Publications by authors named "Masahiro Maeda"

Article Synopsis
  • Actinomycosis, an uncommon and inflammatory infection usually caused by Actinomyces israelii, can be difficult to diagnose, especially in patients with a history of abdominal cancer due to lack of specific symptoms.
  • A 72-year-old man with multiple abdominal surgeries for rectal cancer developed a mass that was initially thought to be a cancer recurrence, but it was later identified as an actinomyces infection after surgical resection.
  • This case underscores the importance of careful histopathological evaluation of abdominal masses before initiating chemotherapy, particularly in patients with previous cancer treatments.
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Objective: To report the rare case of a patient with a perianeurysmal cyst following stent-assisted coil embolization of an unruptured vertebral artery aneurysm.

Case Presentation: A 63-year-old woman underwent stent-assisted coil embolization for an unruptured vertebral artery aneurysm embedded in the brainstem (pons). Complete occlusion of the aneurysm was successfully achieved.

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Objectives: We have been performing preoperative coronary artery assessments and implementing coronary revascularization or intraoperative adjunctive therapies as needed in patients scheduled for carotid artery stenting (CAS) to prevent ischemic heart disease. In this study, we report the results of a retrospective observation of patients who underwent CAS under our treatment strategy to prevent perioperative coronary ischemic complications.

Methods: A total of 224 cases from January 2014 to December 2021 were included.

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Endoscopic ultrasound-guided gallbladder drainage for patients with cholecystitis and high surgical risk is commonly performed by dilating the fistula before inserting the delivery sheath; however, this carries an increased risk of peritonitis. To overcome this problem, we developed a new technique that did not require dilation, using a 0.035-inch stiff guidewire, and retrospectively evaluated the efficacy and safety of this technique.

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Background: Due to the lack of studies, the long-term prognoses of unfit patients with gastric cancer (GC) who did not receive any aggressive cancer treatment (best supportive care [BSC] cases) remain unclear, especially for those with potentially curable GC. We conducted this observational study to capture the real-world data of characteristics and outcomes for BSC cases.

Method: Consecutive clinical records of patients with GC diagnosed at Steel Memorial Muroran Hospital from January 2017 to December 2021 were analyzed.

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A 50-year-old man with a history of total gastrectomy, distal pancreatectomy, splenectomy, and Roux-en-Y reconstruction was admitted to our hospital with a gallbladder tumor that had infiltrated the liver and abdominal wall. Because malignant cells were not collected during the percutaneous biopsy, we planned to perform an endoscopic ultrasound-guided fine-needle biopsy with a 22-G Franseen needle using a forward-viewing echoendoscope. Using intermittent manual compression, the forward-viewing echoendoscope reached the duodenum under fluoroscopic guidance.

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Background: Gastric anisakiasis typically causes severe abdominal symptoms; however, we incidentally detected asymptomatic gastric anisakiasis cases during esophagogastroduodenoscopy. The factors associated with developing acute abdominal symptoms induced by gastric anisakiasis remain unclear. Therefore, this study aimed to investigate the clinical factors associated with abdominal symptoms of gastric anisakiasis by comparing symptomatic and asymptomatic cases.

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The effect of spermidine in extending healthy longevity has attracted attention. As people age, their ability to synthesize putrescine, the precursor of spermidine, declines, and its supplementation from the diet or gut bacteria is needed. Many bacteria synthesize spermidine, but no strains have been reported to excrete synthesized spermidine from the cells.

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Apolipoprotein E (apoE) interaction with amyloid β-protein precursor (APP) has garnered attention as the therapeutic target for Alzheimer's disease (AD). Having discovered the apoE antagonist (6KApoEp) that blocks apoE binding to N-terminal APP, we tested the therapeutic potential of 6KApoEp on AD-relevant phenotypes in amyloid β-protein precursor/presenilin 1 (APP/PS1) mice that express each human apoE isoform of apoE2, apoE3, or apoE4 (designated APP/PS1/E2, APP/PS1/E3, or APP/PS1/E4 mice). At 12 months of age, we intraperitoneally administered 6KApoEp (250 μg/kg) or vehicle once daily for 3 months.

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In the search for alternatives to 6-aminonicotinamide (6AN), a series of 6-aminonicotinic acid esters were designed and synthesized as precursors of 6-amino-NADP, a potent inhibitor of 6-phosphogluconate dehydrogenase (6PGD). Like 6AN, some of these esters were found to reverse the loss of histone 3 lysine 9 trimethylation (H3K9me3) in patient-derived pancreatic ductal adenocarcinoma (PDAC) distant metastasis (A38-5). Among them, 1-(((cyclohexyloxy)carbonyl)oxy)ethyl 6-aminonicotinate () showed more potent antiproliferative activity than 6AN.

