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A four year study which examined 227 patient demonstrated no evidence of tumor growth in patients who had mesenchymal stem cells injected for orthopedic applications. Prior to injection, the mesenchymal stem cells has been expanded for a limited time. This differentiates them from those cells used in BMAC (bone marrow aspirate concentrates). The findings are consistent with other reports which found no evidence of tumor growth. What is unique about the current study is the time frame ( 4 years) and number of patients. Congrats to Dr. Centeno and other team members 🙂