Table 3. Association among Masaoka stage, surgical methods and completeness of resection.

Subgroups	Masaoka stage				P value	Completeness of resection					P value
	I	II	II	IV		Biopsy	Biopsy + 125I	Thymoma resection	Thymectomy	Extended thymectomy
Surgical methods					0.004						0.396
Open surgery (n=66)	15	14	22	15		6	4	33	3	20
Thoracoscopic surgery (n=70)	33	18	13	6		9	3	33	9	16
Completeness of resection					<0.001
Biopsy	0	0	4	11
Biopsy + 125I	0	0	4	3
Thymoma resection	29	14	18	5
Thymectomy	6	3	3	0
Extended thymectomy	13	15	6	2