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Article Synopsis
  • A 46-year-old woman was diagnosed with an ovarian tumor and sigmoid colon cancer, accompanied by significant fluid buildup (ascites).
  • She underwent surgery, which involved removing the sigmoid colon and both ovaries, and was later diagnosed with sigmoid colon cancer that had spread to the ovaries.
  • After the surgery, the ascites resolved, and tests indicated that excessive production of a protein called VEGF may have contributed to the fluid accumulation; the case highlights the rarity of pseudo-Meigs' syndrome without pleural effusion and its implications for treatment.
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Article Synopsis
  • The study investigates the effectiveness of early precut sphincterotomy compared to delayed precut techniques during ERCP for patients facing difficult biliary cannulation.
  • It found that early precutting resulted in a higher biliary cannulation rate (95%) compared to delayed precutting (73.3%).
  • Overall, early precut procedures are deemed safe and can enhance the success of biliary access while not significantly increasing adverse events like pancreatitis or bleeding.*
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Amyloid β-protein (Aβ) oligomers are involved in the early stages of Alzheimer's disease (AD) and antibodies against these toxic oligomers could be useful for accurate diagnosis of AD. We identified the toxic conformer of Aβ42 with a turn at positions 22/23, which has a propensity to form toxic oligomers. The antibody 24B3, developed by immunization of a toxic conformer surrogate E22P-Aβ9-35 in mice, was found to be useful for AD diagnosis using human cerebrospinal fluid (CSF).

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Blood levels of the extracellular matrix protein nephronectin (Npnt), a protein critical for kidney development, are elevated in autoimmune experimental autoimmune encephalitis (EAE) mice, which are a model for multiple sclerosis. We found here that treatment with anti-Npnt antibody directed against the αβ integrin-binding site (Npnt-blocking antibody) inhibits EAE development. The selenium transporter selenoprotein P (SeP) was identified as a novel Npnt-binding partner.

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Mesenteric lymph node metastasis of gastric cancer is extremely rare. We report the case of a patient with advanced gastric cancer having lymph node metastasis in the transverse mesocolon who underwent gastrectomy with lymph node dissection followed by chemotherapy. A 74-year-old male complaining of tarry stool was referred to our hospital for further examination following a diagnosis of gastric cancer by a local medical doctor.

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Objective: Mechanical thrombectomy (MT) for middle cerebral artery M2 occlusion (M2O) is challenging because the procedure is performed in a narrow and tortuous artery. In this study, we compared MT using an aspiration catheter (AC) versus a stent retriever (SR) used alone, and retrospectively evaluated the efficacy and safety of MT using an AC for M2O.

Methods: Seventy-four consecutive patients who underwent MT for M2O at our institution between April 2016 and April 2020 were evaluated.

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The tumor reduction effect of pembrolizumab is extremely high compared to standard chemotherapy and might show prolonged survival. Therefore, the MSI status should be examined in patients with cholangiocarcinoma.

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The performance of sunscreen products depends on their ultraviolet (UV) absorption ability through the film formed on the skin surface upon their application. Therefore, it is important that a uniform film is formed on the uneven skin surface for effective sunscreen performance. Because most UV filters are oil soluble, we hypothesized in this study that increasing the viscosity of the oil phase of a sunscreen product can improve the performance of the sunscreen.

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Background: Situs inversus totalis (SIT) is a rare congenital condition in which the thoracic and abdominal organs are inverted like a mirror image.

Case Report: We present a case of synchronous gastric cancer and gastrointestinal stromal tumor (GIST) associated with SIT in a 74-year-old man who was admitted to our department to treat gastric cancer. Esophagogastroduodenoscopy revealed a depressed lesion and a submucosal tumor (SMT) in the middle-third of the stomach.

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Background: This study aimed to investigate the efficacy of enteral supplementation of vitamin B12 for vitamin B12 deficiency in patients who underwent total gastrectomy for gastric cancer.

Methods: The study enrolled 133 patients who underwent total gastrectomy for gastric cancer at Kochi Medical School. Clinical data were obtained to investigate associations between vitamin B12 supplementation and vitamin B12 levels.

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Objective: A case of posterior cerebral artery (P1 segment) occlusion with consciousness disturbance and Weber's syndrome treated by mechanical thrombectomy is reported.

Case Presentation: The patient was a 69-year-old man with consciousness disturbance, left hemiparesis, and anisocoria. MRI revealed acute cerebral infarction in the midbrain and right thalamus.

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Cancer-associated fibroblasts (CAFs) tend to have tumor-promoting capacity, and can provide therapeutic targets. Even without cancer cells, CAF phenotypes are stably maintained, and DNA methylation and H3K27me3 changes have been shown to be involved. Here, we searched for a potential therapeutic target in primary CAFs from gastric cancer and a mechanism for its dysregulation.

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