The PSMA-specific uptake of [99mTcO2(DPPh-PSMAt)2]+ was significantly higher than that of either [99mTcO2(DPAn-PSMAt)2]+ and [99mTcO2(DPMEP-PSMAt)2]+ in both DU145-PSMA+ cells and LNCaP cancer cells. This evidence concerns the gene FOLH1 and cancer.