Overview
- The analysis, which was published Monday, June 22, 2026, linked California birth records (1982–2021) to cancer registry diagnoses (1988–2021) and compared 1,221 early-onset colorectal cancer cases with 61,050 matched controls.
- After adjustment, males had about 34% higher odds of early-onset colorectal cancer than females and Hispanic individuals had about 43% higher odds than non-Hispanic White individuals.
- Among women, each 500 g increase in birthweight raised risk by roughly 10% and having a father older than 35 was associated with about a 56% higher risk.
- Having a foreign-born mother was associated with a lower overall risk, especially in males, and authors suggest diet, acculturation, and prenatal health as possible explanations.
- The study raises etiologic hypotheses but has limits—small pediatric subgroups, about 70% missing parental-education data, and possible unmeasured confounding—so authors call for follow-up research before changing clinical screening or care.