Updated on 2025/06/22

Information

 

写真a

 
TSUBOUCHI KAZUYA
 
Organization
Kyushu University Hospital Respiratory medicine Assistant Professor
School of Medicine Department of Medicine(Concurrent)
Title
Assistant Professor
Contact information
メールアドレス
Tel
0926425378
Profile
Clinical practice of respiratory medicine (outpatient care, inpatient care, medical conferences). Elucidation of the pathogenesis of interstitial lung disease. Planning and conducting new clinical trials regarding interstitial pneumonia. Lectures, practical training, and research guidance for undergraduate and graduate students.

Research Areas

  • Life Science / Respiratory medicine

  • Life Science / General internal medicine

  • Life Science / Molecular biology

Degree

  • Ph.D

Research History

  • Kyushu University Kyushu University Hospital Respiratory medicine  Assistant Professor 

    2022.4 - Present

Research Interests・Research Keywords

  • Research theme: Exploration of the Involvement of Endothelial cellular senescence in IPF and PH pathogenesis.

    Keyword: cellular senescence, idiopathic pulmonary fibrosis, pulmonary hypertension

    Research period: 2023.4 - Present

  • Research theme: Exploring the crucial role of signal regulatory protein α in airway epithelial cells

    Keyword: Surfactant protein D signal regulatory protein alpha(SIRPα)

    Research period: 2022.4 - Present

  • Research theme: Exploration of the mechanism of development of osimertinib lung disorders using a naphthalene airway injury model

    Keyword: Osimertinib Drug-induced interstitial pneumonia

    Research period: 2022.4 - 2024.4

  • Research theme: Regulation of mucus hypersecretion in airway goblet cells by surfactant protein D (SP-D).

    Keyword: Surfactant protein D mucus hypersecretion

    Research period: 2022.4 - 2023.3

Papers

  • Survival and acute exacerbation for patients with idiopathic pulmonary fibrosis (IPF) or non-IPF idiopathic interstitial pneumonias: 5-year follow-up analysis of a prospective multi-institutional patient registry Reviewed International journal

    Kazuya Tsubouchi, Naoki Hamada, Shoji Tokunaga, Katsuyuki Ichiki, Shohei Takata, Hiroshi Ishii, Yasuhiko Kitasato, Masaki Okamoto, Satoru Kawakami, Kazuhiro Yatera, Masayuki Kawasaki, Masaki Fujita, Makoto Yoshida, Takashige Maeyama, Taishi Harada, Hiroshi Wataya, Ryo Torii, Masashi Komori, Yuichi Mizuta, Kazunori Tobino, Eiji Harada, Hidetake Yabuuchi, Yoichi Nakanishi, Isamu Okamoto

    BMJ Open Respir Res.   2023.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Vascular-Parenchymal Cross-Talk Promotes Lung Fibrosis through BMPR2 Signaling Invited Reviewed International journal

    Toyoshi Yanagihara, Kazuya Tsubouchi, Quan Zhou, Michael Chong, Kohei Otsubo, Takuma Isshiki, Jonas C Schupp, Seidai Sato, Ciaran Scallan, Chandak Upagupta, Spencer Revill, Anmar Ayoub, Sy Giin Chong, Anna Dvorkin-Gheva, Naftali Kaminski, Jussi Tikkanen, Shaf Keshavjee, Guillaume Paré , Christophe Guignabert, Kjetil Ask, Martin R J Kolb

    Am J Respir Crit Care Med.   2023.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Mortality and exacerbation risk according to GOLD and STAR severity stages of COPD: a 5-year multicenter prospective cohort study

    Ogata, H; Tsubouchi, K; Takano, T; Ichiki, K; Torii, R; Takata, S; Nakagaki, N; Yoshida, M; Kitasato, Y; Tobino, K; Harada, E; Wataya, H; Ishii, H; Maeyama, T; Kawasaki, M; Fujita, M; Yatera, K; Zaizen, Y; Nakanishi, Y; Okamoto, I

    SCIENTIFIC REPORTS   15 ( 1 )   19097   2025.5   ISSN:2045-2322

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    The Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification, based on percent predicted forced expiratory volume in 1 s (ppFEV1), has been widely adopted for assessment of chronic obstructive pulmonary disease (COPD) severity. However, the STaging of Airflow obstruction by Ratio (STAR) system, based on the ratio of FEV1 to forced vital capacity, was recently proposed as an alternative classification. This study aimed to compare the prognostic performance of the GOLD and STAR classifications for prediction of mortality and exacerbation risk in individuals with COPD. This 5-year prospective, multicenter cohort study enrolled 370 individuals with COPD at 29 medical centers. All-cause mortality risk across GOLD and STAR stages was evaluated with Kaplan-Meier curves and Cox proportional hazards models. The risk of moderate to severe COPD exacerbations across GOLD and STAR stages was examined with cumulative incidence function (CIF) curves and Fine and Gray models. Both classification systems showed a significant association with mortality and exacerbation risk (P < 0.01 for trend). The GOLD classification provided a better separation of Kaplan-Meier and CIF curves for advanced stages, whereas the STAR classification showed a clearer distinction between stages I and II. These associations remained consistent after multivariable adjustments. The GOLD classification was superior for prediction of prognosis in advanced COPD, whereas the STAR classification provided better differentiation in early-stage disease. These findings highlight the complementary roles of the GOLD and STAR classifications in assessment of COPD severity.

    DOI: 10.1038/s41598-025-05033-w

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  • Penile Cancer: Differences Between Patients Over and Under the Age of 75 Years

    Murakami, Y; Yamaguchi, T; Goya, M; Higashijima, K; Tobu, S; Sato, R; Tatarano, S; Mukai, S; Uemura, KI; Tatsugami, K; Tsubouchi, K; Shida, Y; Ishii, T; Sakai, H; Matsuoka, H; Haga, N; Eto, M; Igawa, T; Kamoto, T; Enokida, H; Shin, T; Noguchi, M; Fujimoto, N; Saitoