The tumor-to-brain, tumor-to-heart, tumor-to-lung, and tumor-to-muscle ratios of 18F-Alfatide were 5.22 ± 1.83, 3.68 ± 0.67, 5.28 ± 0.92, and 4.64 ± 1.49, respectively, whereas those of 18F-FDG PET were 2.33 ± 0.46, 1.00 ± 0.29, 2.38 ± 0.77, and 5.27 ± 1.70, respectively. Here, SMUG1 is linked to neoplasm.