医学博士, 信州大学

Gastroenterology

Long-term evaluation of Helicobacter pylori screening in school health checkups: an 11-year study in Japan
Takuma Okamura, Akihiro Ito, Yugo Iwaya, Tadanobu Nagaya, Atsuhiro Hirayama, Hiroyoshi Ota, Taiji Akamatsu
Journal of Gastroenterology, 60(6), 696-704, Jun. 2025

【全身性疾患を見逃すな!-内視鏡所見から読み解く-】主に胃病変を生じる全身性疾患　なだらかな胃粘膜下腫瘍様病変　ALアミロイドーシス
岡村卓磨，岩谷勇吾，長屋匡信
消化器内視鏡, 36(6), 860-862, Jun. 2024

Diagnosis by combination of endoscopic findings helps differentiate non-Helicobacter pylori Helicobacter-infected gastritis from Helicobacter pylori-infected gastritis
Takuma Okamura, Yugo Iwaya, Tadanobu Nagaya, Kazuki Horiuchi, Tatsuya Negishi, Hiroyoshi Ota, Takeji Umemura
Helicobacter, 29(2), Mar. 2024

Predictive Insights Into Exocrine Pancreatic Insufficiency in Chronic Pancreatitis and Autoimmune Pancreatitis: A Decision Tree Approach
Tomoyuki Tanaka, Takefumi Kimura, Shun-Ichi Wakabayashi, Takuma Okamura, Shohei Shigeto, Naoki Tanaka, Shohei Kondo, Ichitaro Horiuchi, Yasuhiro Kuraishi, Akira Nakamura, Norihiro Ashihara, Keita Kanai, Tadanobu Nagaya, Takayuki Watanabe, Takeji Umemura
Pancreas, 53(1), Jan. 2024

Relationship between Helicobacter pylori Eradication and Barrett's Esophagus Elongation
Kenta Hashigami, Yugo Iwaya, Tadanobu Nagaya, Daichi Hara, Atsuhiro Hirayama, Takuma Okamura , Taiji Akamatsu, Takeji Umemura
Digestion, 105(3), Jan. 2024

Association between endoscopic evidence of bile reflux and Barrett's esophagus: A large-scale case-control study
Yugo Iwaya, Kenichi Goda, Satoko Kako, Honoka Hattori, Takayuki Miyazawa, Daichi Hara, Kenta Hashigami, Atsuhiro Hirayama, Takuma Okamura, Tadanobu Nagaya, Takeji Umemura
Dig Liver Dis, 56(4), 622-627, Dec. 2023

Pinstripe Pattern of Esophageal Achalasia Demonstrated With Texture and Color Enhancement Imaging
Yugo Iwaya, Takuma Okamura, Tadanobu Nagaya
Clin Gastroenterol Hepatol, 22(2), Sep. 2023

Diffuse vascular ectasia
岡村卓磨，岩谷勇吾，長屋匡信
消化器内視鏡, 35(4), 545-547, Apr. 2023

Gastric Cancer After Helicobacter pylori Eradication for Nodular Gastritis in an Adolescent
Takuma Okamura, Yugo Iwaya, Mai Iwaya, Tomonobu Koizumi, Tadanobu Nagaya
Cureus, Oct. 2022

Histopathologically defined intestinal metaplasia in lesser curvature of corpus prior to Helicobacter pylori eradication is a risk factor for gastric cancer development
Daichi Hara, Takuma Okamura, Yugo Iwaya, Tadanobu Nagaya, Hiroyoshi Ota, Takeji Umemura
HELICOBACTER, Oct. 2022

Vascular E-selectin Expression Detected in Formalin-fixed, Paraffin-embedded Sections With an E-selectin Monoclonal Antibody Correlates With Ulcerative Colitis Activity
Murahashi, Masataka; Kogami, Akiya; Muramoto, Akifumi; Hoshino, Hitomi; Akama, Tomoya O.; Mitoma, Junya; Goi, Takanori; Hirayama, Atsuhiro; Okamura, Takuma; Nagaya, Tadanobu; Kobayashi, Motohiro;
Journal of Histochemistry & Cytochemistry, 70(4), 299-310, Apr. 2022

