CXCR4 and ovarian carcinoma: CXCR4 has been shown to be a predictor of poor survival in nasopharyngeal carcinoma (Wang et al, 2005), renal cell carcinoma (Wang et al, 2009), gastrointestinal tumours (Schimanski et al, 2008) and ovarian cancer (Jiang et al, 2006).