CXCR4 and neoplasm: A significant negative linear correlation was found between tumor growth and CXCL12 (r = −0.573, r2 = 0.329, p = 0.008, n = 20), while a positive linear correlation emerged with CXCR4 (r = 0.448, p = 0.037, r2 = 0.201, n = 23).