Publications by authors named "Tomoyuki Yamada"

Background: The implementation of cancer precision medicine in Japan is deeply intertwined with insurance reimbursement policies and requires case-by-case reviews by Molecular Tumor Boards (MTBs), which impose considerable operational burdens on healthcare facilities. The extensive preparation and review times required by MTBs hinder their ability to efficiently assess comprehensive genomic profiling (CGP) test results. Despite attempts to optimize MTB operations, significant challenges remain.

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Daptomycin, an anti-methicillin-resistant Staphylococcus aureus drug, causes exposure-dependent muscle toxicity and eosinophilic pneumonia. Although the area under the concentration-time curve (AUC)-guided dosing is crucial, an optimal blood sampling strategy is lacking. This study aimed to identify an optimal limited sampling strategy using Bayesian forecasting to rapidly achieve the target AUC.

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  • Flutamide and bicalutamide, two nonsteroidal anti-androgens, are linked to a higher risk of liver injury compared to other similar medications like enzalutamide, apalutamide, and darolutamide.
  • A study analyzed data from over 142,000 male patients and found that steroid use significantly reduced the risk of liver injury from these drugs, with odds ratios indicating a protective effect.
  • The findings suggest that while flutamide and bicalutamide pose a risk for liver injury, the concurrent use of steroids may alleviate some of this risk, highlighting a potential management strategy.
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  • The study investigates the relationship between amenamevir, a new anti-herpesvirus drug, and the risk of encephalopathy, a potential complication during herpes zoster treatment.
  • Using data from the Japanese Adverse Drug Event Report (JADER) database, the researchers identified 246 patients treated with amenamevir and found a significant association between the drug and encephalopathy, with older age being a key risk factor.
  • The findings highlight the need for healthcare providers to monitor elderly patients (especially those aged 70 and above) closely for signs of encephalopathy when prescribing amenamevir.
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Aims: Amikacin requires therapeutic drug monitoring for optimum efficacy; however, the optimal model-informed precision dosing strategy for the area under the concentration-time curve (AUC) of amikacin is uncertain. This simulation study aimed to determine the efficient blood sampling points using the Bayesian forecasting approach for early achievement of the target AUC range for amikacin in critically ill patients.

Methods: We generated a virtual population of 3000 individuals using 2 validated population pharmacokinetic models identified using a systematic literature search.

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In this study, we aimed to evaluate limited sampling strategies for achieving the therapeutic ranges of the area under the concentration-time curve (AUC) of vancomycin on the first and second day (AUC , AUC , respectively) of therapy. A virtual population of 1000 individuals was created using a population pharmacokinetic (PopPK) model, which was validated and incorporated into our model-informed precision dosing tool. The results were evaluated using six additional PopPK models selected based on a study design of prospective or retrospective data collection with sufficient concentrations.

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Flutamide is a non-steroidal anti-androgen agent, which is mainly used for the treatment of prostate cancer. Flutamide is known to cause severe adverse events, which includes idiosyncratic liver injury. However, details of the mechanism of these adverse reactions have not been elucidated.

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Background: Postoperative atrial fibrillation (POAF) after open-heart surgery is a non-negligible complication. We aimed to describe the efficacy of a transdermal patch of bisoprolol for managing POAF and flutter in thoracic surgical procedures.

Methods: We analyzed the data of 384 patients who underwent open-heart surgery at our hospital and received oral bisoprolol to prevent POAF.

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Teicoplanin, a glycopeptide antimicrobial, is recommended for therapeutic drug monitoring, but it remains unclear how to target the area under the concentration-time curve (AUC). This simulation study purposed to demonstrate the potential of the Bayesian forecasting approach for the rapid achievement of the target AUC for teicoplanin. We generated concordant and discordant virtual populations against a Japanese population pharmacokinetic model.

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  • The study investigates life expectancy after aortic valve replacement (AVR) in patients with severe aortic stenosis (AS), highlighting a lack of existing data on this topic.
  • Data from 3815 patients in the CURRENT AS registry revealed that those who underwent AVR had better survival rates than those using a conservative treatment strategy, especially among younger patients.
  • The findings suggest that assessing surgical risk based on age and STS score can help estimate life expectancy post-AVR, which is crucial for deciding between surgical and transcatheter approaches.
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Community-acquired pneumonia (CAP) caused by in healthy adults can rapidly lead to severe outcomes. We treated a case of -induced CAP and concurrent severe coronavirus disease (COVID-19) in a healthy 39-year-old man without other serious risk factors for severe illness except smoking. Immediately after admission, the patient developed sepsis and received intensive broad-spectrum antibacterial therapy with meropenem and vancomycin, veno-arterial extracorporeal membrane oxygenation (VAECMO), and catecholamine supplementation.

