Bondanelli et alalso found that circulating IGF-1 might predict functional performance during rehabilitation and ischemic stroke outcome, while another study suggested that high serum IGF-1 levels just after ischemic stroke onset are associated with neurological recovery and a better functional outcome. In fact, because the pathogenesis of stroke was complex and multifactorial, it remains to be established whether the relation is causative. Therefore, the aim of the present study was to evaluate the prognostic value of serum IGF-1 levels in a cohort of Chinese patients with acute ischemic stroke. The study also included 100 age-sex matched healthy controls, recruited contemporaneously from the same geographical area. The control subjects had no subjective symptoms of stroke, and had similar exclusion criteria as the patients. The demographical dataand history of conventional vascular risk factorswere obtained. Stroke severity 
was Gentiopicrin assessed on admission using the National Institutes of Health Stroke Scalescoreby a neurologist. Stroke subtype was classified according to TOASTcriteria. The clinical stroke syndrome was determined by applying the criteria of the Oxfordshire Community Stroke Project. In this study, we found that serum IGF-1 levels were significantly reduced in cases of first AIS compared to control cases. When adjusting for other possible risk factors, reduced IGF1 levels were independent predictor for unfavorable functional outcome and mortality, and serum IGF-1 levels #130 ng/mL were associated with an 3.31-fold increase in AIS patients with unfavorable functional outcome. Furthermore, we found that the serum IGF-1 levels dropped with increasing severity of stroke as defined by the NIHSS score, and there was an inverse correlation that linked the levels of IGF-1 to the infarct volume. Our conclusion was consistent with several pervious studies. Bondanelli et alsuggested that circulating IGF-1 may predict functional performance during rehabilitation and ischemic stroke outcome, while another study found that serum IGF-1 levels correlate to improvement of functional outcome after ischemic stroke. Similarly, De Smedt et alreported that high serum IGF-1 levels just after ischemic stroke onset are associated with neurological recovery and a better functional outcome. Interestingly, A ?berg et alfound that variation in rs7136446 of the IGF-1 gene associates with post-stroke outcome in relatively young IS patients in a Scandinavian population. In the present study, no difference in IGF-1 levels was observed between genders. Many other studies also failed to demonstrate distinction between genders. Previous studies indicated that systemic administration of IGF-1 injection results in a decreased infarct volume. We also found an inverse correlation that linked the levels of IGF-1 to the infarct volume. arterial endothelial cellswithin the atherosclerotic lesion. Macrophage accumulation is an early event in atherosclerosis. It is likely that macrophage-derived IGF enhances cellular LDL uptake and degradation and also the macrophage cholesterol esterification rate. Fourth, IGFs also serve beneficial effects at the vessel wall after injury. It is reasonable to assume that local IGF-1 production may play a role in regenerating the elastic layer. Lastly, Sohrabji et alfound that oestrogen-mediated neuroprotection is critically dependent on IGF-1 signaling, and specifically focus on microglia as the Tubeimoside-I source of IGF-1.