Growth Signal Can Influence Cancer Cells' Vulnerability to Drugs, Study Suggests

In theory, a tumor is an army of clones, made up of many copies of the original cancerous cell. But tumor cells don't always act like duplicates, and their unpredictable behavior can create problems for treatment. For while some cells within a tumor succumb to anti-cancer drugs, others may survive to bring the cancer back to life once therapy has ended.

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