Persistent Effect of Redlining on Survival from Screenable Cancers in Washington State, 2000-2018.

Abstract

This study examined the extent to which the 1930s Home Owners' Loan Corporation (HOLC) redlining grades are associated with contemporary survival from screenable cancers among residents of three largest cities in Washington State. Redling assigned a mortgage security metric to neighborhoods. We used 2000-2018 data from the Washington State Cancer Registry to examine differences in survival from all-cause and cancer-specific mortality for breast (n = 14,725), cervical (n = 656), colorectal (n = 7,089), and lung (n = 8,365). Survival was examined in HOLC areas graded as A (best); B (still desirable); C (declining); and D (redlined) using Kaplan-Meier and Cox proportional hazards regression techniques. Among patients with breast cancer, the hazard ratio for all-cause mortality was highest for areas graded D followed by C and B. For colorectal and lung cancer, the hazard ratio for all-cause mortality was highest for areas graded C followed by D and B. The estimated marginal slopes for the log hazard of mortality decreased over time in HOLC areas graded A, B, and C for breast and lung cancers, and in areas graded D for colorectal and lung cancers. HOLC grade was not associated with survival among cervical cancer patients. These findings call for efforts to reduce screenable - but often unrecognized - health inequalities associated with residential location.