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  "path": "/news/2026-02-breast-cancers-evade-treatment-protein.html",
  "publishedAt": "2026-02-06T08:51:53.000Z",
  "site": "https://medicalxpress.com",
  "tags": [
    "Oncology & Cancer"
  ],
  "textContent": "Up to 20% of hormone receptor-positive breast cancers don't respond to antiestrogen therapies. A study led by researchers at UT Southwestern, published in the Journal of Clinical Investigation, suggests that a protein secreted by immune cells within these tumors causes them to grow even in the absence of estrogen.",
  "title": "Why some breast cancers evade treatment: Protein secreted by T cells may explain resistant tumors"
}