JOURNAL ARTICLE
REVIEW

Clinical efficacy of add-back therapy in treatment of endometriosis: a meta-analysis

Debin Wu, Min Hu, Li Hong, Shasha Hong, Wenjuan Ding, Jie Min, Gui Fang, Wenjun Guo
Archives of Gynecology and Obstetrics 2014, 290 (3): 513-23
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OBJECTIVE: A meta-analysis was conducted to determine the effectiveness of using gonadotropin-releasing hormone analogues (GnRH-a), both with and without hormonal add-back therapy, for the management of endometriosis.

METHODS: Cochrane library, Ovid (Embase) and Pubmed databases were searched between the years 1998 and 2013 for published, prospective, randomised controlled trials (RCT) that assessed the effectiveness of "add-back" therapy for EMs treatment. The meta-analysis was performed using RevMan V5.0. The main outcome measures were as follows: lumbar spine bone mineral density (BMD) immediately after treatment and after 6 months of follow-up; femoral neck BMD; serum estradiol levels; changes in the Kupperman index score; the pelvic pain score, including dysmenorrhoea and dyspareunia; and pelvic tenderness.

RESULTS: A total of 13 RCT, including 945 participants, were identified. The evidence suggested that "add-back" therapy was more effective for symptom relief than GnRH-a alone. BMD was significantly different when comparing "add-back" therapy to GnRH-a alone, both immediately after treatment and at 6 months. The "add-back" therapy increased serum oestrogen and did not reduce the efficacy of GnRH-a for treating dysmenorrhoea and dyspareunia. A variety of add-back regimens had a same effect for the treatment of endometriosis.

CONCLUSIONS: "Add-back" therapy, based on the GnRH-a dose, does not reduce the efficacy of using GNRH-a for the management of endometriosis. "Add-back" therapy reduced the occurrence of side effects that can occur with GnRH-a therapy alone, such as osteoporosis and menopausal syndrome. There were no statistically significant differences when comparing the effectiveness of a variety of "add-back" regimens to each other.

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