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Shiro Oka

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Takayasu Kuwabara; Shiro Oka; Fumio Shimamoto; Shinji Tanaka; Yuji Urabe; Masaharu Yoshihara; Koji Arihiro; Toru Hiyama; Kazuaki Chayama
Response.
Shiro Oka; Shinji Tanaka; Hiroyuki Kanao; Koichi Nakadoi; Kazuaki Chayama
Risk analysis of submucosal invasive rectal carcinomas for lymph node metastasis to expand indication criteria for endoscopic resection.
Taiki Aoyama; Hiroshi Aikata; Noriaki Naeshiro; Makoto Nakano; Shiro Oka; Shinji Tanaka; Ikue Watari; Shigeto Yoshida; Kazuaki Chayama
Small bowel abnormalities in patients with compensated liver cirrhosis.

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2013: Takayasu Kuwabara; Shiro Oka; Fumio Shimamoto; Shinji Tanaka; Yuji Urabe; Masaharu Yoshihara; Koji Arihiro; Toru Hiyama; Kazuaki Chayama
Response.
Gastrointestinal endoscopy 2013;77(6):973-4.
2013: Shiro Oka; Shinji Tanaka; Hiroyuki Kanao; Koichi Nakadoi; Kazuaki Chayama
Risk analysis of submucosal invasive rectal carcinomas for lymph node metastasis to expand indication criteria for endoscopic resection.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2013;25 Suppl 2():21-5.
2013: Taiki Aoyama; Hiroshi Aikata; Noriaki Naeshiro; Makoto Nakano; Shiro Oka; Shinji Tanaka; Ikue Watari; Shigeto Yoshida; Kazuaki Chayama
Small bowel abnormalities in patients with compensated liver cirrhosis.
Digestive diseases and sciences 2013;58(5):1390-6.
2013: Sayaka Takata; Shinji Tanaka; Motomi Terasaki; Shigeto Yoshida; Nana Hayashi; Hiroyuki Kanao; Koichi Nakadoi; Shiro Oka; Kazuaki Chayama
Characteristic magnifying narrow-band imaging features of colorectal tumors in each growth type.
International journal of colorectal disease 2013;28(4):459-68.
2013: Shinji Tanaka; Nana Hayashi; Shiro Oka; Kazuaki Chayama
Endoscopic assessment of colorectal cancer with superficial or deep submucosal invasion using magnifying colonoscopy.
Clinical endoscopy 2013;46(2):138-46.
2013: Shinji Tanaka; Motomi Terasaki; Nana Hayashi; Shiro Oka; Kazuaki Chayama
Warning for unprincipled colorectal endoscopic submucosal dissection: accurate diagnosis and reasonable treatment strategy.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2013;25(2):107-16.
2013: Makoto Higashimaya; Norifumi Numata; Shiro Oka; Yoji Sanomura; Shinji Tanaka; Shigeto Yoshida; Koji Arihiro; Kazuaki Chayama
Endoscopic submucosal dissection for residual early gastric cancer after endoscopic submucosal dissection.
Gastrointestinal endoscopy 2013;77(2):298-302.
2013: Nana Hayashi; Hiroyuki Kanao; Shiro Oka; Shinji Tanaka; Shigeto Yoshida; Kazuaki Chayama
Relationship between narrow-band imaging magnifying observation and pit pattern diagnosis in colorectal tumors.
Digestion 2013;87(1):53-8.
2012: Takayasu Kuwabara; Shiro Oka; Fumio Shimamoto; Shinji Tanaka; Yuji Urabe; Masaharu Yoshihara; Koji Arihiro; Toru Hiyama; Kazuaki Chayama
Clinical features of pharyngeal intraepithelial neoplasias and outcomes of treatment by endoscopic submucosal dissection.
Gastrointestinal endoscopy 2012;76(6):1095-103.
2012: Shiro Oka; Yoji Sanomura; Shinji Tanaka; Norifumi Numata; Kazuaki Chayama
[Endoscopic diagnosis of early gastric cancer].
Nihon rinsho. Japanese journal of clinical medicine 2012;70(10):1742-7.
2012: Koichi Nakadoi; Shiro Oka; Shun-ichiro Ozawa; Sayaka Takata; Shinji Tanaka; Motomi Terasaki; Nana Hayashi; Hiroyuki Kanao; Kazuaki Chayama
Clinical outcomes of endoscopic submucosal dissection for rectal tumor close to the dentate line.
Gastrointestinal endoscopy 2012;76(2):444-50.
