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Dive into the research topics where Kazunaga Ishigaki is active.

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Featured researches published by Kazunaga Ishigaki.


Digestive Endoscopy | 2017

Indications for endoscopic ultrasonography (EUS)-guided biliary intervention: Does EUS always come after failed endoscopic retrograde cholangiopancreatography?

Yousuke Nakai; Hiroyuki Isayama; Natsuyo Yamamoto; Saburo Matsubara; Hirofumi Kogure; Suguru Mizuno; Tsuyoshi Hamada; Naminatsu Takahara; Rie Uchino; Dai Akiyama; Kaoru Takagi; Takeo Watanabe; Gyotane Umefune; Kazunaga Ishigaki; Minoru Tada; Kazuhiko Koike

Endoscopic ultrasonography‐guided biliary drainage (EUS‐BD), first reported as an alternative to percutaneous transhepatic biliary drainage (PTBD) after failed endoscopic retrograde cholangiopancreatography (ERCP), is increasingly reported as a primary procedure without failed ERCP. The present study aims to evaluate the outcomes of therapeutic biliary ERCP and to compare the safety and effectiveness of primary EUS‐BD with those of ERCP, rescue EUS‐BD and PTBD.


Pancreas | 2017

Prevalence of Pancreatic Cystic Lesions Is Associated With Diabetes Mellitus and Obesity: An Analysis of 5296 Individuals Who Underwent a Preventive Medical Examination

Suguru Mizuno; Hiroyuki Isayama; Yousuke Nakai; Takeharu Yoshikawa; Kazunaga Ishigaki; Saburo Matsubara; Natsuyo Yamamoto; Hideaki Ijichi; Keisuke Tateishi; Minoru Tada; Naoto Hayashi; Kazuhiko Koike

Objectives Pancreatic cystic lesions (PCLs) are considered precursors of pancreatic cancer. Diabetes mellitus (DM) and obesity are known as risk factors for pancreatic cancer. We investigated the prevalence of PCLs in the general population and the relationship between PCLs and DM/obesity. Methods This cross-sectional analysis included 5296 individuals who underwent a preventive medical examination between October 2006 and June 2013 at our institution. Magnetic resonance imaging, including magnetic resonance cholangiopancreatography, was performed using a 3.0-T system as part of a comprehensive health screening program. We investigated the prevalence and risk factors of PCLs. Results The prevalence of PCLs was 13.7%, which was increased according to age. Individuals with PCLs were more prone to obesity (body mass index, 24.0 vs 23.7 kg/m2 [P = 0.015]; waist circumference, 87.4 vs 85.5 cm [P < 0.001]). DM was more prevalent in individuals with PCLs (18.4% vs 10.5%, P < 0.001). In a multivariate analysis, age (odds ratio [OR], 1.06; P < 0.001), excess body mass index (OR, 1.26; P = 0.039), and DM (OR, 1.39; P = 0.005) were associated with PCLs. Conclusions The prevalence of PCLs detected by magnetic resonance imaging in a preventive medical examination was 13.7%. Pancreatic cystic lesions were significantly associated with DM and obesity.


Pancreas | 2017

Thromboembolisms in Advanced Pancreatic Cancer: A Retrospective Analysis of 475 Patients

Kazunaga Ishigaki; Yousuke Nakai; Hiroyuki Isayama; Kei Saito; Tsuyoshi Hamada; Naminatsu Takahara; Suguru Mizuno; Dai Mohri; Hirofumi Kogure; Saburo Matsubara; Natsuyo Yamamoto; Minoru Tada; Kazuhiko Koike

OBJECTIVES Pancreatic cancer is reported to be highly associated with thromboembolism (TE). The aim of this analysis is to clarify risk factors for TE and its clinical impact in Japanese patients with pancreatic cancer. METHODS Data on consecutive pancreatic cancer patients receiving systemic chemotherapy between August 1999 and July 2015 were retrospectively studied. Both symptomatic and asymptomatic, arterial and venous TEs were included in the analysis. Risk factors for TE development were analyzed using a proportional hazards model with death without TE as a competing risk. The impact of TE on survival was also evaluated using a time-dependent covariate multiple Cox model. RESULTS A total of 475 patients were included in the analysis, and 57 TEs (12%) were identified: 45 venous TEs and 12 arterial TEs. The median time to TE was 169 days and the median survival from TE was 65 days. Liver metastasis was the only significant risk factor for TE (subdistribution hazards ratio, 2.15; P = 0.01), and TE was significantly associated with poor prognosis (hazards ratio, 3.31; P < 0.01). CONCLUSIONS Thromboembolism was not uncommon in Japanese patients receiving chemotherapy for advanced pancreatic cancer and was associated with poor prognosis. Liver metastasis was the risk factor for TE.Objectives Pancreatic cancer is reported to be highly associated with thromboembolism (TE). The aim of this analysis is to clarify risk factors for TE and its clinical impact in Japanese patients with pancreatic cancer. Methods Data on consecutive pancreatic cancer patients receiving systemic chemotherapy between August 1999 and July 2015 were retrospectively studied. Both symptomatic and asymptomatic, arterial and venous TEs were included in the analysis. Risk factors for TE development were analyzed using a proportional hazards model with death without TE as a competing risk. The impact of TE on survival was also evaluated using a time-dependent covariate multiple Cox model. Results A total of 475 patients were included in the analysis, and 57 TEs (12%) were identified: 45 venous TEs and 12 arterial TEs. The median time to TE was 169 days and the median survival from TE was 65 days. Liver metastasis was the only significant risk factor for TE (subdistribution hazards ratio, 2.15; P = 0.01), and TE was significantly associated with poor prognosis (hazards ratio, 3.31; P < 0.01). Conclusions Thromboembolism was not uncommon in Japanese patients receiving chemotherapy for advanced pancreatic cancer and was associated with poor prognosis. Liver metastasis was the risk factor for TE.


