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MA08 - Treatment Monitoring in Advanced NSCLC (ID 386)
- Event: WCLC 2016
- Type: Mini Oral Session
- Track: Advanced NSCLC
- Presentations: 1
MA08.09 - Monitoring Plasma EGFR Mutations during First Line Treatment with EGFR TKIs in NSCLC Patients (ID 4547)
11:00 - 12:30 | Author(s): U. Janzic
Genotyping cell free circulating DNA (cfDNA) is a non-invasive method of detecting EGFR mutations (EGFRmu) in plasma and may provide an option to identify patients who progress while treated with EGFR TKIs. The aim of our study was to monitor plasma EGFRmu and identify dynamic case specific changes in plasma EGFRmu during routine treatment of advanced EGFRmu NSCLC patients.
Plasma was collected from patients with advanced EGFRmu NSCLC treated with first- or second-generation EGFR TKIs. Plasma EGFRmu were dynamically monitored consecutively at every scheduled visit. Cobas EGFR Mutation Test v1 and v2 (Roche, USA) was used to detect 42 mutations at EGFR gene in exons 18 to 21. Liquid biopsy progression (LBP) was determined as reappearance of EGFRmu in plasma after negativisation during treatment or increase of EGFRmu levels expressed by semi-quantitative index (SQI). Radiologic progression was determined in accordance with RECIST1.1 criteria.
From May 2014, 23 patients were treated with EGFR TKIs for advanced EGFRmu NSCLC; 20/23 had detectable activating mutations in plasma before any treatment and were therefore included in our analysis. Dynamic changes of plasma EGFRmu during 1[st] line EGFR TKI treatment are shown in Figure 1. Eight patients (40%) experienced RECIST 1.1 progression while on treatment, whereas one patient was inevaluable. In 4/8 patients (50%) LBP appeared at the same time as radiologic progression, in 3/8 patients (37%) LBP appeared before radiologic progression (8w, 14w, 20w before, respectively) and in 1 patient (12%) radiologic progression appeared 6w before LBP. Among patients who did not experience radiologic progression yet, some dynamic changes in cfDNA were also observed, but alterations in the SQI values were much smaller. Figure 1
Monitoring EGFR mutations in plasma is a feasible and less invasive method in routine clinical practice and could be used as a predictive marker of progression on treatment with EGFR TKIs.
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