PPIB and renal cell carcinoma: Interestingly, the IC50 of AJ and AJ-HP-β-CD in primary cc RCC 786-O cells (16.01 ± 1.54, 3.51 ± 0.79) was less than 50% of that of metastatic papillary RCC ACHN (35.96 ± 1.08, 9.82 ± 1.02), indicating that AJ and AJ-HP-β-CD had higher cytotoxic activity on primary cc RCC.