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In page Champions Oncology:

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Champions TumorGrafts maintain the microenvironment surrounding the tumor and have been shown to have high correlation to the patient’s tumor. Due to this close resemblance to the human tumor, TumorGrafts are highly predictive of treatment outcomes in patients. Studies have shown the mouse avatars predict clinical benefit in 80% of patients.[1][2] Approximately 450 TumorGrafts have been established as of April 2014.[3][citation needed]