Study of Gene Polymorphisms Involved in the Metabolism and Action of Vitamin D in Amyotrophic Lateral Sclerosis

Inclusion Criteria: * The primary inclusion criterium is the same for that of the parent biological collection, i.e. the patients fulfill requirements for probable or definite Amyotrophic Lateral Sclerosis as defined by revised international criteria (Brooks et al 2000). * Additionally, included patients were followed-up by doctors at the University Hospital of Montpellier, thus enabling verification of Amyotrophic Lateral Sclerosis criteria over time. Exclusion Criteria: * The patient has a familial form of Amyotrophic Lateral Sclerosis (autosomic dominant or recessive types) with or without a mutation of one of the 3 genes known to be responsible for familial forms (SOD1, TARDBP, FUS). See Bender (1998).