Biomarkers of inflammation are associated with colorectal cancer risk in women but are not suitable as early detection markers.

TitleBiomarkers of inflammation are associated with colorectal cancer risk in women but are not suitable as early detection markers.
Publication TypeJournal Article
Year of Publication2013
AuthorsToriola AT, Cheng T-YD, Neuhouser ML, Wener MH, Zheng Y, Brown E, Miller JW, Song X, Beresford SAA, Gunter MJ, Caudill MA, Ulrich CM
JournalInt J Cancer
Volume132
Issue11
Pagination2648-58
Date Published06/2013
ISSN1097-0215
KeywordsAged, C-Reactive Protein, Case-Control Studies, Colorectal Neoplasms, Early Diagnosis, Female, Follow-Up Studies, Humans, Inflammation, Male, Middle Aged, Neoplasm Staging, Prognosis, Prospective Studies, Risk Factors, Serum Amyloid A Protein, Tumor Markers, Biological
Abstract

Initial studies have investigated the association between inflammation and colorectal cancer (CRC) using C-reactive protein (CRP) as a proinflammatory biomarker and have noted inconsistent results among women. We here report the findings from a large prospective study with repeat measurements of CRP, as well as serum amyloid A (SAA), an additional biomarker of inflammation, and risk of CRC. In the Women's Health Initiative Observational Study, we examined associations of CRP and SAA with CRC using repeat assessments (baseline and 3-year follow-up) among 953 matched case-control pairs for CRP and 966 pairs for SAA. Multivariate-adjusted conditional-logistic regression models were used with two-sided tests of significance. Receiver operating characteristic (ROC) curve analysis assessed their utility as early detection markers. Colon cancer risk (odds ratio [OR] and 95% confidence intervals) among women in the highest quintiles of CRP or SAA compared to those in the lowest quintiles was ORcolon/CRP = 1.37 (0.95-1.97, p-trend = 0.04) and ORcolon/SAA = 1.26 (0.88-1.80, p-trend = 0.10), respectively. Women with elevated concentrations of both CRP and SAA had an increased risk of ORcolon = 1.50 (1.12-2.00, p-value = 0.006) compared to those with low concentrations. No positive associations were observed with rectal cancer and weaker associations for CRC overall. Temporal changes in biomarkers more than 3 years did not predict risk. The area under the 6-month ROC curve for CRP+SAA was 0.62 (95% confidence interval = 0.55-0.68). Elevated inflammatory biomarkers are associated with an increased risk of CRC, mainly colon cancer. Nevertheless, changes in the biomarkers over time do not suggest that they merit consideration as early detection markers for CRC.

DOI10.1002/ijc.27942
Alternate JournalInt. J. Cancer
PubMed ID23161620