Hemangiopericytoma: Incidence, Treatment, and Prognosis Analysis Based on SEER Database

Table 2

TNM and SEER stages in the hemangiopericytoma patient cohort.

Hemangiopericytoma (AJCC stage 7th edition)
	Number	Percent (%)		Number	Percent (%)
T stage			SEER stage
T1	35	20.6	Localized	442	37.8
T2	120	70.6	Regional	197	16.9
Unknown	15	8.8	Distant	115	9.8
N stage			Unstaged	415	34.7
N0	165	90.2	Grade
N1	2	1.1	I	142	14.9
Unknown	16	8.7	II	37	3.9
M stage			III	86	9.0
M0	164	89.6	IV	136	14.3
M1	19	10.4	Unknown	552	57.9
AJCC stage
I	95	55.2
II	17	9.9
III	34	19.8
IV	19	11.0
Unknown	7	4.1

TNM: tumor-node-metastasis; SEER: Surveillance, Epidemiology, and End Results; AJCC: American Joint Committee on Cancer.