Researchers zero in on cancer-tissue boundary

U.S. scientists say they found that tumor cells bordering normal tissue receive signals telling them to leave the tumor and start traveling to form deadly metastatic tumors in other parts of the body. Studying fruit fly tumors, the study's main author says the team found that nearly all tumor cells at a border die, but said if one of the traveling cells undergoes a mutation that prevents cell death, it could establish a metastatic tumor.

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