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Pregnancy Outcomes in Women With a Prior Cervical Intraepithelial Neoplasia Grade 3 Diagnosis : A Nationwide

Wei He1, Pär Sparén2, Fang Fang3

  • 1Chronic Disease Research Institute, The Children's Hospital, and National Clinical Research Center for Child Health, School of Public Health, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China, Department of Nutrition and Food Hygiene, School of Public Health, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China, and Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden (W.H.).

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This summary is machine-generated.

Women with a history of cervical intraepithelial neoplasia grade 3 (CIN 3) face increased risks of preterm birth and infant infections. However, these risks appear to decrease over time, suggesting improved treatment methods may mitigate adverse pregnancy outcomes.

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Area of Science:

  • Reproductive Health
  • Gynecologic Oncology
  • Perinatal Medicine

Background:

  • Cervical intraepithelial neoplasia grade 3 (CIN 3) treatment involves procedures that may affect subsequent pregnancy outcomes.
  • Understanding these risks is crucial for patient counseling and management.

Purpose of the Study:

  • To investigate the association between a history of CIN 3 and various adverse pregnancy outcomes.
  • To compare these outcomes in a general population and within siblings to control for genetic and environmental factors.

Main Methods:

  • A population- and sibling-matched cohort study was conducted in Sweden from 1973 to 2018.
  • Data included singletons born to women with and without a CIN 3 diagnosis, with sibling comparisons to account for familial similarities.
  • Outcomes assessed included preterm birth, infection-related complications (chorioamnionitis, infant sepsis), and early neonatal death.

Main Results:

  • Women with a history of CIN 3 had significantly higher odds of preterm birth (especially extreme preterm and spontaneous preterm), chorioamnionitis, infant sepsis, and early neonatal death compared to the general population.
  • Sibling comparison analyses yielded similar results, reinforcing the association.
  • A notable trend of decreasing risk differences over time was observed for all outcomes, with risk for early neonatal death disappearing.

Conclusions:

  • A history of CIN 3 is independently associated with adverse pregnancy outcomes, even after controlling for familial factors.
  • The observed attenuation of risk over time suggests that advancements in CIN 3 treatment may be reducing adverse pregnancy outcomes.
  • Further research is needed on the impact of specific CIN 3 treatments and spontaneous abortion rates.