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Related Experiment Video

Updated: May 30, 2025

gDNA Enrichment by a Transposase-based Technology for NGS Analysis of the Whole Sequence of BRCA1, BRCA2, and 9 Genes Involved in DNA Damage Repair
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Genetic Predisposition to Male Breast Cancer.

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|January 31, 2025
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Summary

Genetic testing in male breast cancer (mBC) patients revealed that pathogenic variants (PVs) in BRCA2, BRCA1, and PALB2 significantly increase mBC risk. This supports universal genetic screening for early detection and personalized treatment.

Keywords:
NGSgermline genetic testinghereditary cancer predispositionmale breast cancer

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Area of Science:

  • Oncology
  • Genetics
  • Cancer Predisposition

Background:

  • Male breast cancer (mBC) is rare, accounting for <1% of all breast cancers globally.
  • Genetic factors, specifically germline pathogenic variants (PVs) in cancer predisposition genes, are crucial in mBC risk.
  • Approximately 15% of mBC cases are linked to germline PVs.

Purpose of the Study:

  • To investigate the prevalence and impact of germline pathogenic variants (PVs) in male breast cancer (mBC) patients.
  • To identify specific genes associated with increased mBC risk in a Czech cohort.
  • To evaluate the clinical characteristics of mBC patients with PVs.

Main Methods:

  • Germline genetic testing using the CZECANCA panel (226 genes) via next-generation sequencing.
  • Analysis of 248 Czech mBC patients and 3,626 male controls.
  • Statistical analysis to determine the association between PVs and mBC risk (Odds Ratio).

Main Results:

  • 18.5% of mBC patients carried PVs in established predisposition genes, primarily BRCA2 (34/46), BRCA1 (7/46), and PALB2 (5/46).
  • PVs in BRCA2, BRCA1, and PALB2 significantly elevated mBC risk (ORs 44.04, 5.82, 8.26, respectively).
  • PVs in CHEK2 were also significantly associated with increased mBC risk (OR = 4.98); carriers were younger and had more aggressive tumors.

Conclusions:

  • BRCA2 is a critical gene for male breast cancer (mBC) predisposition.
  • Additional genes like CHEK2 may contribute to mBC risk, warranting further investigation.
  • Universal genetic testing for all mBC patients is justified for improved early detection and tailored therapies.