GNRH1 and endometriosis: The therapeutic perspectives for endometriosis have been directed in the last years towards the use of a variety of new medications including immunomodulatory agents (i.e. local interleukin-2r [1]), selective estrogen and progesterone receptor modulators, GnRH antagonist, angiogenic inhibitors, or the third-generation aromatase inhibitors (AI) (i.e. Anastrozole and Letrozole), systemically and/or locally administered, and eventually without the need for surgery [2–5].