Perfluoroalkyl substances and ovarian hormone concentrations in naturally cycling women

Objective To examine associations between environmental exposure to perfluoroalkyl substances (PFASs) and ovarian hormone concentrations in naturally cycling women. Design E2 and P were measured in saliva samples collected daily for a single menstrual cycle and concentrations of PFASs (including perfluoroctane sulfonate [PFOS] and perfluoroctanoic acid) were measured in serum samples collected during the same cycle. Setting Not applicable. Patient(s) A total of 178 healthy, naturally cycling women, aged 25–35 years. Intervention(s) None. Main Outcome Measure(s) Mean follicular E2 (cycle days −7 to −1, where 0 is the day of ovulation); mean luteal P (cycle days +2 to 10). Result(s) Among nulliparous, but not parous women, PFOS concentrations were inversely associated with E2 (β = −0.025, 95% CI −0.043, −0.007) and P (β = −0.027, 95% CI −0.048, −0.007). Similar, but weaker results were observed for perfluorooctanesulfonic acid. No associations were observed between other PFASs (including perfluoroctanoic acid) and ovarian steroid concentrations, nor were any associations noted in parous women. Conclusion(s) Our results demonstrate that PFOS and perfluorooctanesulfonic acid may be associated with decreased production of E2 and P in reproductive age women. These results suggest a possible mechanism by which PFASs affect women's health, and underscore the importance of parity in research on PFASs and women's reproductive health.