Publications by authors named "Arakawa F"

Idiopathic carpal tunnel syndrome is the most common entrapment neuropathy in hand surgery, and it is characterized by Noninflammatory fibrosis of subsynovial connective tissues. The prevalence and incidence differ between male and female individuals, and the mechanism underlying this difference remains largely unclear. In the present study, we collected subsynovial connective tissues from six male and six female patients diagnosed with idiopathic carpal tunnel syndrome during surgery.

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We report a case of a 24-year-old man who developed angioimmunoblastic T-cell lymphoma (AITL) after treatment for refractory lymphocyte-rich classic Hodgkin lymphoma (LR-CHL). This patient was treated with the BV+AVD (brentuximab vedotin, doxorubicin, vinblastine, and dacarbazine) protocol for LR-CHL but progressed before completing chemotherapy. The pathological imaging showed the typical findings of LR-CHL at the first onset and first progression.

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Metal ion-nucleic acid interactions contribute substantially to the structure and biological activity of nucleic acids and have a wide range of potential applications in nanotechnology. In this study, we examined the interactions between metal ions and mismatched base pairs in duplex DNA to reveal the underlying molecular mechanism. UV melting analyses showed that the melting temperature () of a 21-base pair duplex DNA with each of the C-A, C-C and C-T mismatched base pairs increased upon the addition of Ag.

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Classic Hodgkin lymphoma (CHL) harbors a small number of Hodgkin-Reed-Sternberg (HRS) cells scattered among numerous lymphocytes. HRS cells are surrounded by distinct CD4 T cells in a rosette-like manner. These CD4 T cell rosettes play an important role in the tumor microenvironment (TME) of CHL.

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Metal ion-nucleic acid interactions contribute significantly to nucleic acid structure and biological activity and have potential applications in nanotechnology. Hg specifically binds to the natural T-T mismatched base pair in duplex DNA to form a T-Hg-T base pair. Metal ions may enhance DNA damage induced by DNA-damaging agents, such as oxidative agents.

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Lymphomatoid granulomatosis (LYG) is a rare lymphoproliferative disorder (LPD). The optimal management strategy of methotrexate (MTX) related-LPD with central nervous system (CNS) involvement and histological features of LYG remains unclear. We herein report a case of grade 2-3 LYG in a rheumatoid arthritis patient, in which an intracranial mass accompanied by hemorrhaging and pulmonary and skin lesions developed.

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Telomere length is maintained by the activation of telomerase, which causes continuous cell division and proliferation in many carcinomas. A catalytic reverse transcriptase protein (TERT) encoded by the TERT gene plays a critical role in the activation of telomerase. We performed a molecular and pathological analysis of the TERT against three different peripheral T-cell lymphoma (PTCL) subtypes: PTCL, not otherwise specified (PTCL-NOS), angioimmunoblastic T-cell lymphoma (AITL), and adult T-cell leukemia/lymphoma (ATLL).

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This is the first case of follicular T-cell lymphoma (FTCL) presenting as methotrexate-associated lymphoproliferative disorders (MTX-LPDs). A 69-year-old man treated rheumatoid arthritis with methotrexate presented with cervical swelling, hoarseness and fever. Imaging studies revealed multiple lymphadenopathy and lymphoma was suspected.

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Marginal zone B-cell lymphomas (MZBCLs) are non-Hodgkin lymphomas arising from postgerminal center marginal zone B cells. MZBCLs are subclassified into extranodal, nodal, and splenic MZBCLs. Primary nondural central nervous system (CNS) MZBCLs of the mucosa-associated lymphoid tissue (MALT) type are among the extranodal examples.

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This is the first reported case of follicular T-cell lymphoma (FTCL) that primarily developed in the extranodal site of the right submandibular gland. An 86-year-old man was detected with a right cervical mass suspected to be malignant lymphoma during his physical examination. Imaging studies revealed that the mass was a submandibular gland tumor.

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Article Synopsis
  • Adult T-cell leukemia/lymphoma (ATLL) is linked to the human T-cell leukemia virus type 1 (HTLV-1), with key roles played by the HBZ and tax mRNA in its development.
  • A study analyzed 88 ATLL tissue samples and found that high HBZ and tax expression levels were associated with specific clinicopathological features, including increased skin lesions and tumor-infiltrating lymphocytes.
  • Patients with very high tax expression had lower HLA class I and β2M levels and significantly poorer overall survival rates, suggesting that treatment for ATLL should be approached cautiously in high tax expression cases.
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  • * Diagnostic methods included bone marrow biopsy for FL and additional biopsies from the testis and pancreas for B-LBL, followed by cytogenetic and molecular analyses to explore their relationship.
  • * The findings revealed common genetic alterations (BCL2-IGH and MYC-IGH translocations) in tumor cells from different sites, suggesting that the MYC gene rearrangement plays a vital role in the transformation of FL into B-LBL.
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Follicular lymphoma (FL) is a germinal center-derived B-cell lymphoma that is known to proliferate in the intrafollicular region. However, lymphoma cells can be identified in the extrafollicular regions, which are related to disease dissemination. We purified the intrafollicular and extrafollicular regions of FL cells by laser microdissection and conducted microarray analysis in order to characterize the gene expression profiles of FL cells from both regions.

