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Objective To investigate the effect of intrathecal injection with PKC inhibitor Staurosporine on pain behaviour and spinal microglia activation in rats with shin bone cancer pain.Methods One hundred and twenty adult male SD rats weighting 200-250g were randomly divided into 5 groups (n=24): group control (group C),group model (group M),group normal saline (group N),group solvent (group S) and group Staurosporine (group SP).