Liquid biopsy for detecting epidermal growth factor receptor mutation among patients with non-small cell lung cancer treated with afatinib: a multicenter prospective study
BMC Cancer volume 22, Article number: 1035 (2022)
This study aimed to determine the effectiveness of liquid biopsy in detecting epidermal growth factor receptor (EGFR) mutations at diagnosis, disease progression, and intermediate stages.
This prospective, multicenter, observational study included 30 patients with non-small cell lung cancer treated with afatinib, harboring a major EGFR mutation confirmed by tumor tissue biopsy. We collected blood samples for liquid biopsy at diagnosis, intermediate stage, and progressive disease. Tissue and liquid biopsies were examined using Cobas ® EGFR Mutation Test v2.
Liquid biopsy detected EGFR mutations in 63.6% of the patients at diagnosis. The presence of metastasis in the extrathoracic, brain, and adrenal glands correlated positively with the detection of EGFR mutations. Patients with positive EGFR mutations at diagnosis had significantly shorter overall and progression-free survival than patients with negative EGFR mutations. Four of the 18 patients (22.2%) who reached progressive disease had positive EGFR T790M mutations. Three of 10 patients (30.0%) with progressive disease were positive and negative for T790M using tumor re-biopsy and liquid biopsy, respectively. The results of EGFR mutation by tissue re-biopsy were the same as those of liquid biopsy in the three patients who were positive for significant EGFR mutations but negative for the T790M mutation using liquid biopsy at progressing disease. Only two patients were positive for major EGFR mutations at intermediate levels.
Liquid biopsy can be a prognostic factor in EGFR-tyrosine kinase inhibitor treatments at diagnosis. Tumor re-biopsy can be omitted in patients with positive EGFR mutations by liquid biopsy at PD.
Non-small cell lung cancer (NSCLC) accounts for approximately 85% of all lung cancers, and adenocarcinoma is the most common histological type. The incidence of epidermal growth factor receptor (EGFR) mutations among Asian patients with adenocarcinoma is approximately 51.4% . Several phase III trials that compared first-line EGFR-tyrosine kinase inhibitors (TKIs) with platinum combination therapy in patients with NSCLC with EGFR mutations have been reported [2,3,4,5,6]. In these trials, the EGFR-TKIs were associated with better progression-free survival (PFS) and overall survival (OS). Therefore, EGFR-TKIs are recommended as the first-line treatment for patients with NSCLC with EGFR mutations. Afatinib, a second-generation EGFR-TKI, is preferred to chemotherapy in treating patients with NSCLC with EGFR mutations . In a phase IIb study (LUX-Lung7), afatinib improved PFS and time-to-treatment failure (TTF) in most patient categories, except light ex-smokers and, for TTF alone, and patients without brain metastases . Therefore, afatinib is considered one of the standard treatments for EGFR mutation-positive advanced NSCLC.
Following treatment with afatinib, approximately 40% of patients developed the T790M mutation in EGFR exon 20 . For these patients, the administration of osimertinib yielded better outcomes than platinum-pemetrexed therapy . Therefore, detecting T790M during therapy with a first or second-generation EGFR-TKI treatment is important.
Traditionally, tumor tissue samples have been utilized for EGFR testing. However, collecting tumor samples from patients is invasive and sometimes unrepeatable. EGFR gene mutations in blood samples were examined using liquid biopsy. It is a non-invasive method that identifies driver oncogene mutations from cell-free DNA (cfDNA) and can be performed repeatedly . Recently, clinical applications of liquid biopsy using cfDNA have been studied by many researchers for early detection of various cancer [10, 11], surveillance of minimal residual diseases, treatment selection for recurrent diseases , and treatment response assessment .
Therefore, this study aimed to determine if liquid biopsy could substitute tumor biopsy in detecting EGFR mutations and could be used to monitor disease progression in patients on afatinib therapy.
Patients and study design
The inclusion criteria were patients (1) diagnosed with NSCLC, (2) aged ≥ 20 years, (3) who were treatment-naïve, and (4) with a common sensitive EGFR mutation, exon 19 deletion, or L858R mutation in exon 21. Additional inclusion and exclusion criteria are described in Supplementary Tables 1 and 2. All patients signed a written informed consent form. This study followed the guidelines of the Declaration of Helsinki and was approved by the institutional review board at Yokohama City University Hospital (approval number B160804003).
