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Treatment to stop the growth of malignant tumors may come from a protein in the tumors themselves, researchers have found. Scientists at the Children's Hospital discovered that angiostatin -- a protein produced by large, growing tumors -- inhibits the growth of tiny secondary tumors that spread through the bloodstream and often lodge in vital organs such as the lungs, liver and brain. While the study's authors caution that this isn't a cure for cancer, they're optimistic that the protein will someday be used to slow or stop the growth of cancerous tumors.