Treatment of Adolescent Endometriosis Before, During, and After Use of Gonadotropin-Releasing Hormone Agonists: A Retrospective Cohort Study.

To explore the use duration of a gonadotropin-releasing hormone agonists (GnRHa) plus add-back in adolescents with laparoscopically confirmed endometriosis and the treatment course before and after GnRHa therapy. Retrospective cohort study. We identified 51 subjects with laparoscopically confirmed endometriosis who had participated in a randomized trial of a GnRHa plus add-back as adolescents between 2008 and 2012. Electronic medical records were reviewed to obtain demographic data, clinical characteristics, and treatment outcomes after trial completion. The study was deemed IRB exempt. The average age of participants during trial enrollment was 17.9 ± 1.7 years. Thirty-three participants had stage I endometriosis (65%). The most common treatments trialed before GnRHa therapy were combined oral contraceptives (n = 47, 92%) and progestin-only pills (n = 23, 45%). The average duration of GnRHa use during the trial was 9.5 ± 3.5 months; 34 subjects (67%) completed the 1-year trial. After trial completion, 23 subjects (45%) continued to use a GnRHa with add-back therapy. The mean duration of additional GnRHa use was 31.7 ± 28.6 months, and the longest identified duration was an additional 96 months. Twenty-four subjects switched to other hormonal treatments after trial participation, most commonly oral progestins (n = 15) or combined oral contraceptives (n = 6). Thirteen participants (25%) returned to a therapy that had been trialed before GnRHa use. Almost half the participants in this cohort continued to use a GnRHa with add-back for treatment of endometriosis beyond the 12-month recommended duration. Treatment varied widely after discontinuation of GnRHa, with many participants returning to previously trialed medical therapies. [ABSTRACT FROM AUTHOR]