Email updates

Keep up to date with the latest news and content from BMC Cancer and BioMed Central.

Open Access Research article

Molecular profiles of screen detected vs. symptomatic breast cancer and their impact on survival: results from a clinical series

Anna Crispo1*, Maddalena Barba2, Giuseppe D’Aiuto3, Michelino De Laurentiis4, Maria Grimaldi1, Massimo Rinaldo3, Giuseppina Caolo1, Massimiliano D’Aiuto3, Immacolata Capasso3, Emanuela Esposito3, Alfonso Amore1, Maurizio Di Bonito5, Gerardo Botti5 and Maurizio Montella1

Author affiliations

1 Epidemiology Unit, National Cancer Institute G. Pascale Foundation, Via Mariano Semmola, Naples 80131, Italy

2 Scientific Direction-Division of Medical Oncology B, Regina Elena National Cancer Institute, Via Elio Chianesi 53, Rome 00144, Italy

3 Breast Unit, National Cancer Institute G. Pascale Foudation, Via Mariano Semmola, Naples 80131, Italy

4 Medical Oncology, National Cancer Institute G. Pascale Foundation, Via Mariano Semmola, Naples 80131, Italy

5 Pathology Unit, National Cancer Institute G Pascale Foundation, Via Mariano Semmola, Naples 80131, Italy

For all author emails, please log on.

Citation and License

BMC Cancer 2013, 13:15  doi:10.1186/1471-2407-13-15

Published: 10 January 2013

Abstract

Background

Stage shift is widely considered a major determinant of the survival benefit conferred by breast cancer screening. However, factors and mechanisms underlying such a prognostic advantage need further clarification. We sought to compare the molecular characteristics of screen detected vs. symptomatic breast cancers and assess whether differences in tumour biology might translate into survival benefit.

Methods

In a clinical series of 448 women with operable breast cancer, the Kaplan-Meier method and the log-rank test were used to estimate the likelihood of cancer recurrence and death. The Cox proportional hazard model was used for the multivariate analyses including mode of detection, age at diagnosis, tumour size, and lymph node status. These same models were applied to subgroups defined by molecular subtypes.

Results

Screen detected breast cancers tended to show more favourable clinicopathological features and survival outcomes compared to symptomatic cancers. The luminal A subtype was more common in women with mammography detected tumours than in symptomatic patients (68.5 vs. 59.0%, p=0.04). Data analysis across categories of molecular subtypes revealed significantly longer disease free and overall survival for screen detected cancers with a luminal A subtype only (p=0.01 and 0.02, respectively). For women with a luminal A subtype, the independent prognostic role of mode of detection on recurrence was confirmed in Cox proportional hazard models (p=0.03). An independent role of modality of detection on survival was also suggested (p=0.05).

Conclusions

Molecular subtypes did not substantially explain the differences in survival outcomes between screened and symptomatic patients. However, our results suggest that molecular profiles might play a role in interpreting such differences at least partially.

Further studies are warranted to reinterpret the efficacy of screening programmes in the light of tumour biology.

Keywords:
Breast cancer; Mode of detection; Screening; Molecular categories; Survival outcomes