(a).

Characteristics	Case number	%
Total cases	121	100%
Gender
Male	67	54.9
Female	55	45.1
Tumor location (lobe)
Left outer	64	52.5
Left inner	1	0.8
Right anterior	48	39.3
Right posterior	8	6.6
Caudate	8	6.6
Tumor number
1	92	75.4
2	3	2.5
≥3	22	18.0
Vascular invasion
No	78	63.9
Yes	44	36.1
Pathological differentiation
Low	1	0.8
Medium	18	14.8
High	5	4.1
Lymphatic metastasis
No	76	62.3
Yes	46	37.7
Distant metastasis
No	109	89.3
Yes	13	10.7