Do longer formula feeding and later introduction of solids increase risk for pediatric acute lymphoblastic leukemia?

Area of Science:

• Pediatric Oncology
• Epidemiology
• Nutritional Science

Background:

• Milk formula feeding may increase insulin-like growth factor-1, potentially influencing leukemogenesis.
• Infant feeding practices and the timing of solid food introduction are critical factors in early development.

Purpose of the Study:

• To investigate the association between infant feeding practices, age at introduction of solids, and the risk of childhood acute lymphoblastic leukemia (ALL).

Main Methods:

• A case-control study involving 142 incident cases of childhood ALL (aged ≤14 years) and 284 controls.
• Frequency matching of cases and controls on age, sex, race, and ethnicity.
• Multivariable logistic regression analysis to assess the odds ratio (OR) of ALL based on feeding practices.

Main Results:

• Each additional month of formula feeding was associated with an increased OR of 1.17 (95% CI: 1.09-1.25) for ALL.
• Each additional month in the age at introduction of solids was associated with an increased OR of 1.18 (95% CI: 1.07-1.30) for ALL.
• Both longer formula feeding duration and later introduction of solids were independently linked to a higher risk of childhood ALL.

Conclusions:

• Prolonged milk formula feeding and delayed introduction of solid foods are associated with an elevated risk of pediatric acute lymphoblastic leukemia.
• These findings suggest a potential role for energy balance in early life in the development of pediatric ALL.
• Further investigation is warranted to explore factors influencing these feeding practices and their impact on leukemia risk.