RPS6KA3 and choriocarcinoma: In choriocarcinoma cell lines, the depletion of ribosomal protein S6 kinase (RSK2) or protein phosphatase methylesterase 1 (PPME1) inhibits cell migration and invasion, which is similar to that after knockdown of IGF2BP1 that controls RSK2 and PPME expression, whereas it did not influence cellular proliferation and morphology [100], indicating that IGF2BP1 promotes choriocarcinoma cell migration and invasion partly via the effect of RSK2 and PPME1.