The mAb J591 has demonstrated excellent tumour theragnostic specificity in PCa, and in the neo‐vasculature of several solid tumours, via targeting of membrane‐expressed (FOLH1; also known as prostate‐specific membrane antigen) FOLH1.22, 24, 25, 27, 33. The gene discussed is FOLH1; the disease is posterior cortical atrophy.