Publications by authors named "Keita Kobayashi"

The introduction of machine learned potentials (MLPs) has greatly expanded the space available for studying Nuclear Quantum Effects computationally with ab initio path integral (PI) accuracy, with the MLPs' promise of an accuracy comparable to that of ab initio at a fraction of the cost. One of the challenges in development of MLPs is the need for a large and diverse training set calculated by ab initio methods. This dataset should ideally cover the entire phase space, while not searching this space using ab initio methods, as this would be counterproductive and generally intractable with respect to computational time.

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Long noncoding RNAs (lncRNAs) serve pivotal roles in cancer biology. The present study investigated the oncogenic roles of lncRNAs in renal cell carcinoma (RCC) and their potential as prognostic biomarkers. The lncRNA leucine‑rich repeat containing 75 A‑antisense RNA1 (LRRC75A‑AS1) was identified through lncRNA microarray as a potential lncRNA that may predict the efficacy of immune checkpoint inhibitor therapy and cancer progression in RCC.

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Background: Bladder preservation therapy for muscle-invasive bladder cancer is reported to yield outcomes comparable to those of radical cystectomy, although it receives a relatively low recommendation grade in Japanese guidelines. This study aims to compare the outcomes of trimodal therapy versus radical cystectomy in the treatment of muscle-invasive bladder cancer.

Methods: This study is a single-center retrospective analysis that included patients treated with either trimodal therapy or radical cystectomy for muscle-invasive bladder cancer (cT2-4N0-2M0) at our institution between January 1998 and December 2022.

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  • The study aimed to improve predictions of castration resistance in advanced prostate cancer during primary androgen deprivation therapy (ADT) by combining genetic and clinical data using machine learning techniques.
  • Researchers utilized clinical data and single nucleotide polymorphisms (SNPs) from Japanese patients treated in the KYUCOG-1401-A study and tested multiple machine learning algorithms, finding that the point-wise linear (PWL) algorithm provided the best predictive performance.
  • Results indicated that models incorporating SNPs outperformed clinical data alone in predicting outcomes, showing promise for better treatment choices in advanced prostate cancer management.
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  • * Analyzing 378 patients, researchers identified significant factors linked to progression-free survival, including sarcomatoid features, Fuhrman grade 4, and the C-reactive protein-albumin-lymphocyte (CALLY) index.
  • * The findings suggest that the CALLY index is a strong predictor of postoperative recurrence, indicating that patients with a low CALLY index might benefit from additional treatment after surgery.
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Pancreatic cancer is the third leading cause of death related to cancer. The only possible cure presently is complete surgical resection; however, this is limited by difficulty in clearly defining tumor margins. Enhancement of the visualization of pancreatic ductal adenocarcinoma (PDAC) tumor margins using near-infrared dye-conjugated tumor-specific antibodies was pioneered by using anti-CEA, anti-CA19.

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Background: In Japan, the authorized period (2-4 h) between oral administration of 5-aminolevulinic acid hydrochloride (5-ALA) and transurethral resection for non-muscle invasive bladder cancer (NMIBC) may restrict photodynamic diagnosis (PDD) usage. Therefore, this prospective, single-arm, phase III study aimed to evaluate the diagnostic accuracy and safety of PDD at an extended administration period (4-8 h).

Methods: From January 2022 to May 2023, 161 patients with NMIBC were enrolled from eight hospitals.

