FOLH1 and cancer: In fact, 68Ga-PSMA-617 (Ki = 6.40 ± 1.02 nM) was superior to 68Ga-PSMA-11 (Ki = 12.1 ± 2.1 nM) as far as the affinity towards PSMA and efficacy of internalization (up to 17.67 6 4.34 percentage injected activity/106 LNCaP cells) into the cancer cells concerns.