CTDSP1 and acute promyelocytic leukemia: SCPs, identified as SCP1 (protein-encoding gene Ctdsp1), SCP2, and SCP3, are involved in the TGF-β pathway and dephosphorylate distinct oncoproteins such as Snail, promyelocytic leukemia, and c-Myc (Knockaert et al., 2006; Wrighton et al., 2006; Wu et al., 2009; Lin et al., 2014).