Table 2. Relationship between SIRT1 expression and the clinicopathological features of 34 patients with pelvis chondrosarcoma.

Parameters	Category	Total no. of patients	SIRT1 positive (n = 25)	SIRT1 negative (n = 9)	P
Age (years)	>40	19	13 (52.0)	6 (66.7)	0.360
	≤40	15	12 (48.0)	3 (33.3)
Gender	Male	19	14 (56.0)	5 (55.6)	0.640
	Female	15	11 (44.0)	4 (44.4)
Size of tumor (cm)*	≥10	22	20 (80.0)	2 (22.2)	0.004
	<10	12	5 (20.0)	7 (77.8)
Recurrence*	Positive	17	16(64.0)	1 (11.1)	0.008
	Negative	17	9 (36.0)	8 (88.9)
Metastasis*	Positive	19	17 (68.0)	2 (22.2)	0.023
	Negative	15	8 (32.0)	7 (77.8)
Grade*	I	15	7 (28.0)	8 (88.9)	0.002
	II + III	19	18 (72.0)	1 (11.1)