Publications by authors named "Hiroki Yamana"

Objective: Limitations are sometimes encountered in the application of laparoscopic cholecystectomy to the treatment of acute cholecystitis. Endoscopic gallbladder stenting (EGBS) has emerged as an additional option. However, the long-term stent patency remains an issue.

View Article and Find Full Text PDF
Article Synopsis
  • * Researchers evaluated 112 patients, focusing on factors like surgical outcomes, nutritional and kidney functions, and overall prognosis over two years.
  • * Although elderly patients had more postoperative complications, the results showed that NACRT followed by PD was safe for them and yielded a prognosis similar to that of younger patients, with certain low prognostic indicators noted for the elderly group.
View Article and Find Full Text PDF

Background: Despite a strong association between nutritional indices and disease prognosis, evidence regarding the evaluation of nutritional indices after preoperative treatment for pancreatic ductal adenocarcinoma (PDAC) is insufficient. We evaluated the clinical significance of the prognostic nutritional index (PNI) in patients with resectable (R-) and borderline resectable (BR-) PDAC who received neoadjuvant chemoradiotherapy (NACRT) followed by pancreatic resection.

Methods: We assessed 153 patients with R- and BR-PDAC who underwent NACRT followed by curative resection between 2009 and 2022.

View Article and Find Full Text PDF
Article Synopsis
  • The study evaluated the differences between pancreatic ductal adenocarcinoma (PDAC) located in the head (Ph) versus the body/tail (Pbt) in patients who received neoadjuvant chemoradiotherapy (NACRT) before surgery.
  • It included 107 patients who underwent surgery after NACRT, finding that the Ph group had lower albumin levels and worse immune markers compared to the Pbt group, which had higher rates of certain types of cancer spread.
  • Although the overall and recurrence-free survival rates were similar for both groups, the Pbt group had a significantly higher risk of recurrence via peritoneal dissemination.
View Article and Find Full Text PDF

Background/aim: Galectin-9 (Gal-9) induces tumor cell apoptosis in lymphoma and other malignant cell types. Duodenal adenocarcinoma is a rare malignancy, and there are insufficient data to determine a standard therapeutic approach. Here, we investigated the antitumor effect of Gal-9 in HuTu-80 duodenal adenocarcinoma cells.

View Article and Find Full Text PDF
Article Synopsis
  • * His symptoms included persistent pain and jaundice, leading to a series of imaging tests that identified a large tumor in the liver and issues with the bile ducts.
  • * Advanced techniques like endoscopic ultrasound and peroral cholangioscopy were used to accurately assess the tumor's invasion, allowing for a successful surgical treatment without extending to critical areas of the liver.
View Article and Find Full Text PDF
Article Synopsis
  • This study examined the potential of the biomarker M2BPGi for assessing liver fibrosis in pediatric patients who have undergone liver transplantation, addressing a need for noninvasive markers.
  • Researchers analyzed data from 96 pediatric liver transplant patients and found that M2BPGi levels showed some correlation with other fibrosis markers but did not significantly predict liver graft fibrosis.
  • The findings suggest that M2BPGi has limitations as an assessment tool for liver graft fibrosis, highlighting the need for further research with larger patient groups.
View Article and Find Full Text PDF
Article Synopsis
  • - The study examines how mechanical perfusion impacts hepatocytes (liver cells) sourced from livers after cardiac arrest, which could help address donor shortages for liver transplants.
  • - Researchers compared hepatocytes from livers after 30 minutes of warm ischemia (lack of blood flow) to those that underwent mechanical perfusion before isolation, finding that perfusion increased cell yield and improved energy status.
  • - Despite 30 minutes of warm ischemia reducing cell yield, the function of hepatocytes remained effective, suggesting that cardiac arrest donor livers could be viable for transplantation if cell yields are enhanced through mechanical perfusion.
View Article and Find Full Text PDF

A 40-year-old woman visited our hospital with a several-year history of right hypochondriac pain and vomiting after eating. She had been treated for functional dyspepsia, with no improvement in her symptoms. No gallstones were detected on imaging tests, but papillary insufficiency or dyskinesia of the gallbladder was suspected and biliary scintigraphy was performed.

View Article and Find Full Text PDF

Background: Pancreatic ductal adenocarcinoma (PDAC) is the most devastating of all cancers with an extremely poor prognosis. It has few effective and reliable therapeutic strategies. Telmisartan, a widely used antihypertensive drug, is an angiotensin II type 1 (AT1) receptor blocker (ARB).

View Article and Find Full Text PDF

Background/aim: Anti-inflammatory drugs, such as aspirin, have attracted attention as anticancer agents that can be applied to standard chemotherapy for pancreatic cancer. This study aimed to examine the antitumour effects and possible fundamental mechanisms of aspirin in pancreatic cancer cells.