Collection and analyses of EGFR mutation
Tumor samples were obtained following the diagnosis of NSCLC by biopsy before the commencement of afatinib therapy. Additionally, we obtained tumor samples via re-biopsy at the time of progressive disease (PD). Blood samples for liquid biopsy were collected at pre-treatment, intermediate (8 and 10 months after commencement of afatinib therapy in patients with L858R and Ex19del, respectively), and post-PD. DNA extraction was performed using Cobas ® cfDNA Sample Prep for blood samples or Cobas DNA Sample Prep for tissue samples (Roche Molecular Systems, Inc., Pleasanton, CA, USA). After the quality of the extracted DNA was confirmed to meet the requirements of the following test, EGFR testing was performed using Cobas ® EGFR Mutation Test v2 (Roche Molecular Systems, Inc., Pleasanton, CA, USA). The EGFR testing in this study complied with the manufacturer's protocol, and the validation assay was omitted.
Patients were administered 40 mg of afatinib each day until disease progression or intolerable toxicity occurred. Treatment with afatinib can be continued even in patients with PD because treatment interruptions and dose reductions can prevent and manage adverse events (AEs). Despite the best supportive care, dose modifications made for Common Terminology Criteria for Adverse Events grade 3 or persistent grade 2 AEs, we discontinued afatinib until the severity of AEs returned to grade 1 or baseline. Afatinib was re-commenced at a reduced dose of 10 mg increments to a maximum daily dose of 20 mg; otherwise, dosing was permanently terminated at the discretion of the attending doctor.
The primary endpoint was the incidence of EGFR T790M mutation expression in the liquid biopsy of cfDNA. Subsequently, the incidences at pre-treatment, intermediate, and PD of the liquid biopsy were compared with those of tissue biopsy. The secondary outcome was the efficacy and safety of afatinib therapy. PFS was defined as survival without disease progression or death and was calculated as the time from the administration of afatinib until the first observation of disease progression. OS was defined as the time from the initiation of afatinib treatment until death or the last follow-up visit. AEs were recorded by the investigator at pre-treatment and each visit according to the National Cancer Institute Common Terminology Criteria for Adverse Events (version 4.0).
Associations between clinical characteristics and the treatment response to afatinib were analyzed using Fisher's exact test or the chi-square test. Survival analysis was performed using Kaplan–Meier estimation to assess differences between the groups. Statistical significance was set at P ≤ 0.05. All statistical analyses were performed using JMP Pro 15.0 (SAS Institute Inc.).
This prospective observational study enrolled 30 patients between August 2016 and April 2021. Baseline characteristics and safety data were analyzed in an intention-to-treat (ITT) population. The patient characteristics are summarized in Table 1. The median age of the patients was 69.0 years (range 54–82). Pathologically, 28 (93.3%) patients had adenocarcinoma, and two (6.6%) had adenosquamous carcinoma. Regarding performance status, 22 (73.3%), six (20.0%), and two (6.6%) patients had Eastern Cooperative Oncology Group performance status scores of 0, 1, and 2, respectively. Regarding clinical stages, two patients were stage IIIB, 21 patients were stage IV, and seven patients had postoperative recurrence. Regarding EGFR gene mutations, 25 (83.3%) patients had a 19del mutation, and five (16.6%) had an L858R mutation. At the time of enrollment, EGFR mutations in the blood were detected in 19 patients (63.3%).
Clinical course of enrolled patients
Three of the 30 patients were still on afatinib therapy during the final analysis. The most frequent reason for treatment termination was disease progression (18 patients), followed by AEs (six patients) and patient choice (two patients) (Fig. 1). The overall response rate (ORR) was assessed in patients who received at least one treatment and for whom a response assessment was conducted. PFS and OS were analyzed in the ITT population.
