The patients excluded from the analysis (n = 3) based on the diagnosis of the metastasis prior to the primary tumour detection still showed accelerated metastatic dissemination to the brain only if the vasculature was PSMA‐positive (Mantel‐Cox P = 0.012/Breslow P = 0.009) (Table S1, Figure S3A) but not the tumour cells (Mantel‐Cox P = 0.135/Breslow P = 0.046) (Table S1, Figure S3B). Here, FOLH1 is linked to neoplasm.