【こんなときどうする】生検標本がうまく採取できない
岡村卓磨，岩谷勇吾，長屋匡信
消化器内視鏡, 34(3), 374-375, Mar. 2022

CD8(+) Lymphocyte Infiltration Is a Specific Feature of Colitis Induced by Immune Checkpoint Inhibitors
Takahashi, Yoshiyuki; Nagaya, Tadanobu; Iwaya, Yugo; Okamura, Takuma; Hirayama, Atsuhiro; Iwaya, Mai; Uehara, Takeshi; Umemura, Takeji;
DIGESTIVE DISEASES AND SCIENCES, 2022

Gastric adenocarcinoma arising from hamartomatous inverted polyp during 8-year follow-up
Okamura T, Iwaya Y, Nagaya T, Muranaka F, Ota H, Umemura T.
DEN OPEN, Aug. 2021

【エキスパートに学ぶ、安全で楽な外来内視鏡】外来内視鏡診療のリスク管理と対策
岡村卓磨，岩谷勇吾，長屋匡信
消化器内視鏡, 33(6), 948-954, Jun. 2021

【消化管悪性リンパ腫のすべて】稀な消化管原発悪性リンパ腫　消化管原発T細胞リンパ腫
岡村卓磨，岩谷勇吾，長屋匡信
消化器内視鏡, 33(5), 898-901, May 2021

Clinicopathological features of nodular gastritis in three classes of age
Kako, Satoko; Iwaya, Yugo; Nagaya, Tadanobu; Hara, Daichi; Okamura, Takuma; Iwaya, Mai; Kurasawa, Shingo; Kato, Sawako; Nakayama, Yoshiko; Akamatsu, Taiji; Umemura, Takeji;
HELICOBACTER, 2021

A case of giant enteric muco-submucosal elongated polyp detected by melena.
Okamura T, Oyama S, Matsumoto K, Saijo Y, Fujimoto H, Arakura N, Igarashi T, Usuda S, Mishima S, Kiyosawa K.
Clin J Gastroenterol, 13(6), Dec. 2020

HELICOBACTER PYLORI INFECTION AMONG YOUNG PEOPLE AND THEIR CHARACTERISTIC ENDOSCOPIC IMAGES
Uehara, Hiroyuki; Akamatsu, Taiji; Suga, Tomoaki; Nagaya, Tadanobu; Iwaya, Yugo; Okamura, Takuma; Ito, Akihiro; Tanaka, Eiji;
GASTROENTEROLOGY, 156(6), S526-S526, May 2019

Accuracy of Endoscopic Diagnosis for Mild Atrophic Gastritis Infected with Helicobacter pylori
Okamura T, Iwaya Y, Kitahara K, Suga T, Tanaka E.
Clin Endosc, 51(4), Jul. 2018

SCREENING FOR HELICOBACTER PYLORI (H. PYLORI) AMONG JAPANESE TEENAGERS AND THEIR CHARACTERISTIC ENDOSCOPIC FINDINGS ASSOCIATED WITH H. PYLORI INFECTION: A 10-YEAR EXPERIENCE OF A SCREENING PROCEDURE AND TREATMENT OF HIGH SCHOOL STUDENTS IN JAPAN
Uehara, Hiroyuki; Akamatsu, Taiji; Suga, Tomoaki; Okamura, Takuma; Ito, Akihiro; Tanaka, Eiji;
GASTROENTEROLOGY, 154(6), S16-S17, May 2018

A case of pancreatic malignant lymphoma with the onset of acute pancreatitis
青沼 宇倫;藤永 康成;大彌 歩;塚原 嘉典;岡村 卓磨;伊藤 哲也;佐藤 碧;角谷 眞澄
臨床放射線, 62(6), 823-828, Jun. 2017

【消化器内視鏡の基礎知識と基本テクニック】上部消化管内視鏡　治療　上部消化管異物回収術
岡村卓磨，菅智明
消化器内視鏡, 29(3), 474-476, Mar. 2017

【消化管疾患と皮膚病変】 長期にわたり頻回の内視鏡的バルーン拡張術を要した食道慢性GVHDの1例
平山敦大, 伊東哲宏, 関口智裕, 中村麗那, 北畠央之, 田中景子, 丸山康弘, 岡村卓磨, 岩谷勇吾, 北原桂, 古賀弘志, 中澤英之, 伊藤俊朗, 太田浩良, 菅智明
胃と腸, 51(8), 1055-1060, Jul. 2016

