KLK3 and neoplasm: Additionally, in the same cohort of mCRPC patients, we could previously indicate that parameters of [68Ga]Ga-PSMA-11 whole-body PET scan such as total tumor volume correlate positively with levels of serum PSA and can reliably assess patients’ responses to PSMA-RLT and systematic antihormonal and chemotherapies [17, 21].