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. 2021 Dec 2;11(12):e054156.
doi: 10.1136/bmjopen-2021-054156.

Urinary 8-hydroxy-2'-deoxyguanosine levels and small-for-gestational age infants: a prospective cohort study from the Japan Environment and Children's Study

Tsuyoshi Murata  1   2 , Hyo Kyozuka  3   2 , Toma Fukuda  3   2 , Yuta Endo  3   2 , Aya Kanno  3   2 , Shun Yasuda  3   2 , Akiko Yamaguchi  3   2 , Akiko Sato  3 , Yuka Ogata  3 , Kosei Shinoki  3 , Mitsuaki Hosoya  3   4 , Seiji Yasumura  3   5 , Koichi Hashimoto  3   4 , Hidekazu Nishigori  3   6 , Keiya Fujimori  3   2 ; Japan Environment and Children’s Study (JECS) Group
Affiliations

Urinary 8-hydroxy-2'-deoxyguanosine levels and small-for-gestational age infants: a prospective cohort study from the Japan Environment and Children's Study

Tsuyoshi Murata et al. BMJ Open. .

Abstract

Objectives: To evaluate the association between the urinary 8-hydroxy-2'-deoxyguanosine (U8-OHdG) levels and the incidence of small-for-gestational age (SGA) infants and to assess the utility of U8-OHdG as a biomarker to predict the incidence of SGA infants.

Design: Prospective cohort study.

Setting: The Japan Environment and Children's Study.

Participants: Data of participants enrolled in the Japan Environment and Children's Study, a nationwide birth cohort study, between 2011 and 2014 were analysed; 104 062 fetal records were analysed. Data of women with singleton pregnancies ≥22 weeks of gestation were analysed.

Primary and secondary outcome measures: U8-OHdG levels were assessed using liquid chromatography-tandem mass spectrometry. Participants were categorised into the following three groups according to the quartile of the distribution of U8-OHdG: low U8-OHdG (<1.95 ng/mgCre), moderate U8-OHdG (the combined second and third quartiles; 1.95-2.95 ng/mgCre) and high U8-OHdG (>2.95 ng/mgCre) groups. Additionally, participants in the 90th percentile for U8-OHdG levels were analysed. Odds ratios (ORs) for SGA infants (<-1.5 and <-2.0 SD) were calculated using a logistic regression model while adjusting for confounding factors; the moderate U8-OHdG group was used as a reference. The cut-off value of U8-OHdG to predict the incidence of SGA infants was calculated using a receiver operating characteristic (ROC) curve analysis.

Results: Data of 80 212 participants were analysed. The adjusted ORs for SGA infants (<-1.5 and<-2.0 SD) in the high U8-OHdG group were 1.16 (95% CI 1.07 to 1.25) and 1.22 (95% CI 1.07 to 1.38). The cut-off value of U8-OHdG (3.26 ng/mgCre) showed a poor ability to predict SGA infants (sensitivity, 21.9%; specificity, 83.6%; area under the ROC curve, 0.530).

Conclusions: Elevated U8-OHdG levels were associated with an increased incidence of SGA infants. However, this parameter would not be a useful screening tool for predicting SGA infants owing to its low sensitivity and specificity.

Keywords: epidemiology; fetal medicine; maternal medicine; prenatal diagnosis.

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Conflict of interest statement

Competing interests: None declared.

Figures

Figure 1
Figure 1
Flowchart showing the enrolment of participants in the study. BMI, body mass index; U8-OHdG, urinary 8-hydroxy-2'-deoxyguanosine.
See this image and copyright information in PMC

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