Table 1.

The gross and histological characteristics of studied renal cell carcinomas (RCC); clear cell RCC (ccRCC), papillary RCC (pRCC) and chromophobe RCC (chRCC).

	ccRCC n=14	pRCC n=13	chRCC n=12	P
Tumor size (cm)	7 ± 3.8	5 ± 3	4 ± 2.3	0.124‡
Primary tumor (pT)†
pT1a pT1b pT2a pT2b pT3a	4 3 0 1 6	5 3 2 0 3	8 3 0 0 1	0.194*
Sarcomatoid Features	2	1	1	0.824*
Tumor necrosis	3	8	1	0.026*
Lymphovacular Invasion	2	2	0	0.948*

^‡Kruskal-Wallis test with Dunn’s post-hoc test; *Chi-squared test; ^†pT1a Tumor less than or equal to 4 cm in greatest dimension, limited to the kidney; pT1b Tumor greater than 4 cm but less than or equal to 7 cm in greatest dimension limited to the kidney; pT2a Tumor greater than 7 cm but less than or equal to 10 cm in greatest dimension, limited to the kidney; pT2b Tumor greater than 10 cm, limited to the kidney; pT3a Tumor extends into the renal vein or its segmental branches, or invades the pelvicalyceal system, or invades perirenal and/or renal sinus fat but not beyond Gerota’s fascia.