('transforming growth factor beta1'/exp OR 'tfg-beta1'/exp OR 'tfg-beta1') AND ('polymorphism'/exp OR 'polymorphism' OR 'genetic variation'/exp OR 'genetic variation' OR 'snp') AND ('hepatitis c'/exp OR 'hcv') AND ('cirrhosis'/exp OR 'liver cirrhosis'/exp OR 'liver fibrosis'/exp OR 'hepatic fibrosis'/exp OR 'hepatic cirrhosis'/exp). The gene discussed is TFG; the disease is Cirrhosis.