Publications by authors named "Masataka Matsumoto"
Copper oxide high-temperature superconductors, such as BiSrCaCuO (Bi2212), have garnered extensive research interest due to their high critical temperatures (T) surpassing the Bardeen-Cooper-Schrieffer (BCS) limit. The two-dimensional CuO₂ plane is widely regarded as the most crucial element of high-T cuprate superconductors. The anisotropy of this CuO₂ layer remains a topic of ongoing interest.
View Article and Find Full Text PDFObjectives: The combination of chemotherapy and immune checkpoint inhibitors (chemo-ICI) has become the new standard of treatment for extensive-stage small cell lung cancer (ES-SCLC). Recently, slight changes in interstitial shadows, defined as interstitial lung abnormalities (ILA), have been identified. In patients with ES-SCLC who received chemo-ICI, there are limited data on the incidence of drug-induced interstitial lung disease (D-ILD) in daily practice and the association between the development of D-ILD and ILA in the baseline computed tomography (CT).
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- This study investigates how total gastrectomy for gastric cancer affects both the size of the pancreas and its ability to function properly.
- Researchers found that pancreatic volume decreases continuously after surgery, particularly after total gastrectomy, while it remains unchanged after other types of surgery.
- Additionally, both exocrine (digestive) and endocrine (hormonal) functions of the pancreas were found to decline significantly after total gastrectomy, indicating a link between reduced pancreatic volume and decreased functionality.
Article Synopsis
- A 77-year-old Japanese man developed worsening cough and lung opacities after taking an over-the-counter cold medicine daily for 25 years.
- A lung biopsy indicated an organizing pneumonia pattern, leading to a diagnosis of drug-induced interstitial lung disease.
- Upon stopping the cold medicine, his symptoms improved, highlighting the need to consider long-term use of over-the-counter drugs as a potential cause of lung issues.
Background: Complex hepatocellular carcinoma (HCC) prognostic biomarkers have been reported in various studies. We aimed to establish biomarkers that could predict prognosis, and formulate a simple classification using non-invasive preoperative blood test data.
Methods: We retrospectively identified 305 patients for a discovery cohort who had undergone HCC-related hepatectomy at four Japanese university hospitals between January 1, 2011 and December 31, 2013.
Backgrounds: Liver resection for hepatocellular carcinoma (HCC) in patients with Child-Pugh class (CPC) B increases the incidence of postoperative complication and in-hospital death and decreases the disease-free survival (DFS) and overall survival (OS) compared with those with CPC A. Conversely, some selected patients possibly gained benefits for liver resection.
Methods: Clinical records of 114 patients with CPC B who underwent liver resection for HCC were retrospectively reviewed.
Objective: This multicenter study aimed to compare the short- and long-term outcomes of laparoscopic (LRLR) versus open repeat liver resection (ORLR) for recurrent hepatocellular carcinoma (HCC) using propensity score matching (PSM). Despite the expanding indications for laparoscopic liver resection, limited data regarding the outcomes of LRLR have previously been reported.
Methods: This study included patients who underwent repeat liver resection for recurrent HCC.
Aim: Pancreaticodigestive tract anastomotic stricture is a long-term complication of pancreticoduodenectomy (PD). However, optimal treatment has not yet been defined. We conducted longitudinal pancreaticojejunostomy (LPJ) in symptomatic patients with anastomotic stricture after PD.
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- The study investigated risk factors for severe complications in patients undergoing laparoscopic liver surgery for tumors in specific liver segments from 2009 to 2019.
- Key findings indicated that a tumor size of 3 cm or more, segmentectomy, and liver cirrhosis significantly increased the risk of complications after surgery.
- Patients without these risk factors experienced lower complication rates, less blood loss, shorter surgery times, and shorter hospital stays, suggesting they are better candidates for this type of surgery.
Background: Laparoscopic liver resection for hepatic lesions is increasingly performed worldwide. However, parenchyma-sparing laparoscopic liver resection for hepatic lesions in the right posterosuperior segments is very technically demanding. This study aimed to compare postoperative outcomes between patients undergoing laparoscopic liver resection and open liver resection for hepatic lesions in the right posterosuperior segments.
View Article and Find Full Text PDFBackground: Synchronous colorectal liver metastasis (SCRLM) is at an advanced tumor stage and requires multidisciplinary treatments. Neoadjuvant chemotherapy (NAC) is thought to be an effective treatment modality, but its prognostic impact is still unclear.
Materials And Methods: Patients with resectable SCRLM presented to eight university hospitals between 2007 and 2017 were retrospectively reviewed.
Purpose: Postoperative pancreatic fistula (POPF) remains the most clinically relevant complication of laparoscopic distal pancreatectomy (LDP). The present study evaluated the efficacy of the "slow firing method" using a reinforced triple-row stapler (Covidien, Tokyo, Japan) during LDP.
Methods: This retrospective single-center study included 73 consecutive patients who underwent LDP using the slow firing method.
Background: Xeroderma pigmentosum is a rare, autosomal-recessive photosensitive dermatosis. Patients with xeroderma pigmentosum have an impaired ability to repair deoxyribonucleic acid damage caused by ultraviolet rays, resulting in skin cancer. Patients with xeroderma pigmentosum are more susceptible to some cancers.
View Article and Find Full Text PDFSurgical treatment for chronic pancreatitis: A single-center retrospective study in Japan.