2012: Koichi Nakadoi; Shiro Oka; Sayaka Takata; Shinji Tanaka; Motomi Terasaki; Shigeto Yoshida; Koji Arihiro; Hiroyuki Kanao; Kazuaki Chayama
Management of T1 colorectal carcinoma with special reference to criteria for curative endoscopic resection.
Journal of gastroenterology and hepatology 2012;27(6):1057-62.
2012: Shiro Oka; Sayaka Takata; Shinji Tanaka; Hiroyuki Kanao; Kazuaki Chayama
Usefulness and safety of SB knife Jr in endoscopic submucosal dissection for colorectal tumors.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2012;24 Suppl 1():90-5.
2012: Shinji Tanaka; Motomi Terasaki; Hiroyuki Kanao; Shiro Oka; Kazuaki Chayama
Current status and future perspectives of endoscopic submucosal dissection for colorectal tumors.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2012;24 Suppl 1():73-9.
2012: Keiichi Onji; Yoshito Takemura; Shinji Tanaka; Hiroyasu Yamada; Shigeto Yoshida; Masaharu Yoshihara; Shiro Oka; Masazumi Okajima; Kazuaki Chayama
Microvascular structure and perfusion imaging of colon cancer by means of contrast-enhanced ultrasonography.
Abdominal imaging 2012;37(2):297-303.
2012: Takayoshi Shishido; Yoshito Takemura; Shinji Tanaka; Shigeto Yoshida; Hiroki Imagawa; Shiro Oka; Kazuaki Chayama
Outcome of patients who have undergone total enteroscopy for obscure gastrointestinal bleeding.
World journal of gastroenterology : WJG 2012;18(7):666-72.
2012: Takayasu Kuwabara; Shiro Oka; Shinji Tanaka; Kazuaki Chayama; Toru Hiyama; Masaharu Yoshihara
Compliance with standard precautions among gastrointestinal endoscopists and endoscopy nurses in Japan.
American journal of infection control 2012;40(1):80.
2012: Yoji Sanomura; Takayoshi Shishido; Shinji Tanaka; Shigeto Yoshida; Makoto Higashiyama; Toru Hiyama; Hiroki Imagawa; Ikue Noda; Shiro Oka; Koji Arihiro; Kazuaki Chayama
Clinical validity of endoscopic submucosal dissection for submucosal invasive gastric cancer: a single-center study.
Gastric cancer : official journal of the International Gastric Cancer Association and the Japanese Gastric Cancer Association 2012;15(1):97-105.
2011: Makoto Higashiyama; Hiroki Imagawa; Shiro Oka; Yoji Sanomura; Takayoshi Shishido; Shinji Tanaka; Shigeto Yoshida; Kazuaki Chayama
Risk factors for bleeding after endoscopic submucosal dissection of gastric epithelial neoplasm.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2011;23(4):290-5.
2011: Takako Shimomura; Shinji Tanaka; Masaharu Yoshihara; Toru Hiyama; Shiro Oka; Fumio Shimamoto; Kazuaki Chayama
Frequent somatic mutations of mitochondrial DNA in traditional serrated adenomas but not in sessile serrated adenomas of the colorectum.
Journal of gastroenterology and hepatology 2011;26(10):1565-9.
2011: Hiroki Imagawa; Ikue Noda; Shiro Oka; Youji Sanomura; Takayoshi Shishido; Shinji Tanaka; Shigeto Yoshida; Makoto Higashiyama; Kazuaki Chayama
Improved detectability of small-bowel lesions via capsule endoscopy with computed virtual chromoendoscopy: a pilot study.
Scandinavian journal of gastroenterology 2011;46(9):1133-7.
2011: Shiro Oka; Shinji Tanaka; Sayaka Takata; Hiroyuki Kanao; Kazuaki Chayama
Clinical usefulness of narrow band imaging magnifying classification for colorectal tumors based on both surface pattern and microvessel features.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2011;23 Suppl 1():101-5.
2011: S Oba; Shinji Tanaka; yasushi sano; Shiro Oka; Kazuaki Chayama
Current status of narrow-band imaging magnifying colonoscopy for colorectal neoplasia in Japan.
Digestion 2011;83(3):167-72.
2010: Yoji Sanomura; Shiro Oka; Shinji Tanaka; Makoto Higashiyama; Shigeto Yoshida; Koji Arihiro; Fumio Shimamoto; Kazuaki Chayama
Predicting the absence of lymph node metastasis of submucosal invasive gastric cancer: expansion of the criteria for curative endoscopic resection.
Scandinavian journal of gastroenterology 2010;45(12):1480-7.
2010: Aki Matsumoto; Shinji Tanaka; Sayaka Oba; Hiroyuki Kanao; Shiro Oka; Masaharu Yoshihara; Kazuaki Chayama
Outcome of endoscopic submucosal dissection for colorectal tumors accompanied by fibrosis.
