FOLH1 and Familial prostate cancer: Apart from its well known strong expression in prostate cancer cells, immunohistochemical examination of different solid cancer types, such as clear cell renal carcinoma or lung cancer, demonstrated, in addition to a substantial immunohistochemical PSMA expression, a high tracer accumulation after 68Ga-PMSA-PET/CT imaging [34,35,36,37,38,39,40].