A study conducted on 263 patients of the European race showed that -1562C/T SNP in the MMP9 gene was significantly correlated with the disease exacerbation in GBS patients (p = 0.01) but no relationship between this polymorphism and higher GBS incidence was observed (Geleijns et al., 2007). The gene discussed is MMP9; the disease is Guillain-Barre syndrome.