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Epidemiology

Risk of ovarian cancer in women who give birth after assisted reproductive technology (ART)—a registry-based Nordic cohort study with follow-up from first pregnancy

Abstract

Background

There is concern that assisted reproductive technology (ART) may increase ovarian cancer risk, but previous studies are inconclusive. We compared ovarian cancer risk for women who gave birth after ART vs natural conception.

Methods

Through linkage of nationwide registry data, we followed 3,303,880 initially nulliparous women in Denmark (1994–2014), Finland (1990–2014), Norway (1984–2015) and Sweden (1985–2015) from first pregnancy ≥22 weeks to ovarian cancer, emigration, death or end of follow-up (2014/2015). We estimated hazard ratios (HRs), adjusting for age, parity, maternal birth year and country, and for body mass index and smoking in subsamples.

Results

Mean age at first birth was 27.7 years. During a mean follow-up of 14.4 person-years, 2683 participants (0.08%) developed ovarian cancer; 135 after ART and 2548 after natural conception only (incidence rates 11.6 and 5.5 per 100,000 person-years, respectively). The risk was higher for women who ever gave birth after ART (HR 1.70, 95% confidence interval 1.42–2.03) compared to natural conception. Associations were stronger for conventional in vitro fertilisation than for intracytoplasmic sperm injection.

Conclusions

Among parous women, ART-conception was associated with a higher risk of ovarian cancer than natural conception. Further studies should decipher whether this is causal or confounded by infertility or other factors.

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Data availability

The data that support the findings of this study were used under license for the current study and are not publicly available. Restrictions apply to data availability, but data may be accessed through Statistics Denmark upon reasonable request to the authors and with permission from the relevant authorities, ethics committees and Statistics Denmark.

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Acknowledgements

We thank the staff in Nordic fertility clinics and hospitals for taking time to complete the registry notifications in their busy working day. The details and completeness of their work provide a solid foundation for our study.

Funding

The project was supported by a grant from the Norwegian Cancer Society [grant number 182356–2016]. The establishment of the CoNARTaS cohort has additionally been supported by the Nordic Trial Alliance: a pilot project jointly funded by the Nordic Council of Ministers and NordForsk [grant number 71450], the Central Norway Regional Health Authorities [grant number 46045000], the Nordic Federation of Obstetrics and Gynaecology [grant numbers NF13041, NF15058, NF16026 and NF17043], the Interreg Öresund-Kattegat-Skagerrak European Regional Development Fund (ReproUnion project).

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Authors

Contributions

AP, MG, CB, LBR, AT, UBW, AKH and SO conceived and designed the work that led to the submission and acquired the data. MSS and SO performed the statistical analyses. MSS drafted the manuscript. All authors played an important role in interpreting the results and revision of the manuscript, approved the final version and agree to be accountable for all aspects of the work.

Corresponding author

Correspondence to Marie Søfteland Sandvei.

Ethics declarations

Competing interests

The authors declare no competing interests.

Ethics approval and consent to participate

This study was approved by the registry-keeping authorities in each country. Permission was granted from the regional ethics committees in Norway (REC North 2010/1909) and Sweden (Dnr 214-12, T422-12, T516-15, T233-16, T300-17, T1144-17, T121-18, T1071-18, T2019 02347). In Denmark and Finland, study-specific ethical approval is not required when using national registry data for research purposes.

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Sandvei, M.S., Pinborg, A., Gissler, M. et al. Risk of ovarian cancer in women who give birth after assisted reproductive technology (ART)—a registry-based Nordic cohort study with follow-up from first pregnancy. Br J Cancer 128, 825–832 (2023). https://doi.org/10.1038/s41416-022-02097-7

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