In lung cancer, a mutation on the gene EGFR has been found. The incidence of this mutation among non-smoking female Han Chinese lung cancer patients in Southeast Asia is 60 % or higher, whereas in Western countries it is only about 15 %. The oral medication Iressa is very effective at treating lung cancer linked to this mutation.
肺癌也找到了一個變異基因── EGFR（在東南亞漢族、不抽煙女性的肺癌患者中，此基因變異比例高達 60％以上，西方國家卻只有 15％左右），口服藥物 Iressa 對此基因變異的肺癌很有療效。