Publications by authors named "Hiroaki Tsuchiya"

Background: An observational post-marketing surveillance (PMS) is being conducted to evaluate the long-term safety and effectiveness of bedaquiline as part of combination therapies in treating pulmonary multidrug-resistant tuberculosis (MDR-TB) in Japan.

Methods: This interim analysis includes patients with MDR-TB who started bedaquiline-containing anti-tuberculosis (TB) drugs in Japan between January 2018 and September 2022. Outcomes include the incidence of adverse drug reactions (ADRs) and negative sputum cultures.

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Advanced/metastatic urothelial cancer (a/m UC) still has a poor prognosis despite the recent medical advances. Recent studies demonstrated that fibroblast growth factor receptor (FGFR) gene alterations (GAs) may be driver genes for UC; however, the proportion of UC genetic panel testing in Japan remains low. We clarified the proportion of patients with FGFR2/3 GAs, treatment patterns, and clinical outcomes in a/m UC patients in Japan.

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Introduction: Patients with inflammatory bowel disease (IBD) are increasingly using online platforms to communicate with other patients and healthcare professionals seeking disease-related information and support. Free-text posts on these platforms could provide insights into patients' everyday lives, which could help improve patient care. In this proof-of-concept (POC) study, we applied text mining to extract patient needs from free-text posts on a community forum in Japan, holistically visualized the patients' perceptions and their connections, and explored the patient characteristic-dependent trends in the use of words.

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In this study, we evaluated the drug release behavior of diameter customized TiO nanotube layers fabricated by anodization with various applied voltage sequences: conventional constant applied potentials of 20 V (45 nm) and 60 V (80 nm), a 20/60 V stepped potential (50 nm [two-diameter]), and a 20-60 V swept potential (49 nm [full-tapered]) (values in parentheses indicate the inner tube diameter at the top part of nanotube layers). The structures of the 50 nm (two-diameter) and 49 nm (full-tapered) samples had smaller inner diameters at the top part of nanotube layers than that of the 80 nm sample, while the outer diameters at the bottom part of nanotube layers were almost the same size as the 80 nm sample. The 80 nm sample, which had the largest nanotube diameter and length, exhibited the greatest burst release, followed by the 50 nm (two-diameter), 49 nm (full-tapered), and 45 nm samples.

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Article Synopsis
  • Crohn's disease (CD) is a painful gastrointestinal condition that can lead to complex issues like perianal disease, and this study examines the effects of ustekinumab (UST) over a year in treating this.
  • The analysis included 341 patients, focusing on safety and effectiveness, comparing those with and without perianal issues and measuring adverse drug reactions (ADR), clinical remission, and changes in disease activity scores.
  • Results indicated that UST was both safe and effective for all patients, showing improvement in perianal symptoms regardless of previous biologic treatments, with no significant difference in ADR or clinical outcomes between the two groups.
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Objectives: Our objective was to assess the efficacy of golimumab (GLM) in patients with poor prognostic factors (PPFs).

Methods: This is a post hoc analysis of GO-FORTH Phase 2/3 study. Cluster analysis was used to determine a patient population with high-risk patterns based on seven PPFs suggested by the European Alliance of Associations for Rheumatology recommendations and limited physical function.

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  • A 52-week study assessed the safety and effectiveness of guselkumab, a monoclonal antibody used to treat various forms of psoriasis in Japanese patients, with reported results from a 20-week interim analysis.
  • Out of 411 patients analyzed for safety, 6.6% experienced adverse drug reactions (ADRs), with the most common being infections, while 2.2% had serious ADRs.
  • Improvements in psoriasis severity were significant, with scores dropping from 11.6 at baseline to 2.2 by week 20, highlighting guselkumab's tolerability and effectiveness in real-world settings.
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  • A study investigated the effect of different initial doses of oral corticosteroids (OCS) on the incidence of pneumonia in patients with ulcerative colitis (UC), noting that many physicians prescribe lower doses due to infection concerns.
  • Using data from the Japan Medical Data Center, researchers created a matched cohort of UC patients and found no significant differences in pneumonia rates among patients receiving lower (under 30 mg), guideline-recommended (30-40 mg), and higher doses (> 40 mg) of OCS.
  • Overall, the study concluded that pneumonia incidence, including Pneumocystis jirovecii pneumonia (PJP), was low across all OCS dosing groups, despite identifying certain risk factors
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  • Docetaxel is a standard therapy for patients with advanced non-small cell lung cancer (NSCLC) after receiving osimertinib and platinum-based chemotherapy, and this study aims to assess the outcomes of post-treatment therapies.
  • Data was collected from 731 patients who had NSCLC and were treated with various therapies after osimertinib and platinum-based chemotherapy between 2008 and 2021, focusing on the duration of treatment and overall survival rates.
  • Results showed that docetaxel-based therapy had a median duration of treatment of 3.8 months and median overall survival of 10 months, while immune checkpoint inhibitors had the shortest treatment duration (2.77 months) and overall survival (7.07 months
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Background: To present the real-world evidence on the safety and effectiveness of ustekinumab (UST) through 52-week treatment for Crohn's disease (CD) under an analysis of post-market surveillance data in Japan.

Methods: This prospective, post-marketing surveillance study was conducted in 341 patients from 91 medical facilities in Japan. Patients received UST 90 mg injected subcutaneously once every 12 weeks (or every 8 weeks if patients show weak effectiveness) after an induction dose given intravenously.