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Article Synopsis
  • Follicular T-cell lymphoma (FTCL) likely originates from follicular helper T-cells and is associated with RHOA G17V mutations, similar to other T-cell lymphomas like angioimmunoblastic T-cell lymphoma (AITL).
  • In a study of 16 FTCL cases, 9 showed RHOA mutations, with variations linked to different clinicopathological features, indicating a tendency for B-immunoblasts and AITL characteristics in mutation-positive cases.
  • While RHOA mutations may influence certain features of FTCL, there was no significant difference in overall survival between mutation-positive and mutation-negative groups, suggesting a need for further research on their role in the disease.
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  • Total Diet Study (TDS) is important for estimating dietary intake of hazardous substances, with guidance from the WHO on method validation.
  • Despite various guidelines, clear procedures for confirming method validity are still lacking.
  • This study introduced SEMPs to test analytical methods for measuring elements like arsenic and lead, establishing a performance evaluation through repeated analysis of both fortified and non-fortified samples.
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Primary splenic low-grade B-cell lymphoma of the red pulp comprises hairy cell leukemia (HCL) and splenic B-cell lymphoma/leukemia, unclassifiable (SPLL-U). SPLL-U is a rare disease that includes subtypes of a hairy cell leukemia-variant (HCL-v), splenic diffuse red pulp small B-cell lymphoma (SDRPL) and other types that are known as narrow sense SPLL-U (SPLL-U-NS). Notably, limited information is available regarding the BRAF mutation (V600E) and cyclin D3 expression in subtypes of SPLL-U.

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Adult T-cell leukemia/lymphoma (ATLL) in Japan presents at a median age of 70 years and only 5% of patients are <50 years of age. We conducted RNA and targeted DNA sequencing of 8 ATLLs from Japanese patients <50 years of age and identified 3 (37.5%) with both CTLA4-CD28 and inducible costimulator (ICOS)-CD28 fusions.

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Article Synopsis
  • - The study investigates in situ follicular neoplasm (ISFN), a rare condition previously seen as a precursor to follicular lymphoma, focusing on its features in Japan based on 19 biopsy samples.
  • - Two types of ISFN were identified: one with strong BCL-2 positivity and translocation, and another resembling follicular lymphoma without obvious translocation.
  • - Analysis revealed a significant occurrence of ISFN alongside other lymphomas, but molecular findings indicated that ISFN and follicular lymphoma lesions in the same lymph node exhibit different clonality.
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Allogeneic hematopoietic cell transplantation (allo-HSCT) is considered the curative treatment option in patients with aggressive adult T cell leukemia/lymphoma (ATLL), but the treatment of relapse after allo-HSCT remains a major challenge. We report a case of ATLL that was treated with sequential mogamulizumab (MOG) and lenalidomide (LEN) for early relapse after allo-HSCT. A 73-year-old Japanese male with acute-type ATLL underwent haploidentical-HSCT with post-transplant cyclophosphamide.

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Article Synopsis
  • The study investigates the effects of a humanized CCR4 antibody called mogamulizumab on patients with aggressive adult T-cell leukemia-lymphoma (ATL), analyzing data from 22 patients treated from 2012 to 2018.
  • Results showed an overall response rate of 68.1% after 4 treatment courses, but the median overall survival was only 95.5 days, with 6 and 12-month survival rates at 31.5% and 21.1%, respectively.
  • Patients with CCR4 mutations exhibited a poorer response to treatment compared to those with wild-type CCR4, suggesting a potential link between CCR4 expression and treatment efficacy, warranting further research to identify more predictive markers.
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The hepatitis C virus (HCV) is a single-stranded RNA virus which is thought to be involved in the onset of B cell lymphoma. HCV-positive diffuse large B cell lymphoma (DLBCL) has been reported to clinically manifest in extranodal lesions (e.g.

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A new impregnation method was tested in this study. Without a stabilizing agent, silver and copper metallic compounds were directly impregnated on activated carbon using vacuum impregnation followed by drying at 100°C and vacuum impregnation followed by thermal decomposition at 350°C in an ambient atmosphere. The effect of thermal decomposition on the structural, morphological, and textural characteristics of the modified nanomaterials was analysed by Brunauer-Emmett-Teller, X-ray diffraction, scanning electron microscopy, energy dispersive X-Ray, and transmission electron microscopy.

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