Determination of RAS Mutation Status in Liquid Biopsies in Subjects With RAS Wild-type.PERSEIDA Study

Arms (2)

1. label

   RAS wild-type subjects

   description

   The blood samples will be collected according to the site's routine clinical practice usually prior to each treatment cycle and at the follow-up visits. Analysis of the RAS mutation status will be carried out on blood samples taken at baseline, on those carried out at 20 +/-2 weeks after the start of treatment (in any case, prior to the second tumour assessment) and on the sample obtained upon progression, coinciding with routine clinical practices for collecting blood. Blood Samples will be collected to all subjects participating (119 subjects.)Objective to evaluate the RAS mutation status at baseline in liquid biopsies in subjects with RAS wild type metastatic colorectal cancer.

2. label

   Patient RAS WT

   description

   As in cohort 1 blood samples will be collected for all subjects participating (119) 10 ml will be used for analysis of the RAS mutation status. The mutation status of BRAF and EGFR will be also analysed with the IdyllaTM (Biocartis) tests in this Cohort 2. In 20 patients included in Cohort 2, 10 ml additional taken at baseline will be used in order to determine the RAS mutation status by the BEAMing technique and 10 ml additional taken at disease progression will be used to determine the mutational profile in genes other than RAS by a NGS technique.

Primary outcomes (1)

1. measure

   Detection rate of RAS mutations in liquid biopsies in subjects with RAS wild-type mCRC at baseline.