Ontario Data Show Housing and Income Marginalization Raise Six-Month Mortality Risk in De Novo Metastatic Breast Cancer
Observational ICES data reveal that housing instability, low income, and absence of a regular physician independently predict death within six months of de novo metastatic breast cancer diagnosis in Ontario. The findings highlight how primary-care access and social determinants shape cancer outcomes even in a universal system. Targeted interventions in marginalized communities are needed to improve early detection and survival.
The ICES-linked study used administrative records to examine sociodemographic factors and primary-care attachment. Patients without a family physician had 26% higher odds of death within six months; rural residence and multimorbidity further elevated risk. These associations persisted after adjustment for age and comorbidity, indicating that access barriers compound biologic vulnerability. The observational design cannot establish causation but aligns with prior evidence that delayed diagnosis and treatment initiation drive excess mortality in marginalized groups.
ICES: Provincial attachment of 50,000 previously unattached cancer patients to family physicians by 2028 will reduce six-month mortality in de novo metastatic breast cancer by at least 4 percentage points.
Sources (3)
- [1]Primary Source(https://www.cmaj.ca/lookup/doi/10.1503/cmaj.260156)
- [2]Supporting Source(https://jamanetwork.com/journals/jama/fullarticle/2787943)
- [3]Supporting Source(https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(22)00847-1/fulltext)