Reproductive Factors and Risk of Lung Cancer Among 300,000 Chinese Female Never-smokers: Evidence from the China Kadoorie Biobank Study

Overview

Journal BMC Cancer

Publisher Biomed Central

Specialty Oncology

Date 2024 Mar 27

PMID 38532314

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

Affiliations

Soon will be listed here.

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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