Table 3. Comparison of microRNA expression among renal cell tumour subtypes in fresh-frozen tissues.

	P-valuea, M–W test
	miR-21	miR-141	miR-155	miR-183	miR-200b
Oncotytoma vs ccRCC	<0.001	NS	<0.001	<0.001	<0.001
Oncocytoma vs pRCC	<0.001	NS	0.012	<0.001	<0.001
Oncotytoma vs chRCC	NS	0.001	NS	NS	0.001
pRCC vs ccRCC	NS	NS	0.003	NS	NS
ccRCC vs chRCC	<0.001	0.002	<0.001	<0.001	NS
pRCC vs chRCC	<0.001	<0.001	0.002	NS	NS

Abbreviations: ccRCC=clear-cell renal cell carcinoma; chRCC=chromophobe RCC; M–W=Mann–Whitney test; NS=not significant; pRCC=papillary RCC.

^aStatistically significant when P<0.0125, Bonferroni's correction.