如果把versus翻译为“比”，“与。。。相比”， 那么这个句子就不是A与B的比较，而是含有A与C (TREATED WITH doublet chemotherapy)和B与C，再把A与B进行比较。这样翻译就太乱了。

经查，versus 的另外一个解释是As the alternative to or in contrast with。因此，可以考虑这样翻译：


相较于双重化疗来说(或译为：作为取代代双重化疗的一种治疗方法)，接受厄洛替尼治疗的EGFR突变呈阳性患者， 比报道中的接受吉非替尼治疗的同类患者的PFS and response rates要好。

英文句子有省略。如果写完整，应为：PFS and response rates for EGFR M+ patients treated with erlotinib versus doublet chemotherapy are better than that reported for EGFR M+ patients treated with gefitinib (versus doublet chemotherapy).



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Note added at 3 hrs (2010-09-06 17:15:15 GMT)
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另外一种可能性：

A：EGFR M+ patients treated with erlotinib versus doublet chemotherapy are better than that reported for EGFR M+ patients treated with gefitinib

C：EGFR M+ patients treated doublet chemotherapy

B：EGFR M+ patients treated with gefitinib

A与C都比B效果好。



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Note added at 3 hrs (2010-09-06 17:16:32 GMT)
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to clarify：

A：EGFR M+ patients treated with erlotinib
B：EGFR M+ patients treated doublet chemotherapy
C：EGFR M+ patients treated with gefitinib

A与B都比C效果好。



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Note added at 5 hrs (2010-09-06 18:21:38 GMT)
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可否这样理解：双重化疗就是erlotinib + gefitinib， 因此：

相较于双重化疗来说, 单用厄洛替尼治疗EGFR突变呈阳性患者， 比报道中的单用吉非替尼治疗同类患者的PFS and response rates要好。