CD44 and gastric cancer: While some studies found no correlation between total CD44 and/or CD44v6 expression and clinical outcomes of patients with gastric cancer [191,192], conversely, the meta-analysis of Fang et al. [193] revealed that overexpression of total CD44 and/or CD44v6 is positively correlated with the TNM stage, T category, N category, invasion and distant metastasis.