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Background: Although acetaminophen is recommended for the treatment of mild-to-moderate cancer pain, acetaminophen-induced hepatic disorders pose an important clinical challenge. Concomitant prescription of immune checkpoint inhibitors (ICIs) may further increase the risk of hepatic disorders in patients taking acetaminophen; however, there are few clinical studies that confirm this.

Aim: To evaluate the risk of hepatic disorders in patients taking concomitant acetaminophen and ICIs using a disproportionality analysis from the Japanese Adverse Drug Event Report database.

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Objective: Using a prospective observational design, we assessed adverse events (AEs) after COVID-19 vaccination in Japanese patients.

Methods: Two doses of the mRNA-1273 (SPIKEVAX®) or BNT162b2 (COMIRNATY®) vaccine were administered to participants aged 12 to 18 years, and AEs after each dose were recorded for 14 days. Data on the duration and nature (local vs.

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  • * Traditional methods to adjust bandgap, such as gating and strain, have limited effectiveness, typically allowing changes of about 0.1 eV, while alloying TMDCs offers a more effective solution with variable bandgap properties.
  • * The researchers created a color-tunable light-emitting device using a WS/WSe alloy, which allows for a variable light-emission energy range and enables continuous color tuning by adjusting the recombination zone, paving the way for broader optical applications.
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Massive pulmonary artery aneurysms, while extremely rare, might require surgical intervention. Most previous cases have been repaired either by pulmonary artery plication or synthetic graft replacement. We report a case of massive pulmonary artery aneurysm that was successfully repaired using an 'overlapping-plasty' technique with the help of 3D image simulation.

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Introduction: Venous ulcers are often intractable.

Objective: The aim of this study was to retrospectively analyze the effectiveness of endovenous ablation, compression therapy, moist wound healing, and skin care in the management of venous ulcers.

Materials And Methods: Twenty-eight consecutive patients (10 male, 18 female; mean age, 70.

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Background: The profile of ceftriaxone-induced encephalopathy is not well understood.

Aim: To identify risk factors associated with ceftriaxone-induced encephalopathy.

Method: In this observational study, anonymised patient data were retrieved from the open-access Japanese Adverse Drug Event Report database for ceftriaxone users aged 20 years or higher.

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  • The study focuses on using deep learning to predict genetic abnormalities in cancer from tissue images, aiming to enhance rapid decision-making for targeted therapies.
  • Researchers analyzed 1,657 images of tumor samples to develop models that could accurately predict mutations and other genetic markers relevant to colorectal cancer treatment.
  • Results demonstrated high accuracy in predicting these genetic abnormalities, suggesting that advanced pathology techniques could potentially replace traditional genetic testing methods in the future.
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Although early transition from intravenous to oral antimicrobials can reduce hospitalization duration, susceptibility breakpoints have not been established for many oral antimicrobials against Escherichia coli and Klebsiella pneumoniae bacteremia. Thus, we used population pharmacokinetic models, pharmacokinetic/pharmacodynamic indices, and Monte Carlo simulations to evaluate the probability of target attainment (PTA) for common oral antimicrobial dosages against E. coli and K.

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Objectives: Whether incompetent perforator veins (IPVs) require treatment remains controversial. We retrospectively evaluated the feasibility of IPV excision performed using the stab avulsion technique without ligation and sutures in patients undergoing endovenous ablation (EA).

Methods: This was a single-center, retrospective, observational cohort study.

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Background: Inappropriate blood collection subjected to blood culture (BC) causes BC contamination and may complicate the diagnose is of infectious diseases. Therefore, we developed a bundle based on the guideline recommendations for appropriate blood collection and examined the effects of bundle introduction.

Methods: We performed a retrospective analysis of BC samples to determine the contamination rates before and after introducing the BC bundle.

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Pregabalin is a first-line treatment option for neuropathic pain. Recently, some cases of pregabalin-induced hypoglycemia have been reported, which can complicate the treatment of neuropathic pain and worsen patient outcomes. Therefore, a better understanding of the clinical condition of patients with pregabalin-induced hypoglycemia is desirable.

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Portal circle.

J Hepatobiliary Pancreat Sci

March 2022

Highlight A 51-year-old man was referred for further evaluation of a hepatic anomaly detected on abdominal ultrasonography. Contrast-enhanced computed tomography showed an extremely rare portal venous anomaly, almost like a 'portal circle'. Ataka and colleagues present the first report of this type of anomaly and describe it from an embryological perspective.

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Background: This study aimed to determine whether disease severity varied according to whether coronavirus disease 2019 (COVID-19) patients had multiple or single cardiovascular diseases and risk factors (CVDRFs).

Methods and results: COVID-19 patients with single (n=281) or multiple (n=412) CVDRFs were included retrospectively. Multivariable logistic regression showed no significant difference in the risk of in-hospital death between groups, but patients with multiple CVDRFs had a significantly higher risk of acute respiratory distress syndrome (odds ratio: 1.

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