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Published in: BMC Cancer 1/2024

Open Access 01-12-2024 | Lung Cancer | Research

Reproductive factors and risk of lung cancer among 300,000 Chinese female never-smokers: evidence from the China Kadoorie Biobank study

Authors: Marwa M. A. Elbasheer, Bastian Bohrmann, Yiping Chen, Jun Lv, Dianjianyi Sun, Xia Wu, Xiaoming Yang, Daniel Avery, Liming Li, Zhengming Chen, Christiana Kartsonaki, Ka Hung Chan, Ling Yang

Published in: BMC Cancer | Issue 1/2024

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Abstract

Background

Lung cancer is the leading cause of cancer mortality among Chinese females despite the low smoking prevalence among this population. This study assessed the roles of reproductive factors in lung cancer development among Chinese female never-smokers.

Methods

The prospective China Kadoorie Biobank (CKB) recruited over 0.5 million Chinese adults (0.3 million females) from 10 geographical areas in China in 2004–2008 when information on socio-demographic/lifestyle/environmental factors, physical measurements, medical history, and reproductive history collected through interviewer-administered questionnaires. Cox proportional hazard regression was used to estimate adjusted hazard ratios (HRs) of lung cancer by reproductive factors. Subgroup analyses by menopausal status, birth year, and geographical region were performed.

Results

During a median follow-up of 11 years, 2,284 incident lung cancers occurred among 282,558 female never-smokers. Ever oral contraceptive use was associated with a higher risk of lung cancer (HR = 1.16, 95% CI: 1.02–1.33) with a significant increasing trend associated with longer duration of use (p-trend = 0.03). Longer average breastfeeding duration per child was associated with a decreased risk (0.86, 0.78–0.95) for > 12 months compared with those who breastfed for 7–12 months. No statistically significant association was detected between other reproductive factors and lung cancer risk.

Conclusion

Oral contraceptive use was associated with an increased risk of lung cancer in Chinese female never-smokers. Further studies are needed to assess lung cancer risk related to different types of oral contraceptives in similar populations.
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Metadata
Title
Reproductive factors and risk of lung cancer among 300,000 Chinese female never-smokers: evidence from the China Kadoorie Biobank study
Authors
Marwa M. A. Elbasheer
Bastian Bohrmann
Yiping Chen
Jun Lv
Dianjianyi Sun
Xia Wu
Xiaoming Yang
Daniel Avery
Liming Li
Zhengming Chen
Christiana Kartsonaki
Ka Hung Chan
Ling Yang
Publication date
01-12-2024
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2024
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-024-12133-9

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