Contact: Sue McGreevey
Massachusetts General Hospital
Caption: Top image: Before treatment with the angiotensin inhibitor losartan, stresses within a tumor caused by the buildup of collagen (blue) compress blood vessels and restrict blood flow (green). Bottom image: After losartan treatment, blood vessels open up, restoring the blood flow required for effective chemotherapy.
Credit: Vikash Chauhan, Ph.D., Steele Lab for Tumor Biology, Massachusetts General Hospital
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