Concordant release of glycolysis proteins into the plasma preceding a diagnosis of ER+ breast cancer

Menée sur des échantillons de plasma prélevés jusqu'à 74 semaines avant le diagnostic d'un cancer du sein ER+ chez 420 patientes, cette étude identifie la présence de protéines du métabolisme glycolytique

• Cancer Research, sous presse, 2012 (résumé)

Résumé en anglais :
Although the identification of peripheral blood biomarkers would enhance early detection strategies for breast cancer, the discovery of protein markers has been challenging. In this study, we sought to identify coordinated changes in plasma proteins associated with breast cancer based on large scale quantitative mass spectrometry. We analyzed plasma samples collected up to 74 weeks prior to diagnosis from 420 ER+ cases and matched controls enrolled in the Women's Health Initiative cohort. A gene set enrichment analysis was applied to 467 quantified proteins linking their corresponding genes to particular biological pathways. Based upon differences in the concentration of individual proteins, glycolysis pathway proteins exhibited a statistically significant difference between cases and controls. In particular, the enrichment was observed among cases in which blood was drawn closer to diagnosis (effect size for the 0-38 weeks pre-diagnostic group: 1.91; p-value:8.3E-05). Analysis of plasmas collected at the time of diagnosis from an independent set of cases and controls confirmed upregulated levels of glycolysis proteins among cases relative to controls. Together, our findings indicate that the concomitant release of glycolysis proteins into the plasma is a pathophysiological event that precedes a diagnosis of ER+ breast cancer.

NBC n° 125 du 28 February 2012

Mots clés : Sein; Dépistage, diagnostic et pronostic (Découverte de technologies et de biomarqueurs)