In humans, Snail mRNA expression has been detected in biopsies or resected tissue samples from patients with breast cancer (Blanco et al, 2002), gastric cancer (Rosivatz et al, 2002), hepatocellular carcinomas (Jiao et al, 2002), oral squamous cell carcinoma (Yokoyama et al, 2001), and ovarian carcinoma (Elloul et al, 2006). This evidence concerns the gene SNAI1 and ovarian carcinoma.