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01.12.2014 | Research | Ausgabe 1/2014 Open Access

Hereditary Cancer in Clinical Practice 1/2014

TP53 p.R337H prevalence in a series of Brazilian hereditary breast cancer families

Zeitschrift:
Hereditary Cancer in Clinical Practice > Ausgabe 1/2014
Autoren:
Nathalia M Cury, Victor EF Ferraz, Wilson A Silva Jr
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1897-4287-12-8) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interest.

Authors’ contributions

WASJ conceived the study. NMC participated in the study design, conducted the mutation analysis, statistical analysis and manuscript preparation. VEFF participated in the study design, acquisition of data, statistical analysis and revised the manuscript critically. All authors read and approved the final manuscript.

Abstract

Background

Approximately 5-10% of breast cancers are hereditary. Among hereditary syndromes, Hereditary Breast and Ovarian Cancer Syndrome (HBOC) and Li-Fraumeni Syndrome (LFS) have received the most attention. HBOC is due to mutations in the BRCA1 and BRCA2 genes and is characterized by breast adenocarcinoma and/or epithelial ovarian carcinoma. LFS is associated with germline mutations in TP53; the most frequent cancer types associated with this syndrome are sarcoma, breast cancer, leukemia, brain tumors and adrenocortical carcinomas. Other cancers related to LFS are found at lower frequencies. In Brazil, especially in the southern part of the country, a specific mutation in the TP53 gene, TP53 p.R337H, occurs at a high frequency in childhood adrenocortical tumors. It has been proposed that this mutation increases breast cancer risk in southern Brazilian women.

Methods

We carried out a case-control study to determine the prevalence of the TP53 p.R337H mutation in 28 female cancer patients attended at the Cancer Genetic Counseling Service of the General Hospital of the University of São Paulo Medical School of Ribeirão Preto who fulfilled Hereditary Breast and Ovary Cancer Syndrome genetic test criteria compared to healthy woman (controls). TP53 p.R337H mutation status was determined using the High Resolution Melting (HRM) method, followed by DNA sequencing. Fisher’s test was used to compare the prevalence of TP53 p.R337H in the patient and control groups.

Results

Two of the breast cancer cases (7.1%) and none of the controls carried the TP53 p.R337H mutation. At the time of the investigation, both cases fulfilled testing criteria for Hereditary Breast and Ovary Cancer Syndrome but not Li-Fraumeni or Li-Fraumeni-like Syndrome, based on genetic testing criteria of NCCN Clinical Practice Guidelines in Oncology (v.1.2010).

Conclusions

We suggest that genetic screening of Brazilian breast cancer patients who fulfill Hereditary Breast and Ovary Cancer Syndrome criteria and have a family history that includes other tumors of the LFS/LFL spectrum be tested for the TP53 p.R337H mutation.
Zusatzmaterial
Authors’ original file for figure 1
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Authors’ original file for figure 2
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Authors’ original file for figure 3
13053_2013_476_MOESM3_ESM.tiff
Literatur
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