Recent studies demonstrate that social determinants and biological markers heavily influence early-onset colorectal cancer outcomes as cases rise in adults under 50. Research presented at the AACR Conference reveals that younger patients in highly disadvantaged neighborhoods face a 30% higher risk of cancer death, driven mainly by socioeconomic and housing barriers. Meanwhile, Medicaid expansion is linked to a 6.3% overall mortality drop, and routine blood tests tracking biological aging show promise in identifying high-risk younger adults.
Neighborhood disadvantage and colorectal cancer mortality
- ▪A University of Kentucky College of Medicine study presented at the AACR Conference found early-onset colorectal cancer patients in disadvantaged Kentucky and Georgia neighborhoods faced a 30% increased risk of five-year colorectal cancer death, nearly double average-onset's 16%.
- ▪Among Social Vulnerability Index domains, disadvantaged socioeconomic status was associated with a 21% increased risk of five-year colorectal cancer death in early-onset patients and 13% in average-onset patients.
- ▪Disadvantaged housing and transportation conditions were associated with a 17% increased risk of five-year colorectal cancer death in early-onset patients and 7% in average-onset patients.
Early-onset mortality in Kentucky and Georgia
- ▪A previous study by researcher Justin Xavier Moore's team identified specific counties in Kentucky and Georgia as hot spots for early-onset colorectal cancer mortality.
- ▪Overall five-year colorectal cancer mortality rates among patients in Kentucky and Georgia were 27% lower for early-onset patients than for average-onset colorectal cancer patients.
Impact of social disadvantage
- ▪Colorectal cancer patients from socially disadvantaged areas in Kentucky and Georgia were 4% less likely to initiate treatment within 30 days of diagnosis than those from advantaged areas.
- ▪In the Kentucky and Georgia study, living in socioeconomically disadvantaged neighborhoods was associated with a 14% increased risk of five-year mortality across all colorectal cancer patients.
Kentucky and Georgia colorectal cancer study
- ▪The University of Kentucky and Augusta University study analyzed 2011–2022 registry data from 68,789 colorectal cancer patients in Kentucky and Georgia, finding 13.6% had early-onset disease.
- ▪Early-onset colorectal cancer patients in Kentucky and Georgia received their first treatment after a median of five days, compared to six days for average-onset patients.
Biological aging and early-onset colorectal cancer
- ▪Accelerated biological aging was associated with higher risk for colon adenocarcinoma, while showing no statistically significant association with rectal adenocarcinoma or neuroendocrine tumors.
- ▪In the Sungkyunkwan University cohort, each 1-unit increase in biological age acceleration based on nine routine blood markers was associated with a 7% higher risk of early-onset colorectal adenocarcinoma.
- ▪A Sungkyunkwan University study of 198,491 Korean adults under 50 published in Clinical Gastroenterology and Hepatology linked accelerated biological aging to a 93% higher risk for early-onset colorectal adenocarcinoma.
Medicaid expansion impact on colorectal cancer
- ▪Medicaid expansion was associated with an 11.6% relative reduction in mortality for stage IV colorectal cancer, compared to 5.4% for stage I, 3.2% for stage II, and 5.2% for stage III.
- ▪Medicaid expansion was associated with a 2.13 percentage point increase in early-stage colorectal cancer diagnosis, a 1.54 percentage point increase in surgery, and a 0.68 percentage point increase in any treatment.
- ▪A JAMA Network Open cohort study of 658,593 adults aged 40 to 64 found Medicaid expansion under the ACA was associated with a 6.3% relative reduction in overall colorectal cancer mortality.
- ▪Medicaid expansion was associated with a 22.6% relative reduction in colorectal cancer mortality among Hispanic patients, compared to 4.1% for non-Hispanic Black patients and 4.3% for White patients.
Trends in early-onset colorectal cancer
- ▪Both incidence and mortality rates of early-onset colorectal cancer, defined as cases in individuals under 50 years old, have been on the rise in recent years.
- ▪More than half of early-onset colorectal cancer cases are diagnosed before 45 years, which is the recommended age to begin standard screening.
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