Park et al. (2016) reported on 214 IVF cycles in women with adenomyosis, comparing the IVF outcomes of fresh embryo transfer (ET) cycles with (N=147 – group A), or without (N=105 – group B) gonadotropin-releasing hormone (GnRH) agonist pre-treatment, and of frozen-thawed embryo transfer (FET) cycles following GnRH agonist treatment (N=43 – Group C). Here, GNRH1 is linked to adenomyosis.