癌 .研究者在二十世纪 70年代 ,从 2 1个患有鳞状细胞癌的病人取得痰样品进行检查 ,这些病人中有些已诊断为肺癌 ,有些则尚未诊断为肺癌 .所有这些人 Doctors often diagnose lung cancer too late and make patients lose opportunities for timely surgery. Now researchers have discovered that hypermethylation of DNA that causes two anti-cancer gene aberrations can help early diagnosis of lung cancer. Researchers in the 1970s, from 2 1 A patient with squamous cell carcinoma obtained sputum samples for examination. Some of these patients had been diagnosed with lung cancer, while others had not yet been diagnosed with lung cancer. All these people