RARA and posterior cortical atrophy: ATRA and the non-hydrolysable pan-RAR agonist TTNPB [55] inhibited the growth of the three PCa lines at concentrations >10−8 M. The proliferation of LNCaP cells was markedly increased by exposure to 10−10 to 10−8 M ATRA, TTNPB, and the RARγ agonist AGN205327.