Some drugs that regulate estrogen are currently used as therapy for endometriosis. However, these medical treatments have significant side effects and patients who hope to become pregnant cannot overcome infertility. To compare morphological alterations and clinical symptoms, revised American Fertility Society (r-AFS) scores were compared between patients with and without leukotriene receptor antagonist (LTR-A) treatment. LTR-A-treated cases showed significantly decreased r-AFS score. Furthermore, a significant correlation was seen between r-AFS score and LTR-A treatment period. In treated cases, clinical symptoms decreased and some patients achieved pregnancy. Morphologically, lesions in LTR-A-treated cases showed apoptotic fibroblasts and degeneration of collagen fibers. Our findings revealed that LTR-As had significant therapeutic value for the treatment of human endometriosis. Anti-LT therapy appears efficacious not only in the treatment of clinical symptoms and lesions, but also in improving fertility.
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