The objectives of this study were: to identify the frequency of the CDX2polymorphisms of the promoter region and the polymorphisms of the exons 2 and 3 ofthe VDR gene in a sample of asthmatic patients, as well as to determine if there isany relationship between these polymorphisms and the diagnosis of asthma, VD andcalcium serum levels, and the need for corticosteroids. The gene discussed is VDR; the disease is asthma.