A multicentre, prospective study of plasma circulating tumour DNA test for detecting RAS mutation in patients with metastatic colorectal cancer

Hideaki Bando, Yoshinori Kagawa, Takeshi Kato, Kiwamu Akagi, Tadamichi Denda, Tomohiro Nishina, Yoshito Komatsu, Eiji Oki, Toshihiro Kudo, Hiroshi Kumamoto, Takeharu Yamanaka, Takayuki Yoshino

Research output: Contribution to journalArticle

3 Citations (Scopus)


Background: OncoBEAMTM RAS CRC kit using BEAMing technology is a circulating tumour DNA (ctDNA) test for detecting plasma RAS mutational status in metastatic colorectal cancer (mCRC). We conducted a multicentre, prospective study to investigate the concordance of the RAS mutational status between plasma ctDNA and tumour tissue DNA. Methods: mCRC patients without prior anti-EGFR antibodies or regorafenib treatment were enroled. Plasma- and tissue-based RAS mutational status were determined by BEAMing, respectively. Results: A total of 280 patients from eight institutions were eligible. The overall agreement between plasma- and tissue-based analyses was 86.4%, with a positive percent agreement of 82.1% and negative percent agreement of 90.4%. From logistic regression analysis, lung metastasis alone indicated the most significant factor associated with discordance. The agreement between plasma- and tissue-based analyses was 64.5% in patients with lung metastasis alone (n = 31) indicating lower amount of ctDNA. Among the cases with lung metastasis alone, all plasma- and tissue-based analyses were perfectly concordant in cases with ≥20 mm of maximum lesion diameter or ≥10 lesions. Conclusion: The clinical validity of OncoBEAMTM RAS CRC kit was confirmed. Careful attention should be paid for mCRC patients with lung metastases alone having fewer metastases or smaller diameter lesions.

Original languageEnglish
Pages (from-to)982-986
Number of pages5
JournalBritish journal of cancer
Issue number10
Publication statusPublished - May 14 2019


All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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