Publications by authors named "Tomoki Nakamura"

Background: Soft tissue sarcomas (STSs) are a diverse group of rare malignant tumors accounting for <1% of all human tumors. Almost 50% of patients with STS develop metastatic disease, mainly within 3 years of initial diagnosis. Lung metastasis occurs in 20%-30% of STS cases, while bone metastasis is rare.

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Background: Osteosarcoma (OS), the most common pediatric bone tumor, faces challenges with frequent relapse despite treatment advances. Identifying early diagnostic biomarkers and therapeutic targets is critical. The purpose of this study was to investigate the novel biomarkers for OS, and we also aimed to explore whether these biomarkers could potentially serve as the therapy targets.

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Millimeter-sized silicate spherules embedded in primitive meteorites, namely, "chondrules," are the primary solid component of the early solar nebula. They exhibit distinctive solidification textures, formed through rapid cooling from a molten state. The formation conditions of these textures have primarily been inferred on the basis of dynamic crystallization experiments; however, the theoretical verification of the solidification process has been largely neglected.

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Synovial sarcoma (SS) is the most common soft tissue sarcoma in children and adolescents. Despite the availability of new agents such as pazopanib and trabectedin, the prognosis after recurrence remains poor. Adoptive cell therapy is an emerging therapeutic strategy based on the modulation, manipulation, and selection of autologous T-cells in vitro to overcome immune system tolerance to tumor cells.

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Objective: The primary aim of this study was to compare the surgical invasiveness of internal fixation for pathological fractures caused by metastatic bone tumors with that for traumatic fractures. The secondary aim was to identify factors contributing to the complexity of surgeries for metastatic bone disease and provide insights for improving surgical strategies by analyzing operative time and blood loss.

Methods: Patients undergoing internal fixation for femoral fractures at 10 institutions between January 2021 and December 2023 were included.

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Soft tissue sarcoma (STS) is a rare and heterogeneous disease, which can result in surgeons not considering STS as a differential diagnosis when they encounter a lump. However, unplanned excision (UE) often occurs in nonspecialized sarcoma centers. Before re-excision (RE) after UE, radiological examinations such as magnetic resonance imaging (MRI) should be performed to determine the surgical margin and conduct a pathological evaluation of the UE.

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Background: Procedural techniques such as dissection and separation of blood vessels or nerves from the tumor for preserving limbs and functions involves high surgical difficulty. We hypothesized the relation of vessel and/or nerve preservation to surgical time and blood loss, accurately reflecting surgical difficulty. In this study, we elucidated the variables affecting surgical time and intraoperative bleeding in patients with malignant soft tissue tumors who did not undergo any reconstruction after tumor resection.

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Trabectedin extravasation can cause significant soft tissue disorders. Early surgical intervention has been recommended in the event of chemotherapeutic extravasation; however, treatment tends to remain conservative. Trabectedin is a vesicant drug that is associated with a risk of delayed tissue damage; therefore, leaks should be promptly stopped.

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Background: () is associated with a variety of malignancies. However, the role of in osteosarcoma and its underlying mechanism are not yet fully understood. This study aimed to explore the role and the mechanism of in osteosarcoma.

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Background/aim: Cryoablation is a new, minimally invasive option for local tumor therapy that is attracting attention due to its potential interactions with the immune system. The purpose of this study was to evaluate the efficacy of cryoablation for local control of bone and soft tissue lesions, to elucidate risk factors for recurrence, and to clarify histological changes.

Patients And Methods: Participants comprised 25 patients who underwent cryoablation for 53 discrete lesions of bone or soft tissue recurrence after resection or as metastases of cancer or sarcoma.

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Article Synopsis
  • Osteochondromas are benign growths typically found in the long bones' metaphyseal region, with a very low risk of turning malignant, although cases of transformation to osteosarcoma are rare.
  • A 66-year-old woman experienced abdominal pain leading to the discovery of osteosarcoma derived from osteochondromas in her right iliac bone; after chemotherapy and surgical removal, pathology confirmed the diagnosis.
  • Three years post-surgery, the patient showed no signs of cancer recurrence or metastasis and regained the ability to walk unaided, but ongoing monitoring is advised.
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Article Synopsis
  • * The patient group consisted of nearly equal numbers of men and women, with a mean age of 62 years, and the UE procedures were performed by various types of surgeons, including plastic, orthopedic, and general surgeons.
  • * Results showed high rates of inappropriate surgical techniques, with many patients requiring re-excisions and subsequent soft-tissue reconstruction, highlighting the need for improved education on sarcoma management for all surgeons.
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The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies.

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Returned samples from the carbonaceous asteroid (162173) Ryugu provide pristine information on the original aqueous alteration history of the Solar System. Secondary precipitates, such as carbonates and phyllosilicates, reveal elemental partitioning of the major component ions linked to the primordial brine composition of the asteroid. Here, we report on the elemental partitioning and Mg isotopic composition (Mg/Mg) of breunnerite [(Mg, Fe, Mn)CO] from the Ryugu C0002 sample and the A0106 and C0107 aggregates by sequential leaching extraction of salts, exchangeable ions, carbonates, and silicates.

