PGR and adenomyosis: The majority of studies in this review reported no significant differences (Tamaya et al., 1979; Zhang et al., 2008; Nie et al., 2009; Mehasseb et al., 2011; Samartzis et al., 2023) or reduced PR immunoexpression in adenomyosis lesions compared with matched eutopic endometrium (Zhang et al., 1999; Ueki et al., 2004; Khan et al., 2016).