Oncotarget

Research Papers:

Genetic alterations detected by comparative genomic hybridization in BRCAX breast and ovarian cancers of Brazilian population

Paula Silva Felicio, Lucas Tadeu Bidinotto, Matias Eliseo Melendez, Rebeca Silveira Grasel, Natalia Campacci, Henrique C.R. Galvão, Cristovam Scapulatempo-Neto, Rozany Mucha Dufloth, Adriane Feijó Evangelista and Edenir Inêz Palmero _

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Oncotarget. 2018; 9:27525-27534. https://doi.org/10.18632/oncotarget.25537

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Abstract

Paula Silva Felicio1, Lucas Tadeu Bidinotto1,2, Matias Eliseo Melendez1, Rebeca Silveira Grasel1, Natalia Campacci1, Henrique C.R. Galvão3, Cristovam Scapulatempo-Neto4, Rozany Mucha Dufloth4, Adriane Feijó Evangelista1 and Edenir Inêz Palmero1,2

1Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP, Brazil

2Barretos School of Health Sciences-FACISB, Barretos, SP, Brazil

3Department of Oncogenetics, Barretos Cancer Hospital, Barretos, SP, Brazil

4Department of Pathology, Barretos Cancer Hospital, Barretos, SP, Brazil

Correspondence to:

Edenir Inêz Palmero, email: edenirip@yahoo.com.br

Keywords: BRCAX; hereditary breast cancer; hereditary breast and ovarian cancer predisposition syndrome; CNV alterations

Received: August 09, 2017     Accepted: May 14, 2018     Published: June 08, 2018

ABSTRACT

Background: About 5–10% of breast/ovarian cancers are hereditary. However, for a large proportion of cases (around 50%), the genetic cause remains unknown. These cases are grouped in a separated BRCAX category. The aim of this study was to identify genomic alterations in BRCA1/BRCA2 wild-type tumor samples from women with family history strongly suggestive of hereditary breast/ovarian cancer.

Results: A cohort of 31 Brazilian women was included in the study. Using the GISTIC algorithm, we identified 20 regions with genomic gains and 31 with losses. The most frequent altered regions were 1q21.2, 6p22.1 and 8p23.3 in breast tumors and Xq26 and Xp22.32-22.31 among the ovarian cancer cases. An interesting association identified was the loss of 22q13.31-13.32 and the presence of ovarian cancer cases. Among the genes present in the frequently altered regions, we found FGFR1, NSMCE2, CTTN, CRLF2, ERBB2, STARD3, MIR3201 and several genes of RAET and ULBP family.

Conclusions: In conclusion, our results suggest that alterations on chromosomes 1, 6, 8 and X are common on BRCAX tumors and that the loss on 22q can be associated with the presence of ovarian cancer.

Methods: DNA copy number alterations were analyzed by 60K array comparative genomic hybridization in breast and ovarian FFPE tumors.


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