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. 2012 Aug 22;104(16):1251-9.
doi: 10.1093/jnci/djs315. Epub 2012 Aug 1.

Association between prediagnostic IgE levels and risk of glioma

Judith Schwartzbaum  1 , Bo Ding, Tom Borge Johannesen, Liv T N Osnes, Linda Karavodin, Anders Ahlbom, Maria Feychting, Tom K Grimsrud
Affiliations

Association between prediagnostic IgE levels and risk of glioma

Judith Schwartzbaum et al. J Natl Cancer Inst. .

Abstract

Background: Previous nested case-control studies suggest that a prediagnostic biomarker of allergy, IgE, is inversely associated with the risk of glioma, but these findings are inconsistent. The purpose of our study was to assess this association and determine how long before glioma diagnosis it may be observed.

Methods: We conducted a nested case-control study using serum specimens from the Janus Serum Bank cohort in Norway. Blood donors who were subsequently diagnosed with glioma (n = 594 case subjects), between January 1, 1974 to December 31, 2007, were matched with subjects without glioma (n = 1177 control subjects) for date of blood collection, 2-year age interval at blood collection, and sex. Respiratory allergen-specific and total IgE levels in the serum were measured using fluorescent assays. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using conditional logistic regression models stratified on sex and glioblastoma, the most common glioma subtype. Data were stratified on time from blood collection to tumor diagnosis to assess how long before glioma diagnosis the association could be observed.

Results: Among women, testing positive for allergen-specific IgE (>0.35 kU(A)/L) was associated with decreased risk of glioblastoma compared with testing negative (≤0.35 kU(A)/L; OR = 0.46, 95% CI = 0.23 to 0.93). Among both sexes combined, testing positive for total IgE (>100 kU/L) was associated with decreased risk of glioma compared with testing negative (≤100 kU/L; OR = 0.75, 95% CI = 0.56 to 0.99), and simultaneously testing positive for allergen-specific IgE and total IgE was associated with a borderline statistically significantly decreased risk of glioblastoma and glioma compared with simultaneously testing negative for these types of IgE. Testing positive for total IgE at least 20 years before diagnosis was associated with decreased risk of glioma compared with testing negative (OR = 0.54, 95% CI = 0.30 to 0.99).

Conclusion: An inverse association between IgE levels and risk of glioma was detected; the association was present at least 20 years before tumor diagnosis.

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