Fig. 1From: International pilot external quality assessment scheme for analysis and reporting of circulating tumour DNAOverview of the participating countries to the pilot EQA scheme. United Kingdom: One laboratory received both RAS (KRAS/NRAS) and EGFR samples but did not submit results for KRAS/NRAS as they were in the process of validation. In total, 23 participants tested the samples for KRAS/NRAS analysis, and 31 participants for EGFR analysisBack to article page