CXCR4 and neoplasm: As seen in Table 4, the results showed that elevated CXCR4 expression was associated with advanced tumor stages (OR 2.95, 95% CI 1.37–6.34, P = 0.006, I2 = 64.1%) and distant metastasis (OR 5.33, 95% CI 1.68–16.94, P = 0.005, I2 = 82.1%) in the Asian group.