Figure 4From: Endoscopic stenting for hilar cholangiocarcinoma: efficacy of unilateral and bilateral placement of plastic and metal stents in a retrospective review of 480 patients Kaplan-Meier analysis showing that cumulative stent patency was significantly longer in patients treated with self-expandable metal stents (SEMS) than in patients palliated with plastic stents (PS) (p < 0.0001). Back to article page