FOLH1 and xerostomia: In using the RBE5 metric to compare the dosimetry approximations of 212Pb-CA012 with those of 213Bi-PSMA-617 and 225Ac-PSMA-617 (Table 3), we assume that the MTD of 212Pb-CA012 would be approximately 150 MBq per cycle regarding acute haematological toxicity and xerostomia, while the cumulative dose to the kidneys, the dose-limiting organ, could be about 400–600 MBq.