Table 6.

Reference genes ranked in order of increasing expression stability in the current study and the study of Kim et al. [35].

	Current study*		Study of Kim et al.
Rank	Genes	M value	Genes	M value
6	B2M	0.799	B2M	2.60
5	HPRT1	0.658	RPL13A	2.50
4	UBC	0.654	GAPDH	2.43
3	SDHA	0.598	HPRT1	2.26
2	GAPDH	0.566	HMBS	2.18
1	HMBS	0.514	UBC	2.17
	HMBS-GAPDH	0.417	UBC-HMBS	1.02

* Data shown are from the sample panel of combined tumoral and non-tumoral tissues