CC-885 is a potent Cereblon Modulator with potent antitumor activity mediated through the degradation of GSPT1. was demonstrated to mediate antitumor effects through the recruitment and degradation of G1 to S phase transition 1 protein (GSPT1). GSPT1 (also named eRF3a) is a translation termination factor that binds eukaryotic translation termination factor 1 (eFR1) to mediate stop codon recognition and nascent protein release from the ribosome.