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Published in: BMC Cancer 1/2011

Open Access 01-12-2011 | Research article

Searching for early breast cancer biomarkers by serum protein profiling of pre-diagnostic serum; a nested case-control study

Authors: Annemieke WJ Opstal-van Winden, Esmeralda JM Krop, Monica H Kåredal, Marie-Christine W Gast, Christian H Lindh, Marina C Jeppsson, Bo AG Jönsson, Diederick E Grobbee, Petra HM Peeters, Jos H Beijnen, Carla H van Gils, Roel CH Vermeulen

Published in: BMC Cancer | Issue 1/2011

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Abstract

Background

Serum protein profiles have been investigated frequently to discover early biomarkers for breast cancer. So far, these studies used biological samples collected at or after diagnosis. This may limit these studies' value in the search for cancer biomarkers because of the often advanced tumor stage, and consequently risk of reverse causality. We present for the first time pre-diagnostic serum protein profiles in relation to breast cancer, using the Prospect-EPIC (European Prospective Investigation into Cancer and nutrition) cohort.

Methods

In a nested case-control design we compared 68 women diagnosed with breast cancer within three years after enrollment, with 68 matched controls for differences in serum protein profiles. All samples were analyzed with SELDI-TOF MS (surface enhanced laser desorption/ionization time-of-flight mass spectrometry). In a subset of 20 case-control pairs, the serum proteome was identified and relatively quantified using isobaric Tags for Relative and Absolute Quantification (iTRAQ) and online two-dimensional nano-liquid chromatography coupled with tandem MS (2D-nanoLC-MS/MS).

Results

Two SELDI-TOF MS peaks with m/z 3323 and 8939, which probably represent doubly charged apolipoprotein C-I and C3a des-arginine anaphylatoxin (C3adesArg), were higher in pre-diagnostic breast cancer serum (p = 0.02 and p = 0.06, respectively). With 2D-nanoLC-MS/MS, afamin, apolipoprotein E and isoform 1 of inter-alpha trypsin inhibitor heavy chain H4 (ITIH4) were found to be higher in pre-diagnostic breast cancer (p < 0.05), while alpha-2-macroglobulin and ceruloplasmin were lower (p < 0.05). C3adesArg and ITIH4 have previously been related to the presence of symptomatic and/or mammographically detectable breast cancer.

Conclusions

We show that serum protein profiles are already altered up to three years before breast cancer detection.
Appendix
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Metadata
Title
Searching for early breast cancer biomarkers by serum protein profiling of pre-diagnostic serum; a nested case-control study
Authors
Annemieke WJ Opstal-van Winden
Esmeralda JM Krop
Monica H Kåredal
Marie-Christine W Gast
Christian H Lindh
Marina C Jeppsson
Bo AG Jönsson
Diederick E Grobbee
Petra HM Peeters
Jos H Beijnen
Carla H van Gils
Roel CH Vermeulen
Publication date
01-12-2011
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2011
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-11-381

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