Clinical Endoscopy

Systematic Review and Meta-analysis

Cryotherapy versus radiofrequency ablation in the treatment of dysplastic Barrett’s esophagus with or without early esophageal neoplasia: a systematic review and meta-analysis: Igor Logetto Caetité Gomes, Diogo Turiani Hourneaux de Moura, Igor Braga Ribeiro, Sérgio Barbosa Marques, Alexandre de Sousa Carlos, Beanie Conceição Medeiros Nunes, Bruno Salomão Hirsch, Guilherme Henrique Peixoto de Oliveira, Roberto Paolo Trasolini, Wanderley Marques Bernardo, Eduardo Guimarães Hourneaux de Moura; Clin Endosc 2024;57(2):181-190. Published online January 17, 2024; DOI: https://doi.org/10.5946/ce.2023.065

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Background
/Aims: Radiofrequency ablation (RFA) is the first-line therapy for dysplastic Barrett’s esophagus (BE). Therefore, cryotherapy has emerged as an alternative treatment option. This study aimed to compare the efficacies of these two techniques based on the rates of complete eradication of intestinal metaplasia (CE-IM) and dysplasia (CE-D). Adverse events and recurrence have also been reported.
Methods
An electronic search was conducted using the Medline (PubMed), Embase, LILACS, and Google Scholar databases until December 2022. Studies were included comparing cryotherapy and RFA for treating dysplastic BE with or without early esophageal neoplasia. This study was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.
Results
Three retrospective cohort studies involving 627 patients were included. Of these, 399 patients underwent RFA, and 228 were treated with cryotherapy. There was no difference in CE-IM (risk difference [RD], –0.03; 95% confidence interval [CI], –0.25 to 0.19; p=0.78; I2=86%) as well as in CE-D (RD, –0.03; 95% CI, –0.15 to 0.09; p=0.64; I2=70%) between the groups. The absolute number of adverse events was low, and there was no difference in the recurrence rate.
Conclusions
Cryotherapy and RFA were equally effective in treating dysplastic BE, with or without early esophageal neoplasia.

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Efficacy and Safety of Cryoablation in Barrett’s Esophagus and Comparison with Radiofrequency Ablation: A Meta-Analysis
Apostolis Papaefthymiou, Benjamin Norton, Andrea Telese, Daryl Ramai, Alberto Murino, Paraskevas Gkolfakis, John Vargo, Rehan J. Haidry
Cancers.2024; 16(17): 2937. CrossRef

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Review

Role of radiofrequency ablation in advanced malignant hilar biliary obstruction: Mamoru Takenaka, Tae Hoon Lee; Clin Endosc 2023;56(2):155-163. Published online January 16, 2023; DOI: https://doi.org/10.5946/ce.2022.218

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Malignant hilar biliary obstruction (MHO), an aggressive perihilar biliary obstruction caused by cholangiocarcinoma, gallbladder cancer, or other metastatic malignancies, has a poor prognosis. Surgical resection is the only curative treatment for biliary malignancies. However, the majority of patients with MHO cannot undergo surgery on presentation because of an advanced inoperable state or a poor performance state due to old age or comorbid diseases. Therefore, palliative biliary drainage is mandatory to improve symptomatic jaundice and the quality of life. Among the drainage methods, endoscopic biliary drainage is the current standard for palliation of unresectable advanced MHO. In addition, combined with endoscopic drainage, additional local ablation therapies, such as photodynamic therapy or radiofrequency ablation (RFA), have been introduced to prolong stent patency and survival. Currently, RFA is commonly used as palliative therapy, even for advanced MHO. This literature review summarizes recent studies on RFA for advanced MHO.

