CD248 and neoplasm: For group 2, at 24 h, the uptake in TEM-1-positive tumor (21.5 ± 7.5% IA/g) was 2.4-fold higher than the one in TEM-1-negative tumor (9.0 ± 4.1% IA/g), showing the specificity of the antibody for TEM-1 (Figure S2).