The tumor-targeting capabilities and overall biodistribution patterns of GAS1/2/3-radioligands were studied in immunosuppressed mice bearing a twin xenograft model, namely subcutaneous tumors from either HEK293-CCK2i4svR or wtHEK293 cells (Figure 4, Tables S3–S9 in Supplementary File). This evidence concerns the gene GAS1 and neoplasm.