Risk factors for recurrence of external genital endometriosis after surgical treatment: prospective cohortant study

Objectives of the study: improve early non-invasive diagnosis of external genital endometriosis (EGE) using the mass spectrometry method, and determine the risk factors for recurrence of EGE after surgical treatment. Material and methods: a prospective cohort study included 100 patients with EGE who underwent surgical treatment during the 2014 to 2016 period. The EGE diagnosis was made on the basis of diagnostic and therapeutic laparoscopic findings and finally confirmed at histological exam. All patients underwent blood sampling before and after surgical treatment to detect recurrence of endometriosis using direct mass spectrometry method. Results: recurrences of EGE were diagnosed in 22% of patients at 18–36 months postoperatively. High incidence of recurrent EGE was reported in the group of patients who did not receive post-surgical hormonal therapy. The hormone therapy with dienogest 2 mg for 6-9 months, as well as with goserelin 3.6 mg for 3-6 months showed the greatest efficacy for the prevention of recurrent EGE. Significant predictive factors of recurrence after surgical treatment for EGE include intensive acyclic pelvic pain; presence of surgical interventions for the history of EGE; infertility; stimulation of ovulation with hormonal drugs as part of the Assisted Reproductive Technologies Program; degree 3-4 disease spread; pronounced adhesions of the small pelvis; infiltrative forms of endometriosis; endometrioid cysts of large size; bilateral ovarian lesions. The plasma lipid profile including determination of phosphatidylcholines, phosphoethanolamines, diglyceride and sphingomyelin in the patients with endometriosis provides an approach for noninvasive early diagnosis of recurrence of this disease by mass spectrometry (sensitivity 93%, specificity 95%). Conclusion: This study developed an individual comprehensive approach to the prevention of recurrent EGE, including surgical treatment, hormonal therapy and diagnosis of the disease at an early stage of development. Timely administration of a-GnRH or dienogest 2 mg at the post-surgery stage is associated with a minimal or total absence of recurrent EGE. The administration of COCs showed no efficacy in preventing the recurrence of EGE, and therefore COCs cannot be recommended as a prophylactic drug, but exclusively for contraceptive use.

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