According to this 12 year study of 154,000 ADULTS.

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In other words: chemotherapy kills an average 97% of cancer patients within 5 years.
Here’s a source that explains the research and gives more of a perspective of what was looked at for this particular study (and what was left out of that study): Read here: www.ncbi.nlm.nih.gov/pubmed/15630849 NOTE: The study focuses on the contribution of chemotherapy to survival and -not- about survival of patients having chemotherapy.