The loop-forming method as a useful technique to rotate the endoscopic insertion tube shaft.
Suga T, Okamura T, Arakura N, Tanaka E.
Endosc Int Open, 4(2), E170-4, Feb. 2016

A case of acquired hemophilia A diagnosed after percutaneous endoscopic gastrostomy.
Okamura T, Komatsu M, Ito A, Ito T, Suga T, Arakura N, Sakai H, Tanaka E.
Clin J Gastroenterol, 8(5), 290-3, Oct. 2015

Reduced gland mucin-specific O-glycan in gastric atrophy: A possible risk factor for differentiated-type adenocarcinoma of the stomach.
Yamada S, Okamura T, Kobayashi S, Tanaka E, Nakayama J.
J Gastroenterol Hepatol, 30(10), 1478-84, Oct. 2015

Screening to Identify and Eradicate Helicobacter pylori Infection in Teenagers in Japan.
Akamatsu T, Okamura T, Iwaya Y, Suga T.
Gastroenterol Clin North Am, 44(3), 667-76, Sep. 2015

【消化管原発悪性リンパ腫】 濾胞性リンパ腫の治療方針　積極的に治療する立場から
奥原禎久, 丸山康弘, 中村晃, 岡村卓磨, 菅智明
消化器内視鏡, 27(5), 820-826, May 2015

H.pylori感染症スクリーニング検査の学校検診への導入
岡村卓磨, 菅智明, 横澤秀一, 新倉則和, 松本竹久, 奥平貞英, 赤松泰次, 田中榮司
日本ヘリコバクター学会誌, 16(2), 10-15, Jan. 2015

Superficially located enlarged lymphoid follicles characterise nodular gastritis.
Okamura T, Sakai Y, Hoshino H, Iwaya Y, Tanaka E, Kobayashi M.
PATHOLOGY, 47(1), 38-44, Jan. 2015

Eosinophilic gastroenteritis complicated with Helicobacter pylori infection unresponsive to eradication therapy.
Nakamura A, Iwaya Y, Iwaya M, Okamura T, Kobayashi S, Daikuhara S, Nozawa Y, Fukuzawa S, Nakamura S, Okuhara S, Yamada S, Yokosawa S, Suga T, Arakura N, Tanaka E.
Intern Med, 53(18), Sep. 2014

Antimicrobial Resistance and Characteristics of Eradication Therapy of Helicobacter pylori in Japan: A Multi-Generational Comparison
Okamura T, Suga T, Nagaya T, Arakura N, Matsumoto T, Nakayama Y, Tanaka E.
HELICOBACTER, 19(3), Jun. 2014

Helicobacter pylori 感染症時代の除菌診療 : その課題とは何か(第24回)長野県におけるHelicobacter pylori除菌療法の実際と課題
岡村 卓磨;長屋 匡信;菅 智明;新倉 則和
Helicobacter research : Journal of helicobacter research, 18(3), 200,282-286, Jun. 2014

Expanded indications for endoscopic submucosal dissection using mucin histochemistry in the treatment of early undifferentiated gastric carcinoma
岡村 卓磨;長屋 匡信;岩谷 勇吾
消化器内科, 58(3), 283-290, Mar. 2014

A case of Helicobacter heilmannii-associated primary gastric mucosa-associated lymphoid tissue lymphoma achieving complete remission after eradication
Okamura T, Iwaya Y, Yokosawa S, Suga T, Arakura N, Matsumoto T, Ogiwara N, Higuchi K, Ota H, Tanaka E.
Clin J Gastroenterol, 6(1), Feb. 2013

Helicobacter pylori-Negative Primary Rectal MALT Lymphoma: Complete Remission after Radiotherapy
Okamura T, Suga T, Iwaya Y, Ito T, Yokosawa S, Arakura N, Ota H, Tanaka E.
Case Rep Gastroenterol, 6(2), May 2012

A CASE OF METASTASIS TO THE SMALL INTESTINE FROM ESOPHAGEAL SQUAMOUS CELL CARCINOMA PRESENTED WITH SMALL BOWEL OBSTRUCTION
AKITA Shingo;KOYAMA Yoshinori;KASAI Hide;KUMEDA Shigeyoshi;OKAMURA Takuma;SHIMOJO Hisashi
Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association), 72(3), 652-657, 25 Mar. 2011