Scandinavian journal of gastroenterology 2010;45(11):1329-37.
2010: Sayaka Oba; Shinji Tanaka; Shiro Oka; Hiroyuki Kanao; Sigeto Yoshida; Fumio Shimamoto; Kazuaki Chayama
Characterization of colorectal tumors using narrow-band imaging magnification: combined diagnosis with both pit pattern and microvessel features.
Scandinavian journal of gastroenterology 2010;45(9):1084-92.
2010: Shiro Oka; Shinji Tanaka; Shigeto Yoshida; Toru Hiyama; Yoshitaka Ueno; Masanori Ito; Yasuhiko Kitadai; Masaharu Yoshihara; Kazuaki Chayama
A water-soluble extract from culture medium of Ganoderma lucidum mycelia suppresses the development of colorectal adenomas.
Hiroshima journal of medical sciences 2010;59(1):1-6.
2010: Tatsuma Fukuhara; Toru Hiyama; Shinji Tanaka; Shiro Oka; Masaharu Yoshihara; Koji Arihiro; Kazuaki Chayama
Characteristics of esophageal squamous cell carcinomas and lugol-voiding lesions in patients with head and neck squamous cell carcinoma.
Journal of clinical gastroenterology 2010;44(2):e27-33.
2010: Kazuaki Tanabe; Yuji Urabe; Noriaki Tokumoto; Takahisa Suzuki; Hideki Yamamoto; Shiro Oka; Shinji Tanaka; Hideki Ohdan
A new method for intraluminal gastrointestinal stromal tumor resection using laparoscopic seromuscular dissection technique.
Digestive surgery 2010;27(6):461-5.
2009: Shiro Oka; Shinji Tanaka; Hiroyuki Kanao; Sayaka Oba; Kazuaki Chayama
Therapeutic strategy for colorectal laterally spreading tumor.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2009;21 Suppl 1():S43-6.
2009: Shinji Tanaka; Shiro Oka; Kazuaki Chayama; Koichi Kawashima
Knack and practical technique of colonoscopic treatment focused on endoscopic mucosal resection using snare.
Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society 2009;21 Suppl 1():S38-42.
2009: Ritsuo Mouri; Shigeto Yoshida; Shinji Tanaka; Shiro Oka; Masaharu Yoshihara; Kazuaki Chayama
Evaluation and validation of computed virtual chromoendoscopy in early gastric cancer.
Gastrointestinal endoscopy 2009;69(6):1052-8.
2009: Y Urabe; T Hiyama; Shinji Tanaka; Shiro Oka; Masaharu Yoshihara; Koji Arihiro; Kazuaki Chayama
Metachronous multiple esophageal squamous cell carcinomas and Lugol-voiding lesions after endoscopic mucosal resection.
Endoscopy 2009;41(4):304-9.
2009: Akira Fukumoto; Shinji Tanaka; Takayoshi Shishido; Yoshito Takemura; Shiro Oka; Kazuaki Chayama
Comparison of detectability of small-bowel lesions between capsule endoscopy and double-balloon endoscopy for patients with suspected small-bowel disease.
Gastrointestinal endoscopy 2009;69(4):857-65.
2009: Ritsuo Mouri; Shigeto Yoshida; Shinji Tanaka; Shiro Oka; Masaharu Yoshihara; Kazuaki Chayama
Usefulness of endoscopic ultrasonography in determining the depth of invasion and indication for endoscopic treatment of early gastric cancer.
Journal of clinical gastroenterology 2009;43(4):318-22.
2009: Hiroyuki Kanao; Shinji Tanaka; Shiro Oka; Mayuko Hirata; Shigeto Yoshida; Kazuaki Chayama
Narrow-band imaging magnification predicts the histology and invasion depth of colorectal tumors.
Gastrointestinal endoscopy 2009;69(3 Pt 2):631-6.
2009: Toshiki Yamaguchi; Shigeto Yoshida; Shinji Tanaka; Yoshito Takemura; Shiro Oka; Masaharu Yoshihara; Hiroyasu Yamada; Kazuaki Chayama
Predicting the clinical response to cytapheresis in steroid-refractory or -dependent ulcerative colitis using contrast-enhanced ultrasonography.
Scandinavian journal of gastroenterology 2009;44(7):831-7.
2009: Akira Fukumoto; Shinji Tanaka; Hiroki Imagawa; Takayoshi Shishido; Shiro Oka; Shigeto Yoshida; Hiroyasu Yamada; Kazuaki Chayama
Usefulness and limitations of transabdominal ultrasonography for detecting small-bowel tumors.