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Percutaneous endobiliary radiofrequency ablation with stent placement in type IV hilar cholangiocarcinoma: A prospective comparison with stent placement alone
Kun Yung Kim, Chang Jin Yoon, Jae Hwan Lee, Chong-Ho Lee, Jin-Hyeok Hwang, Jaihwan Kim
European Journal of Radiology.2024; 176: 111516. CrossRef
Metastatic Cholangiocarcinoma Presenting as Colonic Obstruction
Yianni Protopapadakis, Kevin Lamm, Joseph Baber
ACG Case Reports Journal.2023; 10(12): e01238. CrossRef
Is endoscopic radiofrequency ablation plus stent placement superior to stent placement alone for the treatment of malignant biliary obstruction? A systematic review and meta-analysis
Chenming Liu, Jiaming Dong, Yuxing Liu, Siyuan Zhang, Ruanchang Chen, Haijun Tang
Journal of International Medical Research.2023;[Epub] CrossRef

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Original Article

Survival Benefit of Intraductal Radiofrequency Ablation for Malignant Biliary Obstruction: A Systematic Review with Meta-Analysis: Byung Hyo Cha, Myoung-Jin Jang, Sang Hyub Lee; Clin Endosc 2021;54(1):100-106. Published online January 15, 2021; DOI: https://doi.org/10.5946/ce.2020.254

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Background
/Aims: Cholangiocarcinoma (CCA) is a rare but aggressive disease with a poor survival. Recent trials have shown improved survival with intraductal radiofrequency ablation (RFA) therapy. We performed a systematic review with meta-analysis to determine the survival benefit of endoscopic RFA for unresectable extrahepatic CCA with malignant biliary obstruction (MBO).
Methods
A systematic search from 1970 to 2020 was performed in MEDLINE, EMBASE, Cochrane Library, and ClinicalTrials. gov. We selected eligible studies reporting relative risks, hazard ratios (HRs), or odds ratios, adjusted by controlling for confounding factors of survival rate and stent patency duration, among patients with extrahepatic CCA with MBO treated with RFA with stent insertion or stent insertion only.
Results
A total of eight trials (three randomized and five nonrandomized) with a total of 420 patients were included in the metaanalysis. Pooled overall survival analysis favored RFA treatment with stent insertion (HR, 0.47; 95% confidence interval [CI], 0.34– 0.64; I²=47%; p=0.09); however, no significant difference was found in the duration of stent patency between the groups (HR, 0.79; 95% CI, 0.57–1.09; I²=7%; p=0.36).
Conclusions
RFA therapy with stent insertion may confer a survival benefit compared with stent insertion only in patients with CCA and MBO.

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Focused Review Series: Cutting Edge of Advanced Therapeutic Endoscopy

Management of Remnant or Recurrent Lesions after Endoscopic Papillectomy: Ichiro Yasuda, Saito Kobayashi, Kosuke Takahashi, Sohachi Nanjo, Hiroshi Mihara, Shinya Kajiura, Takayuki Ando, Kazuto Tajiri, Haruka Fujinami; Clin Endosc 2020;53(6):659-662. Published online December 3, 2019; DOI: https://doi.org/10.5946/ce.2019.171

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Endoscopic papillectomy (EP) for ampullary adenomas achieves cure rates ranging from 76% to 90%, and recurrence rates are as high as 33%. If remnant or recurrent lesions after prior EP are endoscopically visible and are not suspected of intraductal extension into the biliary or pancreatic duct, repeated snaring and cutting can be performed until all visible lesions are completely resected. However, endoscopic ablative therapies, particularly argon plasma coagulation, can be attempted for tiny or uncertain remnant and recurrent lesions. In addition, intraductal radiofrequency ablation has recently been attempted for residual intraductal lesions after EP at several institutions. Although still under investigation, it has shown some promise. It might be offered as an alternative to surgery, particularly in patients who are unfit for surgery or those who refuse to undergo surgery.

