Prevalence of disease-causing genes in Japanese patients with BRCA1/2-wildtype hereditary breast and ovarian cancer syndrome

Tomoko Kaneyasu, Seiichi Mori, Hideko Yamauchi, Shozo Ohsumi, Shinji Ohno, Daisuke Aoki, Shinichi Baba, Junko Kawano, Yoshio Miki, Naomichi Matsumoto, Masao Nagasaki, Reiko Yoshida, Sadako Akashi-Tanaka, Takuji Iwase, Dai Kitagawa, Kenta Masuda, Akira Hirasawa, Masami Arai, Junko Takei, Yoshimi IdeOsamu Gotoh, Noriko Yaguchi, Mitsuyo Nishi, Keika Kaneko, Yumi Matsuyama, Megumi Okawa, Misato Suzuki, Aya Nezu, Shiro Yokoyama, Sayuri Amino, Mayuko Inuzuka, Tetsuo Noda, Seigo Nakamura

Research output: Contribution to journalArticle

Abstract

Panel sequencing of susceptibility genes for hereditary breast and ovarian cancer (HBOC) syndrome has uncovered numerous germline variants; however, their pathogenic relevance and ethnic diversity remain unclear. Here, we examined the prevalence of germline variants among 568 Japanese patients with BRCA1/2-wildtype HBOC syndrome and a strong family history. Pathogenic or likely pathogenic variants were identified on 12 causal genes for 37 cases (6.5%), with recurrence for 4 SNVs/indels and 1 CNV. Comparisons with non-cancer east-Asian populations and European familial breast cancer cohorts revealed significant enrichment of PALB2, BARD1, and BLM mutations. Younger onset was associated with but not predictive of these mutations. Significant somatic loss-of-function alterations were confirmed on the wildtype alleles of genes with germline mutations, including PALB2 additional somatic truncations. This study highlights Japanese-associated germline mutations among patients with BRCA1/2 wildtype HBOC syndrome and a strong family history, and provides evidence for the medical care of this high-risk population.

Original languageEnglish
Article number25
Journalnpj Breast Cancer
Volume6
Issue number1
DOIs
Publication statusPublished - 2020 Dec 1

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Pharmacology (medical)

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    Kaneyasu, T., Mori, S., Yamauchi, H., Ohsumi, S., Ohno, S., Aoki, D., Baba, S., Kawano, J., Miki, Y., Matsumoto, N., Nagasaki, M., Yoshida, R., Akashi-Tanaka, S., Iwase, T., Kitagawa, D., Masuda, K., Hirasawa, A., Arai, M., Takei, J., ... Nakamura, S. (2020). Prevalence of disease-causing genes in Japanese patients with BRCA1/2-wildtype hereditary breast and ovarian cancer syndrome. npj Breast Cancer, 6(1), [25]. https://doi.org/10.1038/s41523-020-0163-1