No, but chemotherapy is quite useful in many situations. For cancers of the breast, colon, lung, and pancreas, chemotherapy is sometimes added to surgical therapy to improve the chances that a person will remain cancer free. This is called adjuvant therapy.
For some cancers of the white blood cells, called lymphoma, chemotherapy (sometimes with radiation therapy) is very effective at achieving complete remission. If a person with cancer achieves complete remission, lives a long life, and dies of old age, then we can say they were cured by their chemotherapy.
For more information, I recommend three excellent websites for the public: the American Cancer Society (www.cancer.org), the National Cancer Institute (www.cancer.gov), and the American Society for Clinical Oncology (www.cancer.net).
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