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  "path": "/news/2026-04-tumors-immune-cells-personality-side.html",
  "publishedAt": "2026-04-21T14:20:04.000Z",
  "site": "https://medicalxpress.com",
  "textContent": "Macrophages, key regulators of tissue health and immune defense, are among the most abundant immune cells in solid tumors. Their role in cancer has been difficult to define because even closely related macrophage populations can have very different, and sometimes opposing, functions.",
  "title": "Inside tumors, immune cells hide a split personality—and one side could quietly decide cancer's fate"
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