FOLH1 and neoplasm: The target volume defined by the PSMA density was significantly smaller (paired t-test, p < 0.0001) than the tumor size defined by the topometric CT scan: GTVCT, 27.58 ± 46.07 cm3 (0.44–258.2 cm3); BTVPSMA, 16.14 ± 29.87 cm3 (0.38–190.85 cm3) (Table 2).