You *can* cut off cancer cells and thousands of people undergo successful surgery without their cancer ever returning. However it’s tricky. Many times you can cut off the original cancer and yet a new cancer can grow somewhere else. Also you could cut off 99.9% of the cancer and leave a few cells behind, which then grow back into new cancer. Lastly, sometimes cancer tissue looks like normal tissue and it might be hard for the surgeon to differentiate the two.
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