
Older age, lower educational level in the area of residence, community-setting treatment, and treatment at East South Central facilities are associated with lower rates of microsatellite instability (MSI) and KRAS biomarker testing in patients with metastatic colorectal cancer.


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Several socioeconomic and demographic factors, including older age and treatment location, affected the likelihood that patients with metastatic CRC received biomarker testing.

Factors Linked to Disparities in CRC Biomarker Testing

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Sociodemographic Disparities in Colorectal Cancer Biomarker Testing Rates Across the United States
