Table 2.

Invasion of the portal vein confirmed by histology

Study	Positive for invasion, n (%)	Portal vein resection, n
Song et al. 200925	28 (54%)	51
Ebata et al. 20038	36 (69%)	52
Nagino et al. 201019	44 (80%)	50
Muñoz et al. 20027	5 (50%)	10
Hemming 201120	17 (40%)	42
Neuhaus et al. 19996	5 (22%)	23
Miyazaki et al. 200727	38 (88%)	44