Masaya Iwamuro
Okayama University
CancerInternal medicineRadiologySurgeryPathologyBiopsyHelicobacter pyloriDuodenumFollicular lymphomaColonoscopyEndoscopyLymphomaStomachEsophagogastroduodenoscopyGastric mucosaDuodenal NeoplasmCancer researchMedicineBiologyGastroenterology
241Publications
17H-index
1,291Citations
Publications 241
Newest
#1Hiroyuki Sakae (Okayama University)H-Index: 8
#2Hiromitsu Kanzaki (Okayama University)H-Index: 16
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 15 authors...
Background Diffuse redness is a characteristic endoscopic finding that indicates current infection of Helicobacter pylori, which is reduced after successful eradication. Linked color imaging (LCI) has been reported to improve the visibility of diffuse redness compared to white light imaging (WLI); however, quantitative evaluation has not been reported. Aims This study aimed to objectively evaluate the color change of the gastric mucosa after H. pylori eradication. Methods Images of the greater c...
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#1Yuki Okamoto (Okayama University)H-Index: 3
#2Hiromitsu Kanzaki (Okayama University)H-Index: 16
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 9 authors...
Introduction Gastric adenomas are histologically defined as benign epithelial tumors. While some of them remain adenomas for a long time, others progress to carcinomas. However, long-term outcomes of such cases are not entirely clear. Here, we explored the risk factors and incidence of developing carcinoma from gastric adenoma as well as metachronous gastric cancer. Methods This study was conducted at a facility that adopted a follow-up strategy for gastric adenoma. Lesions histologically diagno...
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#1Masaya Iwamuro (Okayama University)H-Index: 17
#2Ken-ichi Matsuoka (Okayama University)H-Index: 17
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 4 authors...
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#1Yuka Obayashi (Okayama University)H-Index: 5
#2Seiji Kawano (Okayama University)H-Index: 12
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 11 authors...
Objective The eradication of Helicobacter pylori (H. pylori) reduces the risk for gastric cancer (GC) development, but it cannot prevent GC completely. We investigated the risk factors of early GC development after the eradication of H. pylori, based on the histological characteristics of gastric mucosa. Methods Sixty-one patients who underwent endoscopic submucosal dissection for early GC after successful H. pylori eradication (Group A) and 122 patients without developing a gastric neoplasm ove...
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#1Masaya Iwamuro (Okayama University)H-Index: 17
#2Chiaki KusumotoH-Index: 4
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 12 authors...
The aim of this study was to reveal the histological features of oxyntic gland adenomas and gastric adenocarcinoma of the fundic-gland type (GA-FG). We retrospectively examined the histological features of 126 lesions of oxyntic gland adenoma and/or GA-FG in 116 patients. The prevalence of oxyntic gland adenomas and GA-FG was approximately equal. The majority of the lesions were resected by endoscopic mucosal resection using a diathermic snare (EMR, n = 42) or endoscopic submucosal dissection (E...
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Background Recent improvements in the prognosis of patients with esophageal cancer have led to the increased occurrence of gastric tube cancer (GTC) in the reconstructed gastric tube. However, there are few reports on the treatment results of endoscopic submucosal dissection (ESD) for GTC. Aim To evaluate the efficacy and safety of ESD for GTC after esophagectomy in a multicenter trial. Methods We retrospectively investigated 48 GTC lesions in 38 consecutive patients with GTC in the reconstructe...
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#1Takehiro Tanaka (Okayama University)H-Index: 23
#2Kenji Nishida (Okayama University)H-Index: 6
Last. Tadashi Yoshino (Okayama University)H-Index: 76
view all 5 authors...
In this report, we describe a patient with myoepithelial hamartoma, which is regarded as synonymous with adenomyosis and heterotopic pancreas. Endoscopy revealed a submucosal tumor in the antrum of the stomach. Subsequently, distal gastrectomy with Roux-en-Y reconstruction was performed. Histological findings of adenomyomatous lesion and heterotopic pancreatic tissue were observed in this lesion. The distribution of OCT4, which is a pluripotency marker, varied in each part.
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#1Masaya Iwamuro (Okayama University)H-Index: 17
#2Hidenori Shiraha (Okayama University)H-Index: 26
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 6 authors...
Laminins (Ln), a type of extracellular matrix glycoprotein, are key regulators of cellular behavior. Recent work revealed that in various tumor cell lines, laminin isoforms influence specific responses, such as cell anchorage, survival, proliferation, migration, organization, and specialization. The contribution of laminin isoforms to the function of gastric cancer cells, however, remain unclear. Here, we revealed that in gastric cancer, laminin isoforms Ln411, Ln421, Ln511, and Ln521 promote ce...
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#1Masaya Iwamuro (Okayama University)H-Index: 17
#2Nobuharu Fujii (Okayama University)H-Index: 20
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 7 authors...
We herein report a patient who presented with follicular lymphoma. Although the stomach was initially intact, mucosal redness and multiple erosions appeared in the gastric body owing to infiltration of the follicular lymphoma cells. Subsequently, a slightly depressed, white area lacking gastric mucosal structure was detected in the lesser curvature of the gastric cardia and body, where lymphoma cell infiltration was also pathologically observed beneath the stratified squamous epithelium. This ca...
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#1Masaya Iwamuro (Okayama University)H-Index: 17
#2Hiroshi MatsushitaH-Index: 10
Last. Hiroyuki Okada (Okayama University)H-Index: 59
view all 4 authors...
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