Journal of Clinical Oncology | 2016

Risk factor of thrombosis and impact on prognosis in patients with pancreatic cancer receiving chemotherapy.

Kazunaga Ishigaki; Yousuke Nakai; Hiroyuki Isayama; Tsuyoshi Hamada; Naminatsu Takahara; Suguru Mizuno; Dai Mohri; Hirofumi Kogure; Saburo Matsubara; Natsuyo Yamamoto; Minoru Tada; Kazuhiko Koike

218 Background: Thromboembolism (TE) is common in cancer patients, and pancreatic cancer is reported to be highly associated with TE. The aim of this analysis is to clarify risk factors for TE and its clinical impact in pancreatic cancer patients. Methods: Data on consecutive pancreatic cancer patients receiving systemic chemotherapy between August 1999 and July 2015 were retrospectively studied. The diagnosis of TE was made on CT scan either performed for suspicious symptoms of TE or for evaluation of chemotherapy response, and TE was classified into two groups: arterial events including coronary artery disease (CAD), cerebrovascular disease and other artery thrombosis, and venous events including deep vein thrombosis/pulmonary embolism (DVT/PE), portal vein thrombosis (PVT) and IVC thrombosis. Overall survival and time to TE (TTE) were calculated by Kaplan-Meier analysis. Risk factors for TE development were analyzed using a Cox proportional hazards model. To evaluate the impact of TE on survival, multi...


Journal of Gastroenterology | 2017

Procalcitonin is a useful biomarker to predict severe acute cholangitis: a single-center prospective study

Gyotane Umefune; Hirofumi Kogure; Tsuyoshi Hamada; Hiroyuki Isayama; Kazunaga Ishigaki; Kaoru Takagi; Dai Akiyama; Takeo Watanabe; Naminatsu Takahara; Suguru Mizuno; Saburo Matsubara; Natsuyo Yamamoto; Yousuke Nakai; Minoru Tada; Kazuhiko Koike


Journal of Cancer Research and Clinical Oncology | 2015

The inhibition of renin-angiotensin system in advanced pancreatic cancer: an exploratory analysis in 349 patients

Yousuke Nakai; Hiroyuki Isayama; Takashi Sasaki; Naminatsu Takahara; Kei Saito; Kazunaga Ishigaki; Tsuyoshi Hamada; Suguru Mizuno; Koji Miyabayashi; Keisuke Yamamoto; Dai Mohri; Hirofumi Kogure; Natsuyo Yamamoto; Hideaki Ijichi; Keisuke Tateishi; Minoru Tada; Kazuhiko Koike


Investigational New Drugs | 2017

Gemcitabine and S-1 versus gemcitabine and cisplatin treatment in patients with advanced biliary tract cancer: a multicenter retrospective study

Naminatsu Takahara; Hiroyuki Isayama; Yousuke Nakai; Takashi Sasaki; Kazunaga Ishigaki; Kei Saito; Dai Akiyama; Rie Uchino; Suguru Mizuno; Hiroshi Yagioka; Hirofumi Kogure; Osamu Togawa; Saburo Matsubara; Yukiko Ito; Nobuo Toda; Minoru Tada; Kazuhiko Koike


Endoscopy | 2014

Endoscopic removal of a proximally migrated pancreatic stent using a gooseneck snare.

Kazunaga Ishigaki; Tsuyoshi Hamada; Hiroyuki Isayama; Hirofumi Kogure; Yousuke Nakai; Tomonori Wada; Kazuhiko Koike


Endoscopy | 2017

A novel “hitch-and-ride” deep biliary cannulation method during rendezvous endoscopic ultrasound-guided ERCP technique

Yousuke Nakai; Hiroyuki Isayama; Saburo Matsubara; Hirofumi Kogure; Suguru Mizuno; Tsuyoshi Hamada; Naminatsu Takahara; Tomoka Nakamura; Tatsuya Sato; Tsuyoshi Takeda; Ryunosuke Hakuta; Kazunaga Ishigaki; Kei Saito; Minoru Tada; Kazuhiko Koike


Pancreatology | 2016

Pancreatic cystic lesions as one of the obesity-related diseases:an interesting association with metabolic syndrome

Suguru Mizuno; Hiroyuki Isayama; Yousuke Nakai; Takeharu Yoshikawa; Kazunaga Ishigaki; Gyotane Umefune; Takeo Watanabe; Kaoru Takagi; Dai Akiyama; Rie Uchino; Naminatsu Takahara; Hirofumi Kogure; Saburo Matsubara; Natsuyo Yamamoto; Hideaki Ijichi; Keisuke Tateishi; Minoru Tada; Naoto Hayashi; Kazuhiko Koike

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