Publications by authors named "Go Kobayashi"

Background: Urothelial carcinoma (UC) is a common type of malignant disease; however, the diagnostic and prognostic markers of upper urinary tract urothelial cancer (UTUC) remain poorly understood because of its rarity.

Methods: To clarify the clinicopathological significance of granulocyte-colony stimulating factor (G-CSF) in UTUC, we analyzed the expression and distribution of G-CSF in 112 upper tract urothelial carcinoma (UTUC) samples with immunohistochemistry.

Results: In normal urothelium, G-CSF expression was weak or absent, whereas high expression of G-CSF was observed in UTUC tissues, both in tumor cells (TCs) and stromal cells (SCs).

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Recent advancements in proteomics technologies using formalin-fixed paraffin-embedded (FFPE) samples have significantly advanced biomarker discovery. Yet, the effects of varying sample preparation protocols on proteomic analyses remain poorly understood. We analyzed mouse liver FFPE samples that varied in fixatives, fixation duration, and storage temperature using LC/MS.

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Gastric cancer (GC) is still one of the leading causes of cancer-related mortality. We previously reported the relationship between histological heterogeneity of tumor cells and molecular features in GC. The tumor microenvironment also has a crucial role in GC progression and therapeutic resistance.

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  • MCM4, previously linked to gastric cancer, shows strong nuclear expression in upper tract urothelial carcinoma (UTUC), with 62% of cases exhibiting this overexpression and correlating with aggressive tumor characteristics.
  • High MCM4 levels in UTUC are positively associated with poor prognosis, high tumor grade, and invasive characteristics, as well as with other cancer markers like Ki-67 and p53.
  • MCM4 immunocytochemistry enhances urine cytology diagnostics for UC, suggesting its potential as a predictive biomarker for tumor progression and survival outcomes.
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βIII-Tubulin, encoded by the TUBB3 gene, is a microtubule protein. We previously reported that TUBB3 is overexpressed in renal cell carcinoma. We investigated the clinicopathological significance of TUBB3 in upper tract urothelial carcinoma (UTUC) by immunohistochemistry.

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Background: Urothelial carcinoma (UC) is a common type of human cancer and, although urine cytology is a useful method for identifying high-grade UC (HGUC), its ability to diagnose low-grade UC (LGUC) is limited. The authors previously reported that annexin A10 (ANXA10) expression was strongly linked to both papillary and early stage LGUC and was inversely correlated with p53 expression in upper tract UC (UTUC) and bladder UC. However, it remains largely unknown whether ANXA10 is useful as a diagnostic marker for urine cytology.

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Bilateral synchronous paratesticular leiomyoma (BSPL) is a rare tumor that originates from smooth muscle cells in the paratesticular region. Four BSPL cases have been reported sporadically, starting with the 1991 report by Aus and Boiesen. Herein, we report the case of a 60-year-old male with a bilateral scrotal mass with a maximum size of 7.

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Mucin 1 (MUC1) overexpression has been reported in many malignancies and is associated with a poor prognosis. However, the clinicopathological significance of MUC1 in upper tract urothelial carcinoma (UTUC) has not been investigated. We analyzed the expression and distribution of MUC1 in UTUC by immunohistochemistry.

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Introduction: Gastric cancer (GC) is a leading cause of cancer-related death worldwide. This study focused on minichromosome maintenance 4 (MCM4), a DNA helicase component that functions in DNA replication. Using spheroid colony formation, having a colony rich in cancer stem cells, this study aimed to investigate the clinicopathological importance of MCM4.

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Introduction: Urothelial carcinoma (UC) is a common type of malignant disease, but little is known about the diagnostic and prognostic markers of upper urinary tract urothelial cancer (UTUC) because of its rarity. To clarify the significance of ANXA10 in UTUC, we studied ANXA10 expression with immunohistochemistry (IHC).

Methods: The expression of ANXA10 was analyzed in the upper and lower urinary tract of UC by IHC in combination with The Cancer Genome Atlas (TCGA) data analysis.

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  • UV irradiation enhances the wettability of β-tricalcium phosphate (TCP), reducing the contact angle significantly from 70° to 10°.
  • The study found that while UV treatment did not alter the composition of carbon, oxygen, and phosphorus in β-TCP, it significantly improved the adhesion of bone marrow cells after 10 to 30 hours.
  • In a rabbit sinus model, UV-irradiated β-TCP demonstrated increased osteogenesis and higher numbers of TRAP-positive cells, supporting its potential for use in surgical bone augmentation.
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Mucinous urothelial carcinoma (UC) is a rare variant and only 18 cases of mucinous UC have been reported. In this article, we report a case of mucinous UC focusing on both cytological and histological findings. A 92-year-old female was referred to our hospital because of gross hematuria.

