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. 2014 Apr 11;9(4):e94845.
doi: 10.1371/journal.pone.0094845. eCollection 2014.

The relationship between serum insulin-like growth factor I levels and ischemic stroke risk

Xiang Dong  1 , Geng Chang  1 , Xiao-Fei Ji  1 , Ding-Bo Tao  1 , Ying-Xin Wang  1
Affiliations

The relationship between serum insulin-like growth factor I levels and ischemic stroke risk

Xiang Dong et al. PLoS One. .

Retraction in

Abstract

Objective: The aim of the study was to assess the relationship between insulin-like growth factor I (IGF-I) serum levels and acute ischemic stroke (AIS) in a Chinese population.

Methods: All consecutive patients with first-ever AIS from August 1, 2011 to July 31, 2013 were recruited to participate in the study. The control group comprised 200 subjects matched for age, gender, and conventional vascular risk factors. IGF-I serum levels were determined by chemiluminescence immunoassay. The National Institutes of Health Stroke Scale (NIHSS) score was assessed on admission blinded to serum IGF-I levels.

Results: The median serum IGF-1 levels were significantly (P = 0.011) lower in AIS patients (129; IQR, 109-153 ng/mL) compared with control cases (140; IQR, 125-159 ng/mL). We found that an increased risk of AIS was associated with IGF-I levels ≤135 ng/mL (unadjusted OR: 4.17; 95% CI: 2.52-6.89; P = 0.000). This relationship was confirmed in the dose-response model. In multivariate analysis, there was still an increased risk of AIS associated with IGF-I levels ≤135 ng/mL (OR: 2.16; 95% CI:1.33-3.52; P = 0.002) after adjusting for possible confounders.

Conclusion: Lower IGF-I levels are significantly related to risk of stroke, independent from other traditional and emerging risk factors, suggesting that they may play a role in the pathogenesis of AIS. Thus, strokes were more likely to occur in patients with low serum IGF-I levels in the Chinese population; further, post-ischemic IGF-I therapy may be beneficial for stroke.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Serum IGF-I levels in acute ischemic stroke patients, control and normal group.
Mann–Whitney U-test. All data are medians and in-terquartile ranges (IQR). Significantly higher in stroke patients as compared to control cases (p = 0.011); Significantly higher in stroke patients as compared to normal cases (p = 0.000).
Figure 2
Figure 2. Correlation between serum IGF-I levels and others predictors.
(a) Correlation between serum IGF-I levels and age; (b) Correlation between the serum IGF-I levels and the National Institutes of Health Stroke Scale (NIHSS) score; (c) Correlation between serum IGF-I levels and Hs-CRP; (d) Correlation between serum IGF-I levels and infract volume.
See this image and copyright information in PMC

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