Association between novel per- and poly-fluoroalkyl substances and premature ovarian insufficiency: a case-control study.

STUDY QUESTION

Do novel per- and poly-fluoroalkyl substances (Novel PFAS) have associations with premature ovarian insufficiency (POI)?

SUMMARY ANSWER

Hexafluoropropylene oxide dimer acid (HFPO-DA), perfluorobutanoic acid (PFBA), perfluoropentanoic acid (PFPeA), and perfluoropentanesulfonic acid (PFPeS) are associated with an increased risk of POI, and the effect is worse with exposure to mixtures.

WHAT IS KNOWN ALREADY

As public health concerns following Novel PFAS exposure are rising globally, there is a need to understand the exact association between Novel PFAS and various diseases. Epidemiologic studies suggest traditional PFAS exposures adversely affect women's reproductive health, but the association between exposure to Novel PFAS and POI remains unclear.

STUDY DESIGN SIZE DURATION

A retrospective research study, including 371 women, with (case group, n = 151) and without POI (control group, n = 220), was conducted between June 2023 and May 2024.

PARTICIPANTS/MATERIALS SETTING METHODS: Thirteen types of Novel PFAS and basal concentrations of FSH, LH, estradiol (E2), and anti-Müllerian hormone (AMH) in plasma samples were measured in plasma samples collected during the early follicular phase (Days 2-5) of a natural menstrual cycle. In addition, characteristics of participants were collected. Both adjusted logistic regression and Bayesian kernel machine regression (BKMR) were used to evaluate associations between Novel PFAS (alone or as a mixture) and POI. Effect modification by age was also investigated.

MAIN RESULTS AND THE ROLE OF CHANCE

The concentrations of HFPO-DA, PFBA, PFPeA, and PFPeS in the case group were significantly higher than in the reference group. The adjusted logistic regression models demonstrated positive associations between plasma concentrations of HFPO-DA, PFBA, PFPeA, and PFPeS with the risk of POI [OR = 2.89 (95% CI: 1.84-4.53), 1.54 (95% CI: 1.17-2.02), 3.12 (95% CI: 2.20-4.43), and 2.07 (95% CI: 1.31-3.27), respectively, per 2.7-fold increase in Novel PFAS concentrations]. High concentrations of Novel PFAS showed a negative correlation with AMH and antral follicle count (AFC), but a positive correlation with FSH. After controlling for other covariates, HFPO-DA, PFBA, PFBS, PFPeA, and PFPeS were the major contributors based on the BKMR models.

LIMITATIONS REASONS FOR CAUTION

False positives cannot be ruled out. Therefore, experiments on PFBA, PFPeA, PFPeS, and HFPO-DA also need to be conducted in animal models.

WIDER IMPLICATIONS OF THE FINDINGS

Our study is the first to discover the impact of Novel PFAS on the incidence of POI, with an investigation of indicators such as AMH, FSH, and AFC. Considering increasingly severe environmental pollution, our research results provide a broader understanding of the impact of environmental endocrine disruptors on ovarian function, and suggest that women of reproductive age should reduce their exposure to Novel PFAS.

STUDY FUNDING/COMPETING INTERESTS: This work was supported by the National Key Research and Development Project of China (2022YFC2703002), National Natural Science Foundation of China (U24A20658, 82371726), Innovative Research Team of High-Level Local Universities in Shanghai (SHSMU-ZDCX20212200), Shanghai Hospital Development Center Foundation (SHDC22022303, SHDC22022201), and Key project of Medical and Industrial intersection of Shanghai Jiao Tong University (YG2023ZD27), as well as Reproductive Medicine Research Project of the Chinese Red Cross Foundation (HSZH2024GFYZQ) and Open Fund Project of Shanghai Key Laboratory of Embryogenic Diseases (shelab2023ZD02). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The authors declare that they have no competing interests.

TRIAL REGISTRATION NUMBER

N/A.