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TUESDAY, April 14 (HealthDay News) -- A particular type of stem cell transplantation using the patient's own cells led to short-term freedom from insulin injections in 20 of 23 patients newly diagnosed with type 1 diabetes participating in an experimental protocol in Brazil. One patient even managed to go four years without needing outside sources of insulin, although the average was 31 months, said the authors of a report in the April 15 issue of the Journal of the American Medical Association, a themed issue on diabetes. The patients also kept their blood sugar under control, which is key to preventing complications from diabetes. And, the authors stated, increased C-peptide levels indicated that the pancreas' beta cells were alive and well.