Figure 2

Prognostic value of KRAS status analysed either in tumor tissue or plasma samples by PNA-PCR. According to analyses of tumor tissue and plasma, KRAS status of each patient was categorized as: negative (KRAS wild type in tumor and matched plasma samples), discordant, (KRAS status discordant in tumor and matched plasma samples); positive (KRAS mutated either in tumor tissue and matched plasma samples.