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Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended hydrothermal processing. Surface regolith collected by the Hayabusa2 spacecraft from the carbon-rich asteroid 162173 Ryugu present a unique opportunity to untangle the sources and processing history of carbonaceous matter. Here we show carbonaceous grains in Ryugu can be classified into three main populations defined by spectral shape: Highly aromatic (HA), Alkyl-Aromatic (AA), and IOM-like (IL).

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Article Synopsis
  • Malignant chest wall tumors require extensive resection and careful reconstruction, using vascularized tissue for both soft tissue and bone defects, with this study assessing how different reconstruction strategies impact complications.
  • The research analyzed data from 45 patients who underwent 52 operations, categorizing tumors into superficial and deep types and examining outcomes based on the chosen reconstruction method.
  • Results showed a local recurrence-free survival rate of 83.9% at 5 years, but a surgical complication rate of 11.5%, notably higher in deep tumors that required flap transfers, with these strategies being key risk factors for complications.
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(1) Background: Exosomal PD-L1 has garnered attention owing to its role in instigating systemic immune suppression. The objective of this study is to elucidate whether bone and soft tissue sarcoma cells possess the capacity to secrete functionally active exosomal PD-L1 and whether radiotherapy (RT) induces the exosomal PD-L1 release. (2) Methods: Human osteosarcoma cell line 143B and human fibrosarcoma cell line HT1080 were utilized.

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We report primordial aqueous alteration signatures in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 spacecraft of JAXA. Newly identified low-molecular-weight hydroxy acids (HO-R-COOH) and dicarboxylic acids (HOOC-R-COOH), such as glycolic acid, lactic acid, glyceric acid, oxalic acid, and succinic acid, are predominant in samples from the two touchdown locations at Ryugu. The quantitative and qualitative profiles for the hydrophilic molecules between the two sampling locations shows similar trends within the order of ppb (parts per billion) to ppm (parts per million).

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Article Synopsis
  • A multicenter study in Japan compared clinical outcomes for patients with pelvic bone sarcomas treated with surgery versus particle beam therapy (carbon-ion and proton).
  • The study included 116 patients, with 57 receiving surgery and 59 undergoing particle beam therapy, revealing differences in median age at diagnosis and tumor size between the groups.
  • Overall survival, local control, and metastasis-free survival rates were similar between the groups, but in chordoma patients, the particle beam therapy showed significantly better local control rates compared to surgery.
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Background: Prompt histopathological diagnosis with accuracy is required for soft tissue sarcomas (STSs) which are still challenging. In addition, the advances in artificial intelligence (AI) along with the development of pathology slides digitization may empower the demand for the prediction of behavior of STSs. In this article, we explored the application of deep learning for prediction of prognosis from histopathological images in patients with STS.

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Extraterrestrial minerals on the surface of airless Solar System bodies undergo gradual alteration processes known as space weathering over long periods of time. The signatures of space weathering help us understand the phenomena occurring in the Solar System. However, meteorites rarely retain the signatures, making it impossible to study the space weathering processes precisely.

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Introduction: Musculoskeletal transfer for chest wall tissue defects is a crucial method, and pedicled flaps around the chest wall are preferred in terms of location and simplicity of transfer. These require special care because of complications such as partial necrosis, fistula, wound dehiscence, infection, hematoma and restricted function of the arm or shoulder. However, studies of respiratory function are rare.

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Background: Sarculator is a validated nomogram designed to predict overall survival (OS) in extremity soft tissue sarcoma (STS). Inflammation plays a critical role in cancer development and progression. There were no reports which investigated the relationship between Sarculator and inflammation.

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Background/aim: 5-Aminolevulinic acid (5-ALA) is a natural amino acid and a precursor of protoporphyrin IX (PpIX). Following light irradiation, the PpIX generates reactive oxygen species (ROS) in the presence of oxygen. Increased ROS levels can cause apoptotic cell death and necrosis of targeted cancer cells.

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Article Synopsis
  • Osteosarcoma (OS) is a common and aggressive bone cancer, necessitating the development of new treatment strategies since existing therapies have been stagnant since the 1970s.
  • The study tested the combination of Pazopanib (PZP) with various compounds and found that crizotinib (CRZ) was the most effective partner, leading to improved anti-tumor effects in both cell lines and mouse models.
  • Results showed that the combination treatment resulted in reduced levels of specific cancer-related proteins and increased markers of apoptosis, suggesting that this dual therapy could enhance clinical outcomes for OS patients.
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Synopsis of recent research by authors named "Tomoki Nakamura"

  • - Tomoki Nakamura's research spans the realms of oncology and planetary science, particularly focusing on osteosarcoma in patients with hereditary conditions and the implications of soft tissue sarcomas in clinical settings.
  • - Recent studies led by Nakamura have also investigated the isotopic and elemental composition of samples from the asteroid Ryugu, providing insights into the early solar system's chemistry and the processes affecting organic matter within extraterrestrial contexts.
  • - Additionally, Nakamura has explored advanced methodologies like artificial intelligence in histopathological image analysis to improve prognostic accuracy for soft tissue sarcomas, reflecting a commitment to integrating technology with medical research.