RCOR2 and breast cancer: Visible inhibition of Hormone ER couid be seen significantly associated with RCOR1 and RCOR2, whereas activation of this signaling pathway strongly associated with RCOR3. Recently, Martinez et al. has come up with that RCORs (CoREST) drive the tumorgenesis of ER + breast cancer and induce resistantance to endocrine therapy by switching the recruiting site of the complex (Garcia-Martinez et al., 2022).