J Hepatobiliary Pancreat Sci
September 2020
Background/purpose: To determine the short- and long-term results of surgical treatments for chronic pancreatitis (CP) at a high-volume center in Japan.
Methods: The records of 151 consecutive patients undergoing surgery for CP were retrospectively reviewed. Selection of surgical procedures used had been according to the Japanese Clinical Practice Guidelines for CP 2015.
Article Synopsis
- This study aimed to identify factors that lead to converting laparoscopic distal pancreatectomy to open surgery and assess how this conversion affects patient outcomes.
- Among 70 patients, 10% required conversion, primarily due to pancreatic ductal adenocarcinoma (PDAC) and technical difficulties.
- Despite similar complications between converted and non-converted cases, patients who underwent conversion had a longer hospital stay, highlighting the need for better preoperative assessments for those undergoing LDP for PDAC.
Article Synopsis
- A new tricritical point has been identified in nonequilibrium steady states using the AdS/CFT correspondence, focusing on a (3+1)-dimensional strongly coupled large-N_{c} gauge theory.
- This tricritical point is linked to chiral symmetry breaking when an electric current and magnetic field are applied.
- The critical exponents observed align with those predicted by Landau's theory of equilibrium phase transitions, indicating a potential connection to a Landau-like framework in the realm of nonequilibrium transitions.
Article Synopsis
- A 62-year-old woman with severe anemia and shortness of breath was diagnosed with duodenal cancer and bleeding tumors after gastrointestinal endoscopy.
- A CT scan showed multiple liver metastases, and her hemoglobin levels dropped dangerously low overnight, prompting emergency surgery (pancreaticoduodenectomy) to stop the bleeding.
- Although the patient had a smooth recovery from surgery and started chemotherapy later, she ultimately passed away from the disease 13 months post-surgery.
Objectives: Early death in severe acute pancreatitis (SAP) is caused by pancreatic necrosis and multiple-organ failure due to microcirculation disorder. The aim of this study was to prove that recombinant human-soluble thrombomodulin (rTM) has therapeutic effects on SAP by preventing pancreatic necrosis and organ failure.
Methods: Male Wister rats were used.
Background: Postoperative pancreatic fistula (POPF) after distal pancreatectomy (DP) remains the most common surgical complication. We have developed a novel stump closure technique after DP using transpancreatic mattress suture with Vicryl mesh (TMV) and reported our initial findings. The purpose of this study is to evaluate the efficacy of TMV compared to the conventional handsewn stump closure technique (CHS).
View Article and Find Full Text PDFIntroduction: Aberrant subvesical bile ducts are rare structural anomaly located in the peri-hepatic gallbladder fossa. This duct poses the risk for intraoperative bile duct injury resulting in clinically relevant bile leakage.
Presentation Of Case: Aberrant subvesical bile duct was detected by preoperative magnetic resonance cholangiopancreatography in a 52-year old woman with gallbladder polypoid tumor harboring the risk to be gallbladder cancer.
Background: The frequency of liver resection in elderly patients has been increasing. However, data are limited regarding the safety of laparoscopic liver resection (LLR) compared with that of open liver resection (OLR) for hepatocellular carcinoma (HCC) in elderly patients. The present study aimed to compare short-term outcomes between LLR and OLR in elderly patients with HCC using propensity score matching.
View Article and Find Full Text PDFPurpose: The purpose of the study was to compare the outcomes of laparoscopic distal pancreatectomy (LDP) and open distal pancreatectomy (ODP) for benign and low-grade malignant lesions to determine the safety and efficacy of LDP.
Methods: This retrospective comparative study included 67 consecutive patients who underwent LDP (n = 32) and ODP (n = 35) for benign or low-grade malignant lesions of the pancreas from January 2012 to March 2017. Thirty-five patients who were eligible for LDP in the ODP group were carefully selected.
Article Synopsis
- Researchers have identified myosin heavy chain 11 (myosin-11) as a smooth muscle cell-specific biomarker for abdominal aortic aneurysm (AAA) by studying proteins secreted from aneurysmal tissue collected from patients.* -
- Elevated circulating levels of myosin-11 in patients with AAA were found to be significantly higher than those in healthy controls, indicating its potential as a screening tool.* -
- The study also showed a strong correlation between myosin-11 levels and aortic diameter, suggesting it could help assess the severity of AAA and improve screening when combined with other risk factors like hypertension.*
Article Synopsis
- A 67-year-old woman with advanced Stage IV pancreatic cancer received S-1 chemotherapy after her condition worsened, showing tumor invasion and distant metastases.
- Following two courses of chemotherapy, her tumor marker levels dropped to normal, and imaging showed significant tumor reduction with no detectable metastases.
- Eight months later, she had successful surgery with no cancer cells found in the tumor or lymph nodes, and remained cancer-free for 10 months post-operation.
Article Synopsis
- Respiratory medicine physicians often prescribe various medications based on patient needs, and a study was conducted to evaluate an outside pharmacy's effectiveness in fulfilling these prescriptions from November 2015 to January 2016.
- Out of 330 patients, 298 responded to a questionnaire, revealing that most patients preferred the pharmacy near the hospital, but some experienced delays in receiving their medications.
- Although there were significant stock shortages of inhalers in both pharmacies, most patients who faced delays still managed to obtain their medications within 1-2 days without any observed negative effects on their health.