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  • A study examined the effectiveness of avelumab and pembrolizumab, treatments for metastatic urothelial carcinoma post-chemotherapy, focusing on factors predicting patient outcomes.
  • The research included 243 patients, analyzing characteristics and blood data to identify independent prognostic factors like performance status and specific blood markers.
  • Findings indicate a new risk score utilizing platelet-to-lymphocyte ratio and lactate dehydrogenase levels could effectively predict overall survival after starting immune checkpoint inhibitors, outperforming existing models.
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  • A study examined the effectiveness of avelumab maintenance therapy compared to pembrolizumab in patients with metastatic and unresectable urothelial carcinoma after 4 cycles of chemotherapy without disease progression.
  • Data from 243 patients treated between January 2017 and December 2022 was analyzed, with a focus on oncological outcomes and adverse events using a method called propensity score matching.
  • The findings indicated that both avelumab and pembrolizumab had similar progression-free survival rates, but avelumab required a lower rate of high-dose glucocorticoid treatment.
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Objectives: In a primary analysis of data from the BRIGHT study (UMIN000035712), photodynamic diagnosis-assisted transurethral resection of bladder tumor (PDD-TURBT) using oral 5-aminolevulinic acid hydrochloride reduced residual tumors in high-risk non-muscle invasive bladder cancer (NMIBC). We aimed to evaluate the effectiveness of PDD-TURBT for intravesical recurrence after a second transurethral resection for high-risk NMIBC.

Methods: High-risk NMIBC patients initially treated with PDD-TURBT (PDD group) were prospectively registered between 2018 and 2020.

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  • The study investigates how a lack of methionine in the diet affects hair loss in mice and its relation to hair-follicle keratinocytes, which proliferate similarly to cancer cells.
  • Mice were divided into three groups: one group received a normal diet, another a methionine-deficient diet, and the last a methionine-deficient diet with homocysteine supplementation.
  • Results showed that only the return of methionine in the diet led to the resumption of hair growth after hair loss, indicating that methionine is crucial for hair maintenance.
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Background/aim: Colorectal cancer (CRC) is the third-leading cause of death in the world. Although the prognosis has improved due to improvement of chemotherapy, metastatic CRC is still a recalcitrant disease, with a 5-year survival of only 13%. Irinotecan (IRN) is used as first-line chemotherapy for patients with unresectable CRC.

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Objectives: The aim of this study was to compare clinical outcomes between patients receiving second TUR after initial white-light transurethral resection of bladder tumor (WL-TURBT) and initial photodynamic diagnosis (PDD)-assisted TURBT.

Methods: A total of 1007 patients were divided into four groups based on the treatment pattern: WL-TURBT with second TUR (161 patients, WL-second group) or without second TUR (540 patients, WL-alone group) and PDD-TURBT with second TUR (112 patients, PDD-second group) or without second TUR (194 patients, PDD-alone group). Oncologic outcomes (bladder cancer recurrence, progression, urothelial cancer-specific mortality) and rates of residual tumor and risk stratification of non-muscle-invasive bladder cancer (NMIBC) after second TUR were evaluated.

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  • The study examines the diagnostic accuracy of cystoscopy, highlighting how it varies based on the experience of the physician conducting the procedure.
  • Researchers compared eye movement patterns of 24 medical students and 10 urologists while observing cystoscopic images, focusing on their ability to detect lesions, especially with the help of artificial intelligence (AI).
  • Results showed that urologists had a broader and more efficient gaze across images, indicating better lesion identification skills, while medical students were more focused on AI-detected lesions, suggesting differences in their observational strategies.
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  • The study compares the effectiveness of photodynamic diagnosis (PDD)-assisted transurethral resection of bladder tumor (TURBT) versus traditional white-light (WL) TURBT in preventing recurrence of non-muscle-invasive bladder cancer (NMIBC) in 1,174 patients.
  • It found that PDD-TURBT led to significantly longer recurrence-free survival (RFS) compared to WL-TURBT, both before and after adjusting for other patient factors.
  • However, the benefit of PDD was not observed in patients with tumors larger than 30 mm.
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The first sharp diffraction peak (FSDP) in the total structure factor has long been regarded as a characteristic feature of medium-range order (MRO) in amorphous materials with a polyhedron network, and its underlying structural origin is a subject of ongoing debate. In this study, we utilized machine learning molecular dynamics (MLMD) simulations to explore the origin of FSDP in two typical high-density silica glasses: silica glass under pressure and permanently densified glass. Our MLMD simulations accurately reproduce the structural properties of high-density silica glasses observed in experiments, including changes in the FSDP intensity depending on the compression temperature.

