Abstract
Purpose
We aimed to develop a highly sensitive method to detect ESR1 mutations in cell-free DNA (cfDNA) using next-generation sequencing with molecular barcode (MB–NGS) targeting the hotspot segment (c.1600–1713).
Methods
The sensitivity of MB–NGS was tested using serially diluted ESR1 mutant DNA and then cfDNA samples from 34 patients with metastatic breast cancer were analyzed with MB–NGS. The results of MB–NGS were validated in comparison with conventional NGS and droplet digital PCR (ddPCR).
Results
MB–NGS showed a higher sensitivity (0.1%) than NGS without barcode (1%) by reducing background errors. Of the cfDNA samples from 34 patients with metastatic breast cancer, NGS without barcode revealed seven mutations in six patients (17.6%) and MB–NGS revealed six additional mutations including three mutations not reported in the COSMIC database of breast cancer, resulting in total 13 ESR1 mutations in ten patients (29.4%). Regarding the three hotspot mutations, all the patients with mutations detected by MB–NGS had identical mutations detected by droplet digital PCR (ddPCR), and mutant allele frequency correlated very well between both (r = 0.850, p < 0.01). Moreover, all the patients without these mutations by MB–NGS were found to have no mutations by ddPCR.
Conclusion
In conclusion, MB–NGS could successfully detect ESR1 mutations in cfDNA with a higher sensitivity of 0.1% than conventional NGS and was considered as clinically useful as ddPCR.
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Acknowledgements
The authors would like to thank Katsuhide Yoshidome (Osaka Police Hospital, Osaka, Japan) for kindly providing the plasma samples of healthy volunteers examined in this manuscript.
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Conflict of Interest
This study was supported in part by the research funding from Novartis, Pfizer, and Sysmex. Shinzaburo Noguchi has received research grant for other study from AstraZeneca and honoraria from AstraZeneca, Novartis, Pfizer, and Sysmex, and has been an advisor for AstraZeneca and Novartis. Naofumi Kagara received honoraria from AstraZeneca and Novartis. Yasuto Naoi received honoraria from AstraZeneca and Sysmex and research grant from AstraZeneca for other study. Masafumi Shimoda received honoraria from Novartis. Kenzo Shimazu received honoraria from AstraZeneca. Seung Jin Kim received honoraria from AstraZeneca, Novartis, and Pfizer. The other authors declare that they do not have a financial relationship with the organizations that sponsored the research.
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This study complied with the current laws of Japan. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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10549_2017_4487_MOESM2_ESM.pptx
Supplementary Fig. 1 The clinical course of the patients with ESR1 mutations. The clinical course and the treatments are shown in the panel for the ten patients with ESR1 mutations. Treatments with aromatase inhibitors are highlighted in orange. LN, lymph node; met, metastasis; Ax, axillary; Sc; supraclavicular; abd. Abdominal; FEC, fluorouracil, epirubicin and cyclophosphamide; PTX, paclitaxel; LET, letrozole; TAM, tamoxifen; RT, radiation therapy; TOR, toremifene; ANA, anastrozole; EXE, exemestane; Bev, bevacizumab; ERI, eribulin; MPA, medroxyprogesterone acetate; DOC, docetaxel; GnRHa, gonadotropin releasing hormone analog; Zola (Zoladex), goserelin acetate; GEM, gemcitabine; VNR, vinorelbine; CPT-11, camptothecin 11; NK105, paclitaxel-incorporating micellar nanoparticle formulation; FUL, fulvestrant; Leu (Leuplin), leuprorelin; CMF, cyclophosphamide, methotrexate and fluorouracil; CE, cyclophosphamide and epirubicin; Lap, lapatinib; CAP, capecitabine; EVE, everolimus; XC, capecitabine and cyclophosphamide; FUR, doxifluridine; Tzb, trastuzumab; DOC + T+P, docetaxel, trastuzumab and pertuzumab (PPTX 50 Skb)
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Masunaga, N., Kagara, N., Motooka, D. et al. Highly sensitive detection of ESR1 mutations in cell-free DNA from patients with metastatic breast cancer using molecular barcode sequencing. Breast Cancer Res Treat 167, 49–58 (2018). https://doi.org/10.1007/s10549-017-4487-y
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DOI: https://doi.org/10.1007/s10549-017-4487-y