Radiotherapy increases plasma levels of tumoral cell-free DNA in non-small cell lung cancer patients
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Shun-ichiro Kageyama1, Keiji Nihei1, Katsuyuki Karasawa1, Takeshi Sawada1, Fumiaki Koizumi1, Shigeo Yamaguchi1, Shunsuke Kato1, Hidehiro Hojo1, Atsuhi Motegi1, Katsuya Tsuchihara1 and Tetsuo Akimoto1
1National Cancer Center Hospital East, Kashiwa, Chiba 277-8577, Japan
Shun-ichiro Kageyama, email: firstname.lastname@example.org
Keywords: tumoral cell-free DNA; radiotherapy; NSCLC; tumor-specific mutations; digital PCR
Received: November 21, 2017 Accepted: March 21, 2018 Published: April 10, 2018
We investigated the plasma levels of tumor-specific cell-free DNA (cfDNA) in 17 stage I–II (early) and IV (advanced) non-small cell lung cancer (NSCLC) patients who underwent radiotherapy. Digital polymerase chain reaction (PCR) and targeted sequencing showed that total and tumor-specific cfDNA levels increased in response to radiotherapy in both early- and advanced-stage NSCLC patients. We detected high copy numbers of epidermal growth factor receptor mutations (L858R and T790M) in the cfDNA samples from stage IV NSCLC patients who underwent stereotactic body radiation therapy to treat brain metastasis related to tyrosine kinase inhibitor (TKI) treatment failure. In conclusion, our study demonstrates that radiotherapy increases tumoral cfDNA levels in the plasma and shows potential to serve as an indicator for diagnosing drug-resistant tumor-related gene mutations in early-stage NSCLC patients or those undergoing molecular targeted therapy.
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