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  • Claspin is identified as a significant regulator in gastric and renal cancers, but its role in urothelial carcinoma (UC) had not been explored until now.
  • Analysis showed that claspin expression was weak or absent in normal urothelium, but present in 42% of UC cases, correlating with aggressive features like high tumor grade and invasiveness.
  • The presence of claspin is associated with poorer survival rates and may serve as both a new prognostic marker and a potential therapeutic target in urothelial carcinoma.
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Although docetaxel (DTX) confers significant survival benefits in patients with castration-resistant prostate cancer (CRPC), resistance to DTX inevitably occurs. Therefore, clarifying the mechanisms of DTX resistance may improve survival in patients with CRPC. Claspin plays a pivotal role in DNA replication stress and damage responses and is an essential regulator for the S-phase checkpoint.

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Background: Tryptophan 2,3-dioxygenase (TDO2) is the primary enzyme catabolizing tryptophan. Several lines of evidence revealed that overexpression of TDO2 is involved in anoikis resistance, spheroid formation, proliferation, and invasion and correlates with poor prognosis in some cancers. The aim of this research was to uncover the expression and biofunction of TDO2 in renal cell carcinoma (RCC).

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Introduction: BUB1 mitotic checkpoint serine/threonine kinase B encoded by BUB1B gene is a member of the spindle assembly checkpoint family. Several reports have demonstrated that overexpression of BUB1B is associated with cancer progression and prognosis.

Objective: This study aims to clarify the expression and function of BUB1B in renal cell carcinoma (RCC).

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Background: Gastric cancers (GCs) are still one of the leading causes of cancer-related mortality. The histological and molecular features of GC may differ widely from area to area within the same tumor. Intratumoral heterogeneity has been considered a major obstacle to an efficient diagnosis and successful molecular treatment.

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  • Intelectin-1 (ITLN1) is a protein linked to anti-inflammatory functions and cancer, but its role in colorectal cancer (CRC) was previously unknown.
  • In a study of 148 CRC cases, 59% showed reduced ITLN1 expression, which correlated with more aggressive tumor grades and poorer prognosis.
  • Further analysis indicated that reduced ITLN1 levels promote tumor growth and influence cancer pathways, suggesting ITLN1 might be a significant factor in colorectal tumor development.
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  • - βIII-Tubulin, from the TUBB3 gene, is a protein linked to poor cancer prognosis and taxane resistance; this study investigates its role in clear cell renal cell carcinoma (ccRCC).
  • - Analysis of 137 ccRCC samples showed 20% had high TUBB3 expression, correlating with aggressive tumor traits and worse survival rates post-surgery.
  • - TUBB3 knockdown reduced cancer cell growth and invasion, suggesting it may be involved in oncogenic processes, alongside interactions with markers like p53 and PD-L1, indicating it could be a potential treatment target.
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Renal cell carcinoma (RCC) is one of the most common human cancers. We previously reported that claspin is a key regulator in the progression of gastric cancer, and it likely plays an important role in cancer stem cells of gastric cancer. However, the significance of claspin in RCC has not been examined.

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  • Gastric cancer (GC) is a major cause of cancer-related deaths and the study focuses on identifying cancer stem cells (CSCs) to find new prognostic markers or treatment targets.
  • Researchers found that the CLSPN gene is overexpressed in spheroid colony-forming GC cells, with higher messenger RNA levels noted in several GC cell lines.
  • Claspin expression in gastric cancer cases is linked to more aggressive tumor characteristics and poor prognosis, and reducing its expression can hinder cancer cell growth and invasion, indicating its potential role in GC progression.
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We report the first use of endoscopic submucosal dissection (ESD) for the treatment of a patient with adenoid cystic carcinoma of the esophagus (EACC). An 82-year-old woman visited our hospital for evaluation of an esophageal submucosal tumor. Endoscopic examination showed a submucosal tumor in the middle third of the esophagus.

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  • - A rare case of acute liver injury was reported in a 41-year-old man following treatment for internal hemorrhoids using a submucosal injection of aluminum potassium sulfate and tannic acid (ALTA) combined with lidocaine.
  • - The liver injury was identified as hepatocellular and cholestatic, but the exact mechanism behind the injury couldn't be determined; high levels of eosinophils and immunoglobulin E were noted, while a lymphocyte stimulation test returned negative results after 25 days.
  • - The patient's liver condition improved significantly after two weeks of fluid replacement therapy, highlighting the need for further analysis of similar cases in the future as this is the first reported severe liver disorder linked to ALTA treatment.
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Materials fabricated with unsintered hydroxyapatite/poly-l-lactic acid (uHA/PLLA) exhibit biological activity and biocompatibility, but are also hydrophobic. This hydrophobicity limits the ability of cells or tissues to adhere to the surface of the material and thereby prevents the materials from exhibiting effective biological activity. In this study, we examined the effects of ultraviolet (UV) treatment on the hydrophobicity of uHA/PLLA.

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