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Adverse birth outcomes of adolescent and young adult women diagnosed with cancer during pregnancy

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OXFORD UNIV PRESS INC
DOI: 10.1093/jnci/djad044

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This study examined adverse birth outcomes among adolescent and young adult women diagnosed with cancer during pregnancy. The results showed that cancer diagnosis was significantly associated with adverse birth outcomes such as low birth weight and preterm birth in this population.
Background We examined adverse birth outcomes among adolescent and young adult women diagnosed with cancer (AYA women, ages 15-39years) during pregnancy. Methods We linked data from the Texas Cancer Registry, vital records, and Texas Birth Defects Registry to identify all singleton births to AYA women diagnosed during pregnancy from January 1999 to December 2016. We compared prevalence of adverse live birth outcomes between AYA women and women without cancer (matched 1:4 on age, race and ethnicity, and year). Among AYA women, we used log-binomial regression to identify factors associated with these outcomes. Statistical tests were 2-sided. Results AYA women had 1271 singleton live births and 20 stillbirths. AYA women (n=1291) were 33.3% Hispanic and 9.8% non-Hispanic Black and most commonly had breast (22.5%), thyroid (19.8%), and gynecologic (13.3%) cancers. Among live births, AYA women had a higher prevalence of low birth weight offspring (30.1% vs 9.0%), very preterm (5.7% vs 1.2%), and preterm birth (25.1% vs 7.2%); cesarean delivery (44.3% vs 35.2%); and low Apgar score (2.7% vs 1.5%), compared with women without cancer (n=5084) (all P<.05). Prevalence of any birth defect by age 12months did not statistically differ (5.2% vs 4.7%; P=.48), but live births to AYA women more often had heart and circulatory system defects (2.2% vs 1.3%; P=.01). In adjusted models, cancer type and chemotherapy were associated with adverse live birth outcomes. Conclusions AYA women diagnosed during pregnancy have higher prevalence of adverse birth outcomes and face difficult decisions in balancing treatment risks and benefits.

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