FOLH1 and pachyonychia congenita: This result is in line with the prospective study by Ferraro et al., who performed PET/MRI-guided biopsies in 42 PC patients, and reported a patient-based sensitivity, specificity and accuracy for significant PC of 96%, 81%, and 90%, respectively, with only one patient being diagnosed with a PSMA-negative PC (Ferraro et al. 2021).