SMAD3 and posterior cortical atrophy: As shown in Fig. 4E, SD208, an inhibitor of TGF‐β signaling (Fournier et al., 2015), reversed the promigration and pro‐invasion effect of PCAT7 overexpression on PCa cells, whereas constitutively active SMAD3 mutants (Cai et al., 2017) reversed the inhibitory effect of PCAT7 knockdown on the migration and invasion of PCa cells.