FOLH1 and prostate cancer: To assess the specificity of the new radiotracers for PSMA, [99mTc]Tc-DP1-PSMAt and [99mTc]Tc-DP2-PSMAt (100 kBq) were each incubated with DU145-PSMA+ prostate cancer cells (DU145 cells transfected to express PSMA receptor) (22).