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- May 6, 2026

Blood test reveals nine tumor cell ‘neighborhoods’ tied to immunotherapy outcomes

A simple blood test can reveal the geographic relationships among healthy cells surrounding a cancerous tumor, researchers at Stanford Medicine and the Mayo Clinic have found. The test is the first noninvasive way to study what’s called the tumor microenvironment, which plays a critical role in determining how different patients—even those with similar tumors—fare after diagnosis and treatment.

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