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Focused Review Series: Expanding Indication: Interventional Endoscopic Management for Pancreaticobiliary Diseases

Endoscopic Palliation for Biliary and Pancreatic Malignancies: Recent Advances: Zaheer Nabi, D. Nageshwar Reddy; Clin Endosc 2019;52(3):226-234. Published online January 22, 2019; DOI: https://doi.org/10.5946/ce.2019.003

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Malignancies of the pancreatobiliary system are usually unresectable at the time of diagnosis. As a consequence, a majority of these cases are candidates for palliative care. With advances in chemotherapeutic agents and multidisciplinary care, the survival rate in pancreatobiliary malignancies has improved. Therefore, there is a need to provide an effective and long-lasting palliative care for these patients. Endoscopic palliation is preferred to surgery as the former is associated with equal efficacy and reduced morbidity. The main role of endoscopic palliation in the vast majority of pancreatobiliary malignancies includes biliary and enteral stenting for malignant obstructive jaundice and gastric outlet obstruction, respectively. Recent advances in endoscopic palliation appear promising in imparting long-lasting relief of symptoms. Use of radiofrequency ablation and photodynamic therapy in malignant biliary obstruction has been shown to improve the survival rates as well as the patency of biliary stents. The emergence of endoscopic ultrasound (EUS) as a therapeutic tool has enhanced the capability of minimally invasive palliation in pancreatobiliary cancers. EUS is a valuable alternative to endoscopic retrograde cholangiopancreatography for the palliation of obstructive jaundice. More recently, EUS is emerging as an effective primary modality for biliary and gastric bypass.

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Focused Review Series: Endoscopic approaches to Neuroendocrine Tumors

Therapy of Pancreatic Neuroendocrine Tumors: Fine Needle Intervention including Ethanol and Radiofrequency Ablation: Sundeep Lakhtakia; Clin Endosc 2017;50(6):546-551. Published online November 30, 2017; DOI: https://doi.org/10.5946/ce.2017.167

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Pancreatic neuroendocrine tumors (PNETs) are increasingly being detected, though usually as incidental findings. Majority of the PNETs are non-functional and surgical resection is the standard of care for most of them. However, in patients with small PNETs localized within the pancreas, who are unfit or unwilling for surgery, alternate methods of treatment are needed. Direct methods of ablation of PNETs, using either ethanol injection or radiofrequency ablation (RFA), are emerging as effective methods. The limited literature available as case reports or case series on endoscopic ultrasound (EUS)-guided local ablation using either ethanol or RFA has demonstrated safety and efficacy along with short- to medium-term sustained relief. Long-term benefits with these local ablative therapies are awaited. Comparative studies are needed to show which of these two competing technologies is superior. Finally, comparative trials of EUS-guided ablation with surgical resection in terms of efficacy and safety will ensure their place in the management algorithm.

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Focused Review Series: Advanced Endoscopic Treatment for Pancreaticobiliary Diseases

Endoscopic Ablation Therapy for Biliopancreatic Malignancies: Jason Roque, Shiaw-Hooi Ho, Nageshwar Reddy, Khean-Lee Goh; Clin Endosc 2015;48(1):15-19. Published online January 31, 2015; DOI: https://doi.org/10.5946/ce.2015.48.1.15

Abstract PDF PubReader ePub

Biliopancreatic malignancies such as cholangiocarcinoma (CCA) has notoriously been diagnosed late. As such most therapy have been palliative in nature. Cholangioscopy allows for an earlier diagnosis to be made. Brachytherapy with the insertion of catheter with iridium-132 seeds, percutaneously or through endoscopic retrograde cholangiopancreatography (ERCP) was the earliest ablative techniques used. It has been shown to have a beneficial effect only in prolonging survival. Photodynamic therapy (PDT) has also been used for several years. stenting with PDT versus stenting alone for unresectable CCA showed a marked survival benefit with the addition of PDT. However the most exciting endoscopic ablative modality appears to be intraductal radiofrequency ablation using the Habib catheter and device. Several case series have shown the effectiveness of this technique in ablating tumors. This technique is evolving and coupled with early diagnosis of CCA through cholangioscopy will allow for a curative therapy. The crux to the effective treatment of early cancerous lesions in the bile or pancreatic duct is the early diagnosis of such lesions. Effective endoscopic ablative therapy is now available with the advent of radiofrequency ablation probes that can be passed through the duodenoscope via ERCP.

Citations

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