PNCK and nonpapillary renal cell carcinoma: Intense expression of PNCK in ccRCC samples was correlated with Fuhrman grade (p = 0.011), tumor size (p<0.001), T stage (p<0.001) and N classification (p = 0.015), but it was not correlated with gender (p = 0.164), age (p = 0.229), metastasis (p = 0.115) and recurrence (p = 0.985).