Nanoparticle smart bombs designed to carry an anti-cancer drug called doxorubicin hampered the spread of pancreatic and kidney cancer in mice by targeting integrin ανβ3 -- a protein found on the surface of some tumor blood vessels -- without destroying nearby tissues, a U.S. study found. "This new drug-delivery system offers an important advance in treating metastatic disease," the study's lead researcher said.

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