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BMC Cancer
Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Combinatory effect of BRCA1 and HERC2 expression on outcome in advanced non-small-cell lung cancer

Authors: Laura Bonanno, Carlota Costa, Margarita Majem, Jose-Javier Sanchez, Ignacio Rodriguez, Ana Gimenez-Capitan, Miquel Angel Molina-Vila, Alain Vergnenegre, Bartomeu Massuti, Adolfo Favaretto, Massimo Rugge, Cinta Pallares, Miquel Taron, Rafael Rosell

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

BRCA1 is a main component of homologous recombination and induces resistance to platinum in preclinical models. It has been studied as a potential predictive marker in lung cancer. Several proteins modulate the function of BRCA1. The E3 ubiquitin ligase HERC2 facilitates the assembly of the RNF8-UBC13 complex to recruit BRCA1 to DNA damage sites. The combined analysis of multiple components of the pathway leading to the recruitment of BRCA1 at DNA damage sites has the potentiality to improve the BRCA1 predictive model.

Methods

We retrospectively analyzed 71 paraffin-embedded tumor samples from advanced non-small-cell lung cancer patients treated with first-line platinum based chemotherapy and measured the mRNA expression levels of BRCA1, RNF8, UBC13 and HERC2 using real-time PCR. The mRNA expression was categorized using median value as cut-off point.

Results

The median progression-free survival of all 71 patients was 7.2 months whereas the median overall survival of the study population was 10.7 months. Among patients with low BRCA1 expression, the median PFS was 7.4 months in the presence of low HERC2 levels and 5.9 months for patients expressing high HERC2 levels (p = 0.01). The median OS was 15.3 months for patients expressing low levels of both genes and 7.4 months for those with low BRCA1 but high HERC2 (p = 0.008). The multivariate analysis showed that among patients with Eastern Cooperative Oncology Group performance status 0–1, the combined low expression of both BRCA1 and HERC2 clearly reduced the risk of progression (p = 0.03) and of death (p = 0.004).

Conclusions

These findings confirm the potentiality of integrated DNA repair components analysis in predicting the sensitivity to platinum in lung cancer. The study indicates a predictive role for HERC2 mRNA expression and paves the way for further refinement of the BRCA1 predictive model.
Appendix
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Metadata
Title
Combinatory effect of BRCA1 and HERC2 expression on outcome in advanced non-small-cell lung cancer
Authors
Laura Bonanno
Carlota Costa
Margarita Majem
Jose-Javier Sanchez
Ignacio Rodriguez
Ana Gimenez-Capitan
Miquel Angel Molina-Vila
Alain Vergnenegre
Bartomeu Massuti
Adolfo Favaretto
Massimo Rugge
Cinta Pallares
Miquel Taron
Rafael Rosell
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2339-5

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