Scandinavian journal of gastroenterology 2009;44(3):332-8.
2008: Madoka Nakao; Shigeto Yoshida; Shinji Tanaka; Yoshito Takemura; Shiro Oka; Masaharu Yoshihara; Kazuaki Chayama
Optical biopsy of early gastroesophageal cancer by catheter-based reflectance-type laser-scanning confocal microscopy.
Journal of biomedical optics 2008;13(5):054043.
2008: Akira Fukumoto; Shinji Tanaka; Takayoshi Shishido; Shiro Oka; Kazuaki Chayama
[Diagnosis and treatment for benign small bowel tumor].
Nihon rinsho. Japanese journal of clinical medicine 2008;66(7):1305-11.
2008: Hiroyuki Kanao; Shinji Tanaka; Shiro Oka; Iwao Kaneko; Shigeto Yoshida; Koji Arihiro; Masaharu Yoshihara; Kazuaki Chayama
Clinical significance of type V(I) pit pattern subclassification in determining the depth of invasion of colorectal neoplasms.
World journal of gastroenterology : WJG 2008;14(2):211-7.
2008: Shinji Tanaka; Shiro Oka; Kazuaki Chayama
Colorectal endoscopic submucosal dissection: present status and future perspective, including its differentiation from endoscopic mucosal resection.
Journal of gastroenterology 2008;43(9):641-51.
2007: Mayuko Hirata; Shinji Tanaka; Shiro Oka; Iwao Kaneko; Shigeto Yoshida; Masaharu Yoshihara; Kazuaki Chayama
Evaluation of microvessels in colorectal tumors by narrow band imaging magnification.
Gastrointestinal endoscopy 2007;66(5):945-52.
2007: Iwao Kaneko; Shinji Tanaka; Shiro Oka; Shigeto Yoshida; Toru Hiyama; Koji Arihiro; Fumio Shimamoto; Kazuaki Chayama
Immunohistochemical molecular markers as predictors of curability of endoscopically resected submucosal colorectal cancer.
World journal of gastroenterology : WJG 2007;13(28):3829-35.
2007: Shigeto Yoshida; Shinji Tanaka; Mayuko Hirata; Ritsuo Mouri; Iwao Kaneko; Shiro Oka; Masaharu Yoshihara; Kazuaki Chayama
Optical biopsy of GI lesions by reflectance-type laser-scanning confocal microscopy.
Gastrointestinal endoscopy 2007;66(1):144-9.
2007: Shinji Tanaka; Shiro Oka; Iwao Kaneko; Mayuko Hirata; Ritsuo Mouri; Hiroyuki Kanao; Shigeto Yoshida; Kazuaki Chayama
Endoscopic submucosal dissection for colorectal neoplasia: possibility of standardization.
Gastrointestinal endoscopy 2007;66(1):100-7.
2007: Mayuko Hirata; Shinji Tanaka; Shiro Oka; Iwao Kaneko; Shigeto Yoshida; Masaharu Yoshihara; Kazuaki Chayama
Magnifying endoscopy with narrow band imaging for diagnosis of colorectal tumors.
Gastrointestinal endoscopy 2007;65(7):988-95.
2007: Iwao Kaneko; Shinji Tanaka; Shiro Oka; Toru Kawamura; Toru Hiyama; Masanori Ito; Masaharu Yoshihara; Fumio Shimamoto; Kazuaki Chayama
Lymphatic vessel density at the site of deepest penetration as a predictor of lymph node metastasis in submucosal colorectal cancer.
Diseases of the colon and rectum 2007;50(1):13-21.
2006: Shiro Oka; Shinji Tanaka; Iwao Kaneko; Ritsuo Mouri; Mayuko Hirata; Toru Kawamura; Masaharu Yoshihara; Kazuaki Chayama
Advantage of endoscopic submucosal dissection compared with EMR for early gastric cancer.
Gastrointestinal endoscopy 2006;64(6):877-83.
2006: Shiro Oka; Shinji Tanaka; Iwao Kaneko; Ritsuo Mouri; Mayuko Hirata; Hiroyuki Kanao; Toru Kawamura; Shigeto Yoshida; Masaharu Yoshihara; Kazuaki Chayama
Endoscopic submucosal dissection for residual/local recurrence of early gastric cancer after endoscopic mucosal resection.
Endoscopy 2006;38(10):996-1000.
2006: Hiroyuki Ueda; Masanori Ito; Shinji Tanaka; Shiro Oka; Shunsuke Takata; Shinobu Imagawa; Xue Fei Xie; Masaharu Yoshihara; Ken Haruma; Kazuaki Chayama
The effect of Helicobacter pylori eradication therapy on gastric ulcer healing after endoscopic mucosal resection.
