Breast Cancer

, Volume 22, Issue 5, pp 462–468 | Cite as

Prevalence and differentiation of hereditary breast and ovarian cancers in Japan

  • Seigo Nakamura
  • Masato Takahashi
  • Mitsuhiro Tozaki
  • Takahiro Nakayama
  • Tadashi Nomizu
  • Yoshio Miki
  • Yoshie Murakami
  • Daisuke Aoki
  • Takuji Iwase
  • Seiichiro Nishimura
  • Hideko Yamauchi
  • Shozo Ohsumi
  • Shinichi Baba
  • Tadao Shimizu
Original Article

Abstract

Background

We assembled needed data on the prevalence and characteristics of BRCA1/2 in Japan.

Materials and methods

Our study of BRCA1/2 collected data at eight institutions in Japan on 320 individuals with a strong family history of breast cancer, according to the NCCN guidelines, by the end of March 2012.

Results

Among 260 proband cases, 46 (17.7 %) were positive for BRCA1, and 35 (13.5 %) were BRCA2-positive. Therefore, the total pathological mutation rate was 30.7 %. Pathology data after breast surgery were obtained from 37 cases of BRCA1 mutation, 23 (62.2 %) of which were triple negative (TN). On the other hand, 29 cases (82.9 %) of BRCA2 mutations were Luminal type. The most prevalent BRCA1 mutation site was L63X, found in 10 families. L63X was reported previously by studies in Japan, and it may be a founder mutation. We found two cases of large deletion detected by multiplex ligation-dependent probe amplification. One was an entire deletion of exon 20 and the lacked exons 1–9. TN with a family history of ovarian cancer was 11/20 (55 %). TN under 40-year-old (y.o.) 15/23 (65.2 %) and TN with one or more breast cancers in family history 17/32 (53.1 %) showed higher incidences of BRCA1 mutation.

Conclusion

Hereditary breast and ovarian cancer (HBOC) may have nearly the same prevalence in Japan as in the US or Europe. If TN cases are taken into account, the ratio of BRCA1 is higher. L63X may be one of the founder mutations in Japan. A nationwide database of HBOC is important to develop risk models for BRCA1/2 carriers in Japan.

Keywords

HBOC BRCA1 BRCA2 Triple negative L63X 

Notes

Conflict of interest

Seigo Nakamura has no conflict of interest. Masato Takahashi has no conflict of interest. Mitsuhiro Tozaki has no conflict of interest. Takahiro Nakayama has no conflict of interest. Tadashi Nomizu has no conflict of interest. Yoshio Miki received $30,000/year as a royalty for Breast Cancer Gene U-2090 from the University of Utah. Yoshie Murakami has no conflict of interest. Daisuke Aoki has no conflict of interest. Takuji Iwase has no conflict of interest. Seiichiro Nishimura has no conflict of interest. Hideko Yamauchi has no conflict of interest. Shozo Ohsumi has no conflict of interest. Shinichi Baba has no conflict of interest. Tadao Shimizu has no conflict of interest.

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Copyright information

© The Japanese Breast Cancer Society 2013

Authors and Affiliations

  • Seigo Nakamura
    • 1
  • Masato Takahashi
    • 2
  • Mitsuhiro Tozaki
    • 3
  • Takahiro Nakayama
    • 4
  • Tadashi Nomizu
    • 5
  • Yoshio Miki
    • 6
  • Yoshie Murakami
    • 7
  • Daisuke Aoki
    • 8
  • Takuji Iwase
    • 9
  • Seiichiro Nishimura
    • 10
  • Hideko Yamauchi
    • 11
  • Shozo Ohsumi
    • 12
  • Shinichi Baba
    • 13
  • Tadao Shimizu
    • 14
  1. 1.Division of Breast Surgical Oncology, Department of SurgeryShowa University School of MedicineTokyoJapan
  2. 2.Department of Breast SurgeryHokkaido Cancer CenterSapporoJapan
  3. 3.Breast CenterKameda Medical CenterChibaJapan
  4. 4.Department of Breast and Endocrine SurgeryOsaka Medical Center for Cancer and Cardiovascular DiseaseOsakaJapan
  5. 5.Department of SurgeryHoshi General HospitalFukushimaJapan
  6. 6.Department of Genetic DiagnosisThe Cancer Institute Hospital of JFCRTokyoJapan
  7. 7.Department of Adult Health NursingToho UniversityTokyoJapan
  8. 8.Department of Obstetrics and GynecologyKeio University School of MedicineTokyoJapan
  9. 9.Breast Oncology CenterThe Cancer Institute Hospital of Japanese Foundation of Cancer ResearchTokyoJapan
  10. 10.Department of Breast SurgeryShizuoka Cancer CenterShizuokaJapan
  11. 11.Breast Surgical DepartmentSt.Luke’s International HospitalTokyoJapan
  12. 12.Breast OncologyShikoku Cancer CenterEhimeJapan
  13. 13.Breast Surgery DepartmentSagara HospitalKagoshimaJapan
  14. 14.Department of Breast SurgeryTokyo Women’s Medical University Medical Center EastTokyoJapan

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