Association of the intercellular adhesion molecule-1 (ICAM-1) gene polymorphisms with endometriosis: a systematic review and meta-analysis

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A meta-analysis of six studies found that ICAM-1 gene polymorphisms are associated with an increased risk of endometriosis, particularly in Caucasians.

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This paper conducted a systematic review and meta-analysis of six published case–control studies (from five articles) to assess whether ICAM-1 gene polymorphisms G241R and K469E are associated with endometriosis, estimating odds ratios across models (homozygous, dominant, codominant) using Review Manager 5.3. Across 1213 cases and 1103 controls, the overall analysis found significant increased risk under several genetic comparison models, but when restricted to studies in Hardy–Weinberg equilibrium the statistical significance disappeared; the authors also reported variable effects by ethnicity, with significant effects noted in Caucasian subgroups and non-significant/variable effects in Asian subgroups. They observed weak but non-heterogeneous findings (low I²), while explicitly noting limitations related to high heterogeneity and the reduced robustness after Hardy–Weinberg filtering. This paper is centrally about endometriosis — it meta-analyzes ICAM-1 (G241R and K469E) genetic polymorphisms as susceptibility markers for endometriosis.

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Abstract

BackgroundReported associations of the G241R and K469E polymorphisms of the intercellular adhesion molecule-1 gene (ICAM-1) gene with endometriosis have differed in magnitude.Materials and methodsIn a meta-analysis of six published case-control studies (from five articles), we estimated risk [odds ratio (OR) 95 % confidence intervals (CI)] of associations with these polymorphisms using the Review Manager 5.3 software.ResultsBased on 1213 cases and 1103 controls, overall analysis showed significant increased risk in the homozygous (OR 2.83, 95 % CI 0.99-8.10, p = 0.05), dominant (OR 1.86, 95 % CI 1.00-3.46, p = 0.05) and codominant (OR 2.15, 95 % CI 1.06-4.35, p = 0.03) models. Confined to the studies in Hardy-Weinberg Equilibrium erased the significance (OR 1.59-2.59, 95 % CI 0.81-8.22, p = 0.10-0.15). Asian effects were variable (OR 0.93-1.09, p = 0.50-0.57), but Caucasian effects were not (OR 4.09-13.60, p < 0.0001). Independent data for the late stages of endometriosis suggest protection of the ICAM-1 K469E polymorphism among the Asians (OR 0.91-0.95, p = 0.35-0.71). These effects were weak but non-heterogeneous (P heterogeneity = 0.17-0.57, I (2) = 0-40 %).ConclusionIn summary, strengths of the overall effects were consistency, significance and robustness but limited by their high heterogeneity. These strengths and limitations were also observed in the Caucasian subgroup which when tested for interaction against the contrasting Asian effects, highlighted Caucasian susceptibility (p = 0.004-0.01). The findings are an interplay of strengths and limitations, which warrant awareness of their interpretation as susceptibility markers for this disorder.
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Abstract

Background Reported associations of the G241R and K469E polymorphisms of the intercellular adhesion molecule-1 gene (ICAM-1) gene with endometriosis have differed in magnitude.

Materials and methods

In a meta-analysis of six published case–control studies (from five articles), we estimated risk [odds ratio (OR) 95 % confidence intervals (CI)] of associations with these polymorphisms using the Review Manager 5.3 software.

Results

Based on 1213 cases and 1103 controls, overall analysis showed significant increased risk in the homozygous (OR 2.83, 95 % CI 0.99–8.10, p = 0.05), dominant (OR 1.86, 95 % CI 1.00–3.46, p = 0.05) and codominant (OR 2.15, 95 % CI 1.06–4.35, p = 0.03) models. Confined to the studies in Hardy–Weinberg Equilibrium erased the significance (OR 1.59–2.59, 95 % CI 0.81–8.22, p = 0.10–0.15). Asian effects were variable (OR 0.93–1.09, p = 0.50–0.57), but Caucasian effects were not (OR 4.09–13.60, p < 0.0001). Independent data for the late stages of endometriosis suggest protection of the ICAM-1 K469E polymorphism among the Asians (OR 0.91–0.95, p = 0.35–0.71). These effects were weak but non-heterogeneous (P heterogeneity = 0.17–0.57, I 2 = 0–40 %).

Conclusion

In summary, strengths of the overall effects were consistency, significance and robustness but limited by their high heterogeneity. These strengths and limitations were also observed in the Caucasian subgroup which when tested for interaction against the contrasting Asian effects, highlighted Caucasian susceptibility (p = 0.004–0.01). The findings are an interplay of strengths and limitations, which warrant awareness of their interpretation as susceptibility markers for this disorder. Similar content being viewed by others

References

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Condition tags

endometriosis

MeSH descriptors

Endometriosis Intercellular Adhesion Molecule-1 Asian People Asian People Case-Control Studies Endometriosis Female Genetic Predisposition to Disease Humans Intercellular Adhesion Molecule-1 Middle Aged Odds Ratio Polymerase Chain Reaction Polymorphism, Genetic Risk White People White People

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