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Downregulation of miR‐21 inhibits glioblastoma xenograft growth. (A) When subcutaneous tumors were established, As‐miR‐21 was injected in a multisite injection manner. Tumor volumes were measured every 3 days during treatment. (B) The expression levels of STAT3 and human telomerase reverse transcriptase were tested by immunohistochemistry analyses of xenograft tumors after As‐miR‐21 treatment. *P < 0.05 as compared with the control group.