Journal of clinical gastroenterology 2006;40(4):293-6.
2005: Masanori Ito; Shinji Tanaka; Shunsuke Takata; Shiro Oka; Shinobu Imagawa; Hiroyuki Ueda; Yasuo Egi; Yasuhiko Kitadai; W Yasui; Masaharu Yoshihara; Ken Haruma; Kazuaki Chayama
Morphological changes in human gastric tumours after eradication therapy of Helicobacter pylori in a short-term follow-up.
Alimentary pharmacology & therapeutics 2005;21(5):559-66.
2004: Shigeto Yoshida; Shinji Tanaka; Daisuke Kamino; Madoka Nakao; Shiro Oka; Yasuhiko Kitadai; Norihiko Hayakawa; Ken Haruma; Kazuaki Chayama
Initial experience with catheter probe US when using a multibending endoscope.
Gastrointestinal endoscopy 2004;59(7):889-94.
2004: Shinji Tanaka; Shiro Oka; Kazuaki Chayama
[Advances of an internal treatment for early colorectal carcinoma].
Nihon Shokakibyo Gakkai zasshi = The Japanese journal of gastro-enterology 2004;101(5):486-94.
2004: Takehiko Ochiumi; Shinji Tanaka; Shiro Oka; Toru Hiyama; Masanori Ito; Yasuhiko Kitadai; Ken Haruma; Kazuaki Chayama
Clinical significance of angiopoietin-2 expression at the deepest invasive tumor site of advanced colorectal carcinoma.
International journal of oncology 2004;24(3):539-47.
2004: Shiro Oka; Shinji Tanaka; Toru Hiyama; Masanori Ito; Yasuhiko Kitadai; Masaharu Yoshihara; Ken Haruma; Kazuaki Chayama
Clinicopathologic and endoscopic features of colorectal serrated adenoma: differences between polypoid and superficial types.
Gastrointestinal endoscopy 2004;59(2):213-9.
2003: Shiro Oka; Shinji Tanaka; Shinji Nagata; Toru Hiyama; Masanori Ito; Yasuhiko Kitadai; Masaharu Yoshihara; Ken Haruma; Kazuaki Chayama
Clinicopathologic features and endoscopic resection of early primary nonampullary duodenal carcinoma.
Journal of clinical gastroenterology 2003;37(5):381-6.
2003: Eijiro Kaio; Shinji Tanaka; Shiro Oka; Toru Hiyama; Yasuhiko Kitadai; Ken Haruma; Kazuaki Chayama
Clinical significance of thrombospondin-1 expression in relation to vascular endothelial growth factor and interleukin-10 expression at the deepest invasive tumor site of advanced colorectal carcinoma.
International journal of oncology 2003;23(4):901-11.
2003: Shinji Tanaka; Shinji Nagata; Shiro Oka; Toshio Kuwai; Tadamasa Tamura; Kazuaki Chayama
[Treatment of colorectal carcinoma having submucosal invasion].
Nihon rinsho. Japanese journal of clinical medicine 2003;61 Suppl 7():286-90.
2003: Shiro Oka; Shinji Tanaka; Kazuaki Chayama
[Management of treatment in nodule-aggregating colorectal cancer].
Nihon rinsho. Japanese journal of clinical medicine 2003;61 Suppl 7():139-44.
2002: Shinji Tanaka; Shinji Nagata; Shiro Oka; Toshio Kuwai; Tadamasa Tamura; Yasuhiko Kitadai; Masaharu Sumii; Masaharu Yoshihara; Ken Haruma; Kazuaki Chayama
Determining depth of invasion by VN pit pattern analysis in submucosal colorectal carcinoma.
Oncology reports 2002;9(5):1005-8.
2002: Seiji Onogawa; Shinji Tanaka; Shiro Oka; Masao Morihara; Yasuhiko Kitadai; Masaharu Sumii; Masaharu Yoshihara; Fumio Shimamoto; Ken Haruma; Kazuaki Chayama
Clinical significance of angiogenesis in rectal carcinoid tumors.
Oncology reports 2002;9(3):489-94.
2001: Shinji Tanaka; Ken Haruma; Shiro Oka; R Takahashi; Masaki Kunihiro; Yasuhiko Kitadai; Masaharu Yoshihara; Fumio Shimamoto; Kazuaki Chayama
Clinicopathologic features and endoscopic treatment of superficially spreading colorectal neoplasms larger than 20 mm.
Gastrointestinal endoscopy 2001;54(1):62-6.