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Maternal age, history of miscarriage, and embryonic/fetal size are associated with cytogenetic results of spontaneous early miscarriages

  • Genetics
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Abstract

Purpose

To clarify the associations of the maternal age, history of miscarriage, and embryonic/fetal size at miscarriage with the frequencies and profiles of cytogenetic abnormalities detected in spontaneous early miscarriages.

Methods

Miscarriages before 12 weeks of gestation, whose karyotypes were evaluated by G-banding between May 1, 2005, and May 31, 2017, were included in this study. The relationships between their karyotypes and clinical findings were assessed using trend or chi-square/Fisher’s exact tests and multivariate logistic analyses.

Results

Three hundred of 364 miscarriage specimens (82.4%) had abnormal karyotypes. An older maternal age was significantly associated with the frequency of abnormal karyotype (ptrend < 0.001), particularly autosomal non-viable and viable trisomies (ptrend 0.001 and 0.025, respectively). Women with ≥ 2 previous miscarriages had a significantly lower possibility of miscarriages with abnormal karyotype than women with < 2 previous miscarriages (adjusted odds ratio [aOR], 0.48; 95% confidence interval [95% CI], 0.27–0.85). Although viable trisomy was observed more frequently in proportion to the increase in embryonic/fetal size at miscarriage (ptrend < 0.001), non-viable trisomy was observed more frequently in miscarriages with an embryonic/fetal size < 10 mm (aOR, 2.41; 95% CI, 1.27–4.58), but less frequently in miscarriages with an embryonic/fetal size ≥ 20 mm (aOR, 0.01; 95% CI, 0.00–0.07) than in anembryonic miscarriages.

Conclusions

The maternal age, history of miscarriage, and embryonic/fetal size at miscarriage may be independently associated with the frequencies or profiles of cytogenetic abnormalities in early miscarriages.

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Acknowledgements

We wish to thank Brian Quinn, editor-in-chief, Japan Medical Communication, for editing this manuscript.

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Correspondence to Nobuaki Ozawa.

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This study was approved by the institutional ethical committee to publicize the clinical findings of women and cytogenetic results of their miscarriages, in August 2015 (No. 991).

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The authors declare that they have no conflicts of interest.

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Ozawa, N., Ogawa, K., Sasaki, A. et al. Maternal age, history of miscarriage, and embryonic/fetal size are associated with cytogenetic results of spontaneous early miscarriages. J Assist Reprod Genet 36, 749–757 (2019). https://doi.org/10.1007/s10815-019-01415-y

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  • DOI: https://doi.org/10.1007/s10815-019-01415-y

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