Results and comparison of EGFR testing between tumor and blood biopsy
At diagnosis, all 30 patients were examined using liquid biopsy. Blood samples from 19 patients had the same EGFR mutation as those in the tumor samples (63.3%, Supplementary Table 3). Four of 18 patients who reached PD were positive for the EGFR T790M mutation using liquid biopsy (22.2%, Table 2). Three out of 10 patients examined with tumor and liquid biopsies were positive and negative for T790M, respectively (30.0%, Table 2). In contrast, four patients who were positive for T790M by liquid biopsy were not eligible for tumor biopsy. Among the 10 patients who underwent both tumor and liquid biopsy at PD, the same EGFR mutations were detected in four patients by both methods (40.0%, Table 2). The results of EGFR mutation by tumor tissue re-biopsy were the same as those of liquid biopsy in the three patients who were positive for major EGFR mutations and negative for the T790M mutation by liquid biopsy at PD (100%) (Supplementary Table 4). Two patients out of 18 were positive for the 19del mutation (11.1%, Supplementary Table 5) at the intermediate and pre-treatment stage using liquid biopsy. All patients were negative for the T790M mutation at the intermediate stage.
Factors related to the detection of EGFR mutation by liquid biopsy
To identify the factors related to the detection of EGFR mutations in blood samples, clinical variables were compared between the positive and negative results in EGFR testing by liquid biopsy (Table 3). There were significant differences in alkaline phosphatase (ALP) and extra-thoracic, brain, and adrenal metastases between the positive and negative results in EGFR testing from blood samples (ALP: 304 U/L vs. 225 U/L, P = 0.0048; extrathoracic metastasis: 89.4% vs. 27.2%, P = 0.0010; brain metastases: 36.8% vs. 0%, P = 0.0292; adrenal metastases: 36.8% vs. 0%, P = 0.0292, log-rank).
Treatment efficacy and toxicity of afatinib
PFS and OS were analyzed in the ITT population. Median OS and PFS were 34.0 months (95% confidence interval [CI], 28.8 months–not reached) and 19.4 months (95% CI, 8.57–26.8 months), respectively (Fig. 2a, b). The median observation time was 34.0 months. Seventeen (56.6%) patients died, and 18 (60.0%) reached PD after afatinib treatment. The ORR was 53.3%. The AEs associated with afatinib are presented in Supplementary Tables 6 and 7. The AEs observed in this study were similar to those reported previously. Grade 3 AEs occurred in 10 patients (33.3%). No grade 4 or treatment-related deaths were observed. Afatinib was terminated in six patients (20%) due to AEs.
Liquid biopsy as a potential prognostic biomarker
OS and PFS were compared among patients based on the results of EGFR testing using liquid biopsy at the pre-treatment stage (Figs. 3a and b). OS among patients positive for EGFR mutation from liquid biopsy at pre-treatment was significantly shorter than that of negative patients (32 months vs. not reached, hazard ratio [HR], 4.66; 95% CI 1.50–20.4; P = 0.009). PFS among positive patients was also significantly shorter than that of negative patients (11.3 months vs not reached, HR, 3.78; 95% CI 1.30–13.6; P = 0.015).
OS and PFS were compared in patients with and without the T790M mutation at PD (Fig. 4a, b). There were no significant differences between the two groups. However, the ORR of T790M positive patients was higher than that of negative patients without a significant difference (85.7% positive, 54.5% negative, P = 0.315, Supplementary Table 4).
Eleven patients received osimertinib as post-treatment for afatinib, which was discontinued due to its AEs. Four underwent liquid biopsy at PD, three had tissue re-biopsy at PD, and were confirmed T790M-positive, indicating a switch to osimertinib. One patient was negative for T790M at PD but continued on afatinib after PD, then switched to osimertinib because another liquid biopsy was positive for T790M. Two patients discontinued afatinib and switched to osimertinib because of AEs. One patient changed from afatinib to gefitinib because of AEs, and then to osimertinib because both tissue re-biopsy and liquid biopsy were positive for the T790M mutation.
This prospective, multicenter, observational trial was conducted to elucidate the efficacy of liquid biopsy in detecting EGFR mutations in patients with NSCLC on afatinib therapy in Japan. At diagnosis, liquid biopsy could detect 19 cases (63.3%) among patients with EGFR mutations, as proven by tumor biopsy (Supplementary Table 3). EGFR T790M mutations were detected in four (22.2%) patients who reached PD and were examined by liquid biopsy (Table 2). The OS and PFS of patients with detectable EGFR mutations by liquid biopsy were significantly shorter than those with undetectable EGFR mutations (Fig. 3a, b).