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We evaluated the usable specimen thickness of Si for lattice imaging on a transmission electron microscopy (TEM) instrument operating at 300 kV and equipped with a complementary metal-oxide-semiconductor camera by using an original reference material (RM) and comparing the lattice images obtained from Si patterns of the RM with various thicknesses. Lattice images of the {111} planes of crystalline Si are successfully observed for patterns with thicknesses of up to 508 nm. However, the contrast of these lattice fringes at a thickness of 508 nm is not distinct, even when recorded using a longer exposure time (5.

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Background: Japanese men receiving apalutamide often experience skin-adverse events (AEs), possibly requiring treatment interruption or dose reduction. However, concerns have arisen regarding the impact of these adjustments on the efficacy of apalutamide. Our study evaluated the efficacy, safety, and persistence of apalutamide in men with metastatic castration-sensitive prostate cancer (mCSPC).

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Objectives: Bladder cancer, especially non-muscle invasive bladder cancer (NMIBC), is one of the most costly cancers owing to its long-term management. Photodynamic diagnosis-assisted transurethral resection of bladder tumor (PDD-TURBT) reduces the risk of intravesical recurrence. However, its impact on healthcare economics in Japan remains unclear.

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  • Osteosarcoma causes significant lung metastasis, leading to a low 5-year survival rate (20-30%), thus necessitating a reliable mouse model for research on better treatment options.
  • The study establishes a straightforward endotracheal injection technique to implant tumors in the lungs of mice, confirming proper placement with crystal violet dye and injecting osteosarcoma cells for tumor growth.
  • Results show a 100% success rate in dye injection and a 75% success in tumor detection in the lungs five weeks post-injection, indicating the method’s effectiveness for studying lung-metastatic osteosarcoma.
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Objectives: The objective of this work is to evaluate the additional oncological benefit of photodynamic diagnosis (PDD) using blue-light cystoscopy in transurethral resection (TURBT) for primary non-muscle-invasive bladder cancer (NMIBC) based on the International Bladder Cancer Group (IBCG)-defined progression and the subsequent pathological pathways.

Patients And Methods: We reviewed 1578 consecutive primary NMIBC patients undergoing white-light TURBT (WL-TURBT) or PDD-TURBT during 2006-2020. One-to-one propensity score-matching was performed using multivariable logistic regression to obtain balanced groups.

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  • The study analyzes the effectiveness of photodynamic diagnosis during bladder tumor surgery (PDD-TURBT) compared to standard white light surgery (WL-TURBT) for treating non-muscle-invasive bladder cancer (NMIBC) over a nine-year period.
  • Results indicate that patients treated with PDD-TURBT had a significantly lower rate of intravesical recurrence within 500 days, particularly benefiting those under 75 and with primary diseases.
  • However, the study also found a higher occurrence of intraoperative hypotension, particularly in patients aged 75 and older, indicating different risk profiles for different age groups.
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The development of a novel therapy to overcome primary and acquired resistance to abiraterone is an unmet need. This study aimed to evaluate the efficacy and safety of adding 5α-reductase inhibitor dutasteride to abiraterone, explore proof of concept, and identify candidates suitable for combination therapy. This phase II, single-arm, and open-label study enrolled second-generation antiandrogen- and chemotherapy-naïve patients with castration-resistant prostate cancer.

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Tellurium (Te) is an industrially useful element but causes environmental contamination. The formation of biogenic Te nanorods (Te-BgNRs) in plants is one of the Te detoxification pathways associated with the phytoremediation of Te because Te-BgNRs contain low-toxicity Te at high densities. In this study, we investigated the mechanism of Te-BgNR formation in a common unicellular green alga, Chlamydomonas reinhardtii, on the basis of elemental analysis by inductively coupled plasma mass spectrometry (ICP-MS).

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