FOLH1 and posterior cortical atrophy: Related preclinical studies have shown that 99mTc-labelled PSMA molecular probe (99mTc-HYNIC-Glu-Urea-A, hereinafter referred to as 99mTc-PSMA) single–photon emission computed tomography (SPECT)/CT can clearly display PCa lesions with positive PSMA expression, and the imaging agent is quickly cleared from the blood, mainly through kidney metabolism.