CXCR4 and neoplasm: We selected samples where CXCR4 RNA levels are high (Log2 ratio > 2) i.e., tumor cells which might be dependent on CXCR4 signaling, and divided those patients into GNG4 high (RNA Log2 ratio > −0.79) and GNG4 low (RNA Log2 ratio < −0.79) groups.