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Treatment outcomes of ureteral stenting for malignant extrinsic ureteral obstruction: a comparison between polymeric and metallic stents

Authors Asakawa J, Iguchi T, Tamada S, Ninomiya N, Kato M, Yamasaki T, Nakatani T

Received 25 April 2018

Accepted for publication 1 June 2018

Published 28 August 2018 Volume 2018:10 Pages 2977—2982


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Kenan Onel

Jumpei Asakawa, Taro Iguchi, Satoshi Tamada, Noriko Ninomiya, Minoru Kato, Takeshi Yamasaki, Tatsuya Nakatani

Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan

Purpose: To compare treatment outcomes, more specifically patency rate, of polymeric and metallic stents for malignant ureteral obstruction.
Patients and methods: Between August 2007 and September 2017, we retrospectively analyzed the data of 92 patients (126 ureters) having a diagnosis of malignant extrinsic ureteral obstruction treated with indwelling ureteral stents (polymeric and full-length metallic stents). Of these patients, 35 (54 ureters) were treated with polymeric stents and 57 (72 ureters) with a Resonance® metallic stent. The observation period was censored to 1 year. Survival rate in cases of malignant ureteral obstruction was calculated, and the relationship between the causes of ureteral obstruction, the stent type, and the patency rate was evaluated.
Results: The median observation period was 145 days, with a median survival time of 258 days. The stent patency rate was 70.9% at 1 year, regardless of stent type. Stent occlusion was observed in 20 patients (33 ureters). According to stent type, occlusion of the polymeric and metallic stents was identified in 12 (22%) and 8 (11%) cases, respectively. The clinical features associated with stent failure were assessed. In univariate analysis, the patency rate was significantly better for the metallic stent than for the polymeric stent (1-year patency rate; 78.4%, 61.1%, respectively, HR, 2.15; 95% CI, 1.07–4.33; p=0.031). However, the patency rate among patients with abdominal dissemination, lymph node metastasis, and direct compression by tumor was not significantly different.
Conclusion: Indwelling ureteral stents, particularly metallic stents, are effective for the treatment of malignant ureteral obstruction.

Keywords: metallic stent, malignant ureteral obstruction, polymeric stent

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