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The band structures and band gap energies, , of passive films formed on titanium (Ti) in simulated bioliquids, Hanks' solution (Hanks) and saline, were evaluated. Ti was polarized at 0, -0.1, and -0.

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Background/aims: Golimumab (GLM) is an anti-tumor necrosis factor-α drug approved for treating moderate-to-severe active ulcerative colitis (UC). A 52-week post-marketing surveillance (PMS) was initiated to evaluate its safety and effectiveness in patients with UC in Japan. We present an interim report of the ongoing PMS.

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Article Synopsis
  • Ustekinumab, an anti-interleukin-12/23 monoclonal antibody, was studied for its safety and effectiveness in treating Crohn's disease in Japan, with data collected from May 2017 to June 2020 across 91 medical centers.
  • The study involved 341 patients, showing low rates of adverse drug reactions (5.3%) and serious adverse reactions (2.1%), with worsening of Crohn's disease being the most common issue.
  • At 8 weeks, 40% of patients showed clinical response and 48.5% achieved clinical remission, along with significant improvement in disease activity scores; overall, the therapy was deemed effective and safe without new safety concerns.
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Anodic TiO nanotubes that are grown on Ti substrates by a simple anodization in various types of fluoride containing electrolytes have attracted scientific and technological interest due to their wide potential applications, and therefore, numerous research efforts have been dedicated to these self-ordered oxide structures in the past decade. The present mini-review highlights less known but important aspects, such as the formation of spaced nanotubes with adjustable interspacing that is achieved in a few specific organic electrolytes, and strong effects of the metallic Ti substrate which significantly affect the growth of the tubes. We discuss the formation of oxide nanotubes grown from adequately alloyed substrates and noble metal nanoparticle decoration of tubes.

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  • * This process uses a titanium substrate with small amounts of Au and Pt, which forms nanoparticles at the oxide/metal interface as the nanotubes grow.
  • * The resulting AuPt alloy nanoparticles significantly enhance photocatalytic hydrogen generation, producing 12.04 μL of H per hour under solar light, outperforming TiO nanotubes with only Au or Pt.
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  • - Low-dose nitrogen implantation in TiO2 nanotubes creates a specific ion and damage profile that enhances their ability to catalyze hydrogen production without using noble metals.
  • - This ion implantation process focuses on the upper portion of the nanotubes, leading to the formation of an active zone that boosts photocatalytic activity.
  • - The combination of the modified top layer and the original non-implanted section of the nanotubes improves carrier separation, resulting in a notable increase in hydrogen generation efficiency.
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The present study reports the corrosion fatigue of the Ti-6Al-4V alloy using cyclic deformation test in a simulated body fluid under cell culturing for the first time. Cyclic deformation tests were carried out using three types of specimens to reveal the effects of proteins and cells on the corrosion fatigue of the alloy. For the 1-day-immersed and 1-week-immersed specimens, tensile specimens were soaked in a simulated body fluid for 1 day and 1 week, respectively, before cyclic deformation test, whereas for the cell-cultured specimen, MC3T3-E1 osteoblast-like cells were seeded and then cultured on tensile specimens for 1 week.

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Aligned CoF2 nanochannel layers have been formed by self-ordering electrochemical anodization. In voltammograms these layers provide multiple oxidation states, an almost ideal rectangular pseudocapacitive behavior, a high specific capacitance and good capacitance retention. These layers may thus be promising for supercapacitor applications.

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  • - The study explored how the time adhesive is applied affects the bond strength to enamel for different self-etch adhesives (Bond Force, Clearfil tri-S Bond, iBond Self-Etch, and OptiBond All-in-One).
  • - Bovine teeth were prepared and adhesives were tested at application times of 10, 20, and 40 seconds, with bond strength measured after 24 hours of storage.
  • - Results showed that longer application times (40 seconds) improved bond strength for most adhesives, but no significant change was noted for iBond; also, some adhesives showed altered surface roughness after 40 seconds.
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Self-organized TiO(2)-MoO(3) composite oxide nano-tubes with tunable dimensions are successfully fabricated by anodization of a Ti-Mo alloy and these nano-tube layers exhibit a significantly enhanced electrochromic color contrast compared with plain TiO(2) nano-tubes.

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  • * The adhesives showed optimal bond strength (10.4-17.0 MPa) in standard room conditions, while lower RH conditions resulted in weaker bonds (6.8-12.0 MPa) and more interface failures.
  • * Results suggest orthodontic adhesive systems need careful handling in various oral environmental conditions to ensure effective bonding.
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The purpose of this study was to examine the microtensile bond strength of a single-step self-etch adhesive system (Clearfil tri-S Bond and One-Up Bond F Plus) to bovine dentin. Adhesive was applied to a flat dentin surface, and resin composite was bonded according to the manufacturers' instructions. After 24 h storage in distilled water at 37 degrees C, hourglass-shaped specimens were produced.

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  • - The study focuses on how hydroxyapatite formation varies on different layers of titanium dioxide (TiO2) nanotubes, created through electrochemical anodization in fluoride electrolytes.
  • - Researchers tested nanotube layers of varying thickness (2 mum and 500 nm) and compared them to compact anodic TiO2 layers using methods like immersion tests, SEM, XRD, and FT-IR.
  • - Results indicate that titanium surfaces with nanotubes enhance hydroxyapatite formation, with the 2-mum thick nanotube layer promoting faster deposition, particularly when the tubes are annealed to anatase or a mix of anatase and rutile.
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