This correlates with our previous analysis [17]. This study has several limitations. It is retrospective in nature, with significant patient heterogeneity, includes only a small number of cases, and not all specimens were appropriate for molecular analysis (a common finding in several NSCLC studies [12]). We have also combined patients treated with gefitinib and erlotinib. Despite these limitations EGFR status was once again PX-478 manufacturer demonstrated to be a predictor for disease control and PFS, and KRAS a poor predictive marker. Although our study did not identify any other provisional candidate biomarker of response or resistance, due to the small size of the study and the inevitable

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