Fig. 2From: Indications for extrahepatic bile duct resection due to perineural invasion in patients with gallbladder cancerKaplan–Meier curves for a overall survival rates and b disease-free survival rates. ***p < 0.005 compared with PNI (−) group using the log-rank test. ****p < 0.001 compared with PNI (−) group using the log-rank test. PNI perineural invasionBack to article page