Association between caesarean birth and childhood cancer: An age-lagged approach

Area of Science:

• Pediatric Oncology
• Epidemiology
• Reproductive Health

Background:

• Caesarean delivery rates have increased globally.
• Understanding the long-term health implications of birth mode is crucial for public health.
• Previous studies have suggested potential links between birth interventions and childhood diseases.

Purpose of the Study:

• To investigate the association between caesarean birth and the risk of childhood cancer.
• To examine age-specific risks of various cancer types in relation to mode of delivery.
• To explore potential underlying mechanisms for observed associations.

Main Methods:

• A large cohort study of over one million children in Quebec, Canada (2006-2020).
• Follow-up from birth to age 14 years, analyzing modes of delivery (caesarean, operative vaginal, spontaneous vaginal).
• Statistical analysis using hazard ratios (HR) and 95% confidence intervals (CI) with age-lagged analyses, adjusted for confounders.

Main Results:

• Caesarean birth was associated with a 1.16 times higher risk of any childhood cancer compared to spontaneous vaginal birth.
• A significant association was found with solid tumors (HR 1.21) and a trend towards increased risk for hematopoietic cancers.
• The association was stronger at 2 years of age and most pronounced for lymphoma and sarcoma; operative vaginal birth showed no significant association.

Conclusions:

• Caesarean birth may be associated with an increased risk of specific childhood cancers, including lymphoma and sarcoma, particularly in early childhood.
• The biological mechanisms, such as mucosal dysbiosis or differences in labor hormone exposure, require further investigation.
• These findings highlight the importance of considering birth mode in pediatric cancer research and prevention strategies.