Materials And Methods: We appraised the antitumour effects of aspirin on cell proliferation and tumour growth, cell cycle distribution, apoptosis, signalling pathways, angiogenesis-related proteins, and phosphorylated receptor tyrosine kinases (p-RTKs) and identify miRNAs associated with its antitumour effects.

View Article and Find Full Text PDF

Background: Hepatocyte transplantation is expected to be an alternative therapy to liver transplantation; however, poor engraftment is a severe obstacle to be overcome. The adipose tissue-derived stem cells (ADSCs) are known to improve engraftment of transplanted pancreatic islets, which have many similarities to the hepatocytes. Therefore, we examined the effects and underlying mechanisms of ADSC cotransplantation on hepatocyte engraftment.

View Article and Find Full Text PDF

Clinical hepatocyte transplantation (HTx) is only performed without general anesthesia, while inhalation anesthetics are usually used in animal experiments. We hypothesized that isoflurane may be a possible reason for the discrepancy between the results of animal experiments and the clinical outcomes of HTx. Syngeneic rat hepatocytes (1.

View Article and Find Full Text PDF

Background/aim: The promoter region of the telomerase reverse transcriptase (TERT) gene is a regulatory element capable of affecting TERT expression, telomerase activity, and telomerase length. Mutations within the TERT promoter region are the most common mutations in many cancers. In this study, we characterized the TERT promoter mutation status in hepatobiliary, pancreatic, and gastrointestinal cancer cell lines.

View Article and Find Full Text PDF

EB-TACE has recently been performed because of its lower hepatotoxicity compared to cTACE in less advanced HCC. However, local recurrence at the tumor margins is often observed after DEB-TACE. cTACE involves filling the intratumoral sinusoids with lipiodol-containing anticancer drugs and accumulating in the drainage area, which is the first site of HCC recurrence.

View Article and Find Full Text PDF

Intraportal injection is regarded as the current standard procedure of hepatocyte transplantation (HTx). In islet transplantation, which shares many aspects with HTx, recent studies have clarified that instant blood-mediated inflammatory reaction (IBMIR), characterized by strong innate immune responses, can cause poor engraftment, so other transplant sites to avoid such a reaction have been established. Although IBMIR was reported to occur in HTx, few reports have evaluated alternative transplant sites for HTx.

View Article and Find Full Text PDF

Highlight Kamada and colleagues devised a new technique for effective endoscopic papillary large balloon dilation without high balloon pressure. Advantages of the technique include the prevention of unintentional over-pressurization of the balloon by limiting the balloon inflation pressure and reduced risk of pancreatitis due to continuous pancreatic duct obstruction.

View Article and Find Full Text PDF

Background: While neoadjuvant chemotherapy and chemoradiotherapy (NACRT) for pancreatic head cancer are effective, preoperative endoscopic biliary drainage (EBD) is necessary for managing obstructive jaundice and cholangitis during the preoperative waiting period. Nevertheless, ideal choice of stent type is unclear. We compared plastic stents (PS) and metal stents (MS) in these situations.

View Article and Find Full Text PDF

Background/aim: Gemcitabine, an inhibitor of DNA synthesis, is the gold standard chemotherapeutic agent for pancreatic ductal adenocarcinoma (PDAC). MicroRNAs (miRNAs) play critical roles in cancers, including PDAC. However, less is known about the effect of gemcitabine on PDAC cells and miRNA expression in PDAC.

View Article and Find Full Text PDF

Gastric cancer is one of the most common malignancies diagnosed worldwide. Telmisartan, an angiotensin receptor blocker (ARB), suppresses the proliferation of cancer cells and the growth of tumors through an unknown mechanism. To identify the mechanism, the present study was designed to evaluate the effects of telmisartan on gastric cancer cell lines and tumors in vitro and in vivo and the associated signaling molecules were identified.

View Article and Find Full Text PDF

Background/aim: Pancreatic neuroendocrine tumors (pNETs) are rare pancreatic neoplasms, and therapeutic options for pNETs are limited. Metformin is an anti-hypoglycemic drug that appears to have anticancer effects. However, little is known about the effect of metformin on pNETs.

View Article and Find Full Text PDF

Gallbladder cancer is the most common biliary tract cancer with poor prognosis and wide variation in incidence rates worldwide, being very high in some countries in Latin America and Asia. Treatment of type 2 diabetes with metformin causes a reduction in the incidence of cancer. Till date, there are no reports on the anti-tumor effects of metformin in gall bladder cancer.

View Article and Find Full Text PDF