A total of 965 Caucasian patients with RA (cases) and 988 healthy control individuals (controls) were genotyped for five variants in the IL-4/IL-13 gene cluster (5q31.1) and two functional variants IL-4Ralpha (16p12.1).     ///    These results indicate that common variants of the IL-4/IL-13 pathway do not significantly contribute to RA susceptibility and radiological severity.. 