Although weak to moderate CXCR4 expression could be corroborated by IHC in 10/11 cases, <sup>18</sup>F-FDG PET/CT detected significantly more tumor lesions (102 vs. 42; total lesions, <i>n</i> = 107; <i>p</i> < 0.001). This evidence concerns the gene CXCR4 and neoplasm.