KLK3 and neoplasm: Indeed, in patients with PSA values above 1 ng/ml and a dominant PSMA%neg of 50% or more, 68Ga-PSMA-11-PET were either negative or likely underestimating the tumour burden as shown in Figure 5C, where two small lymph nodes were the only PSMA-positive findings at a PSA of 10.4 ng/ml.