Molecular diagnosis is necessary for the clinical management of patients with NSCLC because molecular targeting agents are more efficient in cases harboring driver oncogene mutations. Traditionally, gene mutations have been tested in tumor tissue samples. Liquid biopsy, which involves gene testing using blood samples, is becoming more popular because it is less invasive and useful in cases of insufficient tumor tissue. The Food and Drug Administration has already approved polymerase chain reaction (PCR)- and next-generation gene-sequencing (NGS)-based methods for liquid biopsy to detect driver oncogene mutations .
Some guidelines from the National Comprehensive Cancer Network and the European Society for Medical Oncology also recommend liquid biopsy for the detection of EGFR mutations [15, 16]. In contrast, the Japanese Lung Cancer Society states that plasma testing should only be performed when it is difficult to perform EGFR gene testing on lung cancer tissue specimens for medical reasons .
The sensitivity of liquid biopsy using the Cobas ® EGFR Mutation Test v2 has been reported to be 37.9–74.0% [18,19,20]. Liquid biopsy sensitivity at diagnosis in our study was within this range (63.3%, Supplementary Table 3). As shown in Table 3, liquid biopsy sensitivity for detecting EGFR mutations was higher in cases with distant metastases. In a phase III trial of afatinib (LUX-lung 3 and 6), EGFR mutation detection using liquid biopsy was significantly related to the number of metastases . Therefore, with proper patient selection, liquid biopsy sensitivity can be improved because metastasis seems to reflect the amount of DNA shed into the bloodstream. Additionally, more sensitive detection methods, such as droplet digital PCR (ddPCR) and NGS, may increase the sensitivity of liquid biopsies. The reported sensitivity of ddPCR was 93.5–100% [22, 23].
The detection of the T790M resistant gene mutation is important for patients treated with first- or second-generation EGFR-TKIs. In our study, T790M was detected by liquid biopsy in four of the 18 patients who reached PD (22.2%, Table 2). Others have reported various sensitivities of T790M detection in a blood sample using a Cobas ® detection kit. Koyama, et al. reported that the success rate of liquid biopsy was 43.8% . In the JP-CLEAR trial, the sensitivity of plasma T790M using the cobas® EGFR Mutation Test was 21.1% . Based on the data from tissue biopsy, we previously reported that the incidence of T790M at PD among patients treated with afatinib was 40.2%, which was lower than those of first-generation EGFR-TKIs (52.5%) .
Liquid biopsy can provide the opportunity to search for driver oncogene mutations, even in patients with insufficient tumor samples; hence, the combination of liquid biopsy with tumor biopsy increases the detection rate of the T790M resistance gene.
Liquid biopsy also provides an opportunity to track disease progression throughout treatment or predict recurrence following adjuvant therapy [26,27,28,29]. We identified a significant relationship between positive EGFR mutation in liquid biopsy and the existence of metastasis (Table 3); hence, positivity in liquid biopsy has been linked to more advanced diseases, including metastasis and poorer performance status [17, 30]. Therefore, it is understandable that positive EGFR mutation by liquid biopsy at diagnosis was identified as a poor prognostic factor, as shown in Figs. 3a and b.
We performed intermediate liquid biopsy 10 and 8 months after the initiation of afatinib in cases of Ex19del and L858R mutations, respectively. In this setting, only two patients were positive for the original EGFR mutation. Other groups reported that molecular progression, indicated by detectable EGFR in plasma, was detected 1.5–2.2 months before clinical progression [16, 31]. Our intermediate liquid biopsy might be too early to detect molecular progression because PFS after afatinib in this study was 19.4 months (Fig. 2b). The clearance of cfDNA and circulating tumor DNA (ctDNA) are promising to evaluate the treatment efficacy of anti-cancer therapy among patients with NSCLC. According to Song et al., patients having driver mutation clearance and ctDNA clearance at any course of chemotherapy were related to higher PFS and OS . However, in our study, there were no statistically significant differences in OS (HR, 1.50; 95% CI 0.43–5.22 P = 0.517) and PFS (HR, 0.69; 95% CI 0.22–2.15; P = 0.521) between patients with and without clearance of EGFR mutation. This may be due to our study’s limited number of cases. CtDNA kinetics have also been reported effective for the early detection of molecular PD. Shenglin et al. revealed that molecular PD, indicated by the emergence of new mutations or an increase in pre-existing mutations, was identified with a mean lead time of 2.5 months before radiological PD in their longitudinal ctCNA trial .
