In addition, in order to study whether there is competitive inhibition in the tumor tissue, 20 mg/kg of unlabeled ADH-1 solution was coinjected as the block group in the PDX tumor, and the radioactive uptake value of the tumor was significantly lower than that of the non-blocking inhibition group, which was 3.75 ± 0.07% ID/g and 10.76 ± 2.16% ID/g 60 minutes after injection, respectively (p=0.006). Here, ADH1A is linked to neoplasm.