FDG negative tumours were associated with higher disease stage on PSMA PET (N1M0/N0M1/N1M1; 45% vs 10%, p = 0.03) and numerically higher median PSMA SUVmax (20.2 positive vs 14.3 negative; p = 0.15) that did not reach statistical significance. Here, FOLH1 is linked to neoplasm.