“…This is clearly evident in our baboon model of simulated pregnancy. Following the induction of endometriosis, the eutopic endometrium is unresponsive to chorionic gonadotrophin (CG) stimulation, and the expression of a number of genes thought to be critical for implantation and decidualization are markedly altered (Fazleabas et al, 2003;Hastings et al, 2008). The examination of steroid hormone responsiveness can elucidate the effectiveness of hormonal treatment of endometriosis and corroborate the finding of progesterone therapy resistance in some cases of endometriosis (Bulun et al, 2006;Burney et al, 2007).…”