This study had several limitations. First, the sample size was small. Second, the sensitivity of the Cobas ® EGFR Mutation Test v2 kit might be insufficient. For the minimum detection sensitivity of the plasma test using this method, the detection limit of the mutant DNA was 100 copies/ml in 100,000 copies/mL of wild-type DNA. Conversely, ddPCR, used in Maximilian J Hochmair's study, identified T790M in less than 10 copies/ml with a minimum detection sensitivity of 0.01%. A higher T790M positivity rate (73%) after afatinib was reported using ddPCR in their study . Every patient was not examined by both tumor and liquid biopsy at PD because some patients had no suitable lesion for tumor tissue biopsy following treatment with afatinib. Future studies should include a large number of patients, require the collection of both tissue and plasma samples, and use highly sensitive and quantitative methods such as ddPCR and NGS.
A liquid biopsy at diagnosis can be a prognostic factor for EGFR-TKI treatment. Tumor re-biopsy can be omitted in patients with positive EGFR mutations by liquid biopsy during PD.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
Cell-free deoxyribonucleic acid
Droplet digital polymerase chain reaction
Epidermal growth factor receptor
- ECOG PS:
Eastern Cooperative Oncology Group performance status
Non-small cell lung cancer
Overall response rate
- PaO2 :
Partial pressure of oxygen
Tyrosine kinase inhibitors
Papadimitrakopoulou VA, Mok TS, Han JY, Ahn MJ, Delmonte A, Ramalingam SS, et al. Osimertinib versus platinum-pemetrexed for patients with EGFR T790M advanced NSCLC and progression on a prior EGFR-tyrosine kinase inhibitor: AURA3 overall survival analysis. Ann Oncol. 2020;31:1536–44.
Mitsudomi T, Morita S, Yatabe Y, Negoro S, Okamoto I, Tsurutani J, et al. Gefitinib versus cisplatin plus docetaxel in patients with non-small-cell lung cancer harbouring mutations of the epidermal growth factor receptor (WJTOG3405): an open label, randomised phase 3 trial. Lancet Oncol. 2010;11:121–8.
Sequist LV, Yang JC, Yamamoto N, O’Byrne K, Hirsh V, Mok T, et al. Phase III study of afatinib or cisplatin plus pemetrexed in patients with metastatic lung adenocarcinoma with EGFR mutations. J Clin Oncol. 2013;31:3327–34.
Yang JC, Wu YL, Schuler M, Sebastian M, Popat S, Yamamoto N, et al. Afatinib versus cisplatin-based chemotherapy for EGFR mutation-positive lung adenocarcinoma (LUX-Lung 3 and LUX-Lung 6): analysis of overall survival data from two randomised, phase 3 trials. Lancet Oncol. 2015;16:141–51.
Wu YL, Zhou C, Hu CP, Feng J, Lu S, Huang Y, et al. Afatinib versus cisplatin plus gemcitabine for first-line treatment of Asian patients with advanced non-small-cell lung cancer harbouring EGFR mutations (LUX-Lung 6): an open-label, randomised phase 3 trial. Lancet Oncol. 2014;15:213–22.
Kato T, Yoshioka H, Okamoto I, Yokoyama A, Hida T, Seto T, et al. Afatinib versus cisplatin plus pemetrexed in Japanese patients with advanced non-small cell lung cancer harboring activating EGFR mutations: subgroup analysis of LUX-Lung 3. Cancer Sci. 2015;106:1202–11.
Park K, Tan EH, O’Byrne K, Zhang L, Boyer M, Mok T, et al. Afatinib versus gefitinib as first-line treatment of patients with EGFR mutation-positive non-small-cell lung cancer (LUX-Lung 7): a phase 2B, open-label, randomised controlled trial. Lancet Oncol. 2016;17:577–89.
Kobayashi N, Katakura S, Kamimaki C, Somekawa K, Fukuda N, Tanaka K, et al. Resistance mechanisms of epidermal growth factor receptor tyrosine kinase inhibitors in non-small cell lung cancer patients: a meta-analysis. Thorac Cancer. 2021;12:1096–105.
Couraud S, Vaca-Paniagua F, Villar S, Oliver J, Schuster T, Blanché H, et al. Noninvasive diagnosis of actionable mutations by deep sequencing of circulating free DNA in lung cancer from never-smokers: a proof-of-concept study from BioCAST/IFCT-1002. Clin Cancer Res. 2014;20:4613–24.
Lin N, Lin Y, Xu J, Liu D, et al. A multi-analyte cell-free DNA–based blood test for early detection of hepatocellular carcinoma. Hepatol Commun. 2022;00:1–11.
Roy D, Tiirikainen M. Diagnostic power of DNA methylation classifiers for early detection of cancer. Trends Cancer. 2020;6:78–81.
Douillard JY, Ostoros G, Cobo M, Ciuleanu T, Cole R, McWalter G, et al. Gefitinib treatment in EGFR mutated caucasian NSCLC: circulating-free tumor DNA as a surrogate for determination of EGFR status. J Thorac Oncol. 2014;9:1345–53.
Roy D, Lucci A, Ignatiadis M, Jeffrey SS. Cell-free circulating tumor DNA profiling in cancer management. Trends Mol Med. 2021;S1471–4914(21):00182–9.
Odogwu L, Mathieu L, Goldberg KB, Blumenthal GM, Larkins E, Fiero MH, et al. FDA benefit-risk assessment of Osimertinib for the treatment of metastatic non-small cell lung cancer harboring epidermal growth factor receptor T790M mutation. Oncologist. 2018;23:353–9.
National Comprehensive Cancer Network. NCCN clinical practice guidelines in oncology (NCCN Guidelines): Non-Small Cell Lung Cancer. (Version 3.2020). 2020. [cited Aug 17, 2022] Available from: https://www2.tri-kobe.org/nccn/guideline/lung/english/non_small.pdf.
Novello S, Barlesi F, Califano R, Cufer T, Ekman S, Levra MG, et al. Metastatic non-small-cell lung cancer: ESMO clinical practice guidelines for diagnosis, treatment and follow-up. Ann Oncol. 2016;27(Suppl 5):v1–27.
The Japan Lung Cancer Society. Guidance for EGFR Gene Mutation Testing in Lung Cancer Patients. (version 5.0). 2021. [citer Aug 17, 2022] Available from: https://www.haigan.gr.jp/uploads/files/%E8%82%BA%E7%99%8C%E6%82%A3%E8%80%85%E3%81%AB%E3%81%8A%E3%81%91%E3%82%8BEGFR%E9%81%BA%E4%BC%9D%E5%AD%90%E5%A4%89%E7%95%B0%E6%A4%9C%E6%9F%BB%E3%81%AE%E6%89%8B%E5%BC%95%E3%81%8Dv5.0_%E6%9C%80%E7%B5%82%E7%89%88_20211219.pdf.
Shin KH, Lee SM, Park K, Choi H, Kim IS, Yoon SH, et al. Effects of different centrifugation protocols on the detection of EGFR mutations in plasma cell-free DNA. Am J Clin Pathol. 2022;158:206–11.
Mok T, Wu YL, Lee JS, Yu CJ, Sriuranpong V, Sandoval-Tan J, et al. Detection and dynamic changes of EGFR mutations from circulating tumor DNA as a predictor of survival outcomes in NSCLC patients treated with first-line intercalated erlotinib and chemotherapy. Clin Cancer Res. 2015;21:3196–203.
Ho HL, Jiang Y, Chiang CL, Karwowska S, Yerram R, Sharma K, et al. Efficacy of liquid biopsy for disease monitoring and early prediction of tumor progression in EGFR mutation-positive non-small cell lung cancer. PLoS ONE. 2022;17: e0267362.
Wu YL, Sequist LV, Hu CP, Feng J, Lu S, Huang Y, et al. EGFR mutation detection in circulating cell-free DNA of lung adenocarcinoma patients: analysis of LUX-Lung 3 and 6. Br J Cancer. 2017;116:175–85.
He J, Tan W, Tang X, Ma J. Variations in EGFR ctDNA correlates to the clinical efficacy of afatinib in non small cell lung cancer with acquired resistance. Pathol Oncol Res. 2017;23:307–15.
Sacher AG, Paweletz C, Dahlberg SE, Alden RS, O’Connell A, Feeney N, et al. Prospective validation of rapid plasma genotyping for the detection of EGFR and KRAS mutations in advanced lung cancer. JAMA Oncol. 2016;2:1014–22.
Koyama K, Miura S, Watanabe S, Shoji S, Koshio J, Hayashi Y, et al. Observational study of rebiopsy in EGFR-TKI-resistant patients with EGFR mutation-positive advanced NSCLC. Sci Rep. 2022;12:6367.
Naka G, Yokoyama T, Usui K, Ishida H, Kishi K, Uemura K, et al. Final report on plasma ctDNA T790M monitoring during EGFR-TKI treatment in patients with EGFR mutant non-small cell lung cancer (JP-CLEAR trial). Jpn J Clin Oncol. 2022;52:783–6.
Corcoran RB, Chabner BA. Application of cell-free DNA analysis to cancer treatment. N Engl J Med. 2018;379:1754–65.
Jamal-Hanjani M, Wilson GA, McGranahan N, Birkbak NJ, Watkins TBK, Veeriah S, et al. Tracking the evolution of non-small-cell lung cancer. N Engl J Med. 2017;376:2109–21.
Zugazagoitia J, Ramos I, Trigo JM, Palka M, Gómez-Rueda A, Jantus-Lewintre E, et al. Clinical utility of plasma-based digital next-generation sequencing in patients with advance-stage lung adenocarcinomas with insufficient tumor samples for tissue genotyping. Ann Oncol. 2019;30:290–6.
Abbosh C, Birkbak NJ, Wilson GA, Jamal-Hanjani M, Constantin T, Salari R, et al. Phylogenetic ctDNA analysis depicts early-stage lung cancer evolution. Nature. 2017;545:446–51.
Kuo CY, Lee MH, Tsai MJ, Yang CJ, Hung JY, Chong IW. The factors predicting concordant epidermal growth factor receptor (EGFR) mutation detected in liquid/tissue biopsy and the related clinical outcomes in patients of advanced lung adenocarcinoma with EGFR mutations. J Clin Med. 2019;8:1758.
Zheng D, Ye X, Zhang MZ, Sun Y, Wang JY, Ni J, et al. Plasma EGFR T790M ctDNA status is associated with clinical outcome in advanced NSCLC patients with acquired EGFR-TKI resistance. Sci Rep. 2016;6:20913.
Song Y, Hu C, Xie Z, Wu L, Zhu Z, Rao C, et al. Circulating tumor DNA clearance predicts prognosis across treatment regimen in a large real-world longitudinally monitored advanced non-small cell lung cancer cohort. Transl Lung Cancer Res. 2020;9:269–79.
Ma S, Shi M, Chen X, Wang Y, Yang Z, Lizaso A, et al. The prognostic value of longitudinal circulating tumor DNA profiling during osimertinib treatment. Transl Lung Res. 2021;10:326–39.
Hochmair MJ, Buder A, Schwab S, Burghuber OC, Prosch H, Hilbe W, et al. Liquid-biopsy-based identification of EGFR T790M mutation-mediated resistance to afatinib treatment in patients with advanced EGFR mutation-positive NSCLC, and subsequent response to Osimertinib. Target Oncol. 2019;14:75–83.
We would like to thank Editage (www.editage.com) for English language editing.
This work was supported by Boehringer Ingelheim.
Ethics approval and consent to participate
This study followed the guidelines of the Declaration of Helsinki and was approved by the institutional review board at Yokohama City University Hospital (approval number B160804003). All the patients provided written informed consent before enrollment.
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The authors declare that they have no competing interests.
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Inclusion criteria. Supplementary Table 2. Exclusion criteria. Supplementary Table 3. EGFR mutations found in pre-treatment biopsies. Supplementary Table 4. Results of †EGFR testing among 18 patients who reached ‡PD. Supplementary Table 5. †EGFR mutation found by liquid biopsy at intermediate. Supplementary Table 6. Safety summary in patients treated with afatinib. Supplementary Table 7. All-cause adverse events.
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Fujii, H., Nagakura, H., Kobayashi, N. et al. Liquid biopsy for detecting epidermal growth factor receptor mutation among patients with non-small cell lung cancer treated with afatinib: a multicenter prospective study. BMC Cancer 22, 1035 (2022). https://doi.org/10.1186/s12885-022-10135-z
- Cell-free deoxyribonucleic acid
- Epidermal growth factor receptor
- Liquid biopsy
- Non-small cell lung cancer
- Second-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors