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Interleukin-11 (IL-11) and the IL-11 receptor (IL-11R) have been reported for the relationship of tumor progression and may play a significant role in bone metastases.Gallium-68(68Ga) is suitable for labeling for small molecule peptides.0bjective In this study, we radiolabeled c(CGRRAGGSC) with 68Ga to monitoring the IL-11 receptor expression.The nonapeptide structure c(CGRRAGGSC) is a phage-display-selected IL-11 mimic binding to IL-11R.