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Chemotherapy is a very aggressive treatment both kills healthy cells as the cancer.
A study has been taking peace to all people who fight against cancer. When the treatment kills healthy cells that are "around" the tumor, a substance called WNT16B is released (the protein that can feed the tumor).
This explains when a person responds well to treatment, but after some time worsens. In reaching this conclusion, prostate tumors studied and already are with analyzes referred with breast cancer and ovarian cancer.
Now they can try to improve the treatment, which may be much safer and more efficient.