Transvaginal Mesh Compared With Native Tissue Repair for Pelvic Organ Prolapse.

OBJECTIVE: To compare the safety and effectiveness of transvaginal mesh repair and native tissue repair, in response to a U.S. Food and Drug Administration (FDA) 522 study order to assess co-primary endpoints of superiority and noninferiority. METHODS: This was a prospective, nonrandomized, parallel cohort, multi-center trial comparing transvaginal mesh with native tissue repair for the treatment of pelvic organ prolapse. The primary endpoints were composite treatment success at 36 months comprised of anatomical success (defined as pelvic organ prolapse quantification [POP-Q] point Ba≤0 and/or C≤0), subjective success (vaginal bulging per the PFDI-20 [Pelvic Floor Distress Inventory]), and retreatment measures, as well as rates of serious device-related or serious procedure-related adverse events. Secondary endpoints included a composite outcome similar to the primary composite outcome but with anatomical success defined as POP-Q point Ba<0 and/or C<0, quality-of-life measures, mesh exposure and mesh- and procedure-related complications. Propensity score stratification was applied. RESULTS: Primary endpoint composite success at 36 months was 89.3% (201/225) for transvaginal mesh and 80.2% (389/485) for native tissue repair, demonstrating noninferiority at the preset margin of 12% (propensity score-adjusted treatment difference 6.5%, 90% CI -0.2% to 13.2%). Using the primary composite endpoint, transvaginal mesh was not superior to native tissue repair (P=.056). Using the secondary composite endpoint, superiority of transvaginal mesh over native tissue repair was noted (P=.009), with a propensity score-adjusted difference of 10.6% (90% CI 3.3-17.9%) in favor of transvaginal mesh. Subjective success for both the primary and secondary endpoint was 92.4% for transvaginal mesh, 92.8% for native tissue repair, a propensity score-adjusted difference of -4.3% (CI -12.3% to 3.8%). For the primary safety endpoint, 3.1% (7/225) of patients in the transvaginal mesh (TVM) group and 2.7% (13/485) of patients in the native tissue repair (NTR) group developed serious adverse events, demonstrating that transvaginal mesh was noninferior to native tissue repair (-0.4%, 90% CI -2.7% to 1.9%). Overall device-related and/or procedure-related adverse event rates were 35.1% (79/225) in the TVM group and 46.4% (225/485) in the NTR group (-15.7%, 95% CI -24.0% to -7.5%). CONCLUSION: Transvaginal mesh repair for the treatment of anterior and/or apical vaginal prolapse was not superior to native tissue repair at 36 months. Subjective success, an important consideration from the patient-experience perspective, was high and not statistically different between groups. Transvaginal mesh repair was as safe as native tissue repair with respect to serious device-related and/or serious procedure-related adverse events. FUNDING SOURCE: This study was sponsored by Boston Scientific and developed in collaboration with FDA personnel from the Office of Surveillance and Biometrics, Division of Epidemiology. CLINICAL TRIAL REGISTRATION: ClinicalTrials.gov, NCT01917968.

Interacting hepatic PAI-1/tPA gene regulatory pathways influence impaired fibrinolysis severity in obesity.

Fibrinolysis is initiated by tissue-type plasminogen activator (tPA) and inhibited by plasminogen activator inhibitor 1 (PAI-1). In obese humans, plasma PAI-1 and tPA proteins are increased, but PAI-1 dominates, leading to reduced fibrinolysis and thrombosis. To understand tPA-PAI-1 regulation in obesity, we focused on hepatocytes, a functionally important source of tPA and PAI-1 that sense obesity-induced metabolic stress. We showed that obese mice, like humans, had reduced fibrinolysis and increased plasma PAI-1 and tPA, due largely to their increased hepatocyte expression. A decrease in the PAI-1 (SERPINE1) gene corepressor Rev-Erbα increased PAI-1, which then increased the tPA gene PLAT via a PAI-1/LRP1/PKA/p-CREB1 pathway. This pathway was partially counterbalanced by increased DACH1, a PLAT-negative regulator. We focused on the PAI-1/PLAT pathway, which mitigates the reduction in fibrinolysis in obesity. Thus, silencing hepatocyte PAI-1, CREB1, or tPA in obese mice lowered plasma tPA and further impaired fibrinolysis. The PAI-1/PLAT pathway was present in primary human hepatocytes, and associations among PAI-1, tPA, and PLAT in livers from obese and lean humans were consistent with these findings. Knowledge of PAI-1 and tPA regulation in hepatocytes in obesity may suggest therapeutic strategies for improving fibrinolysis and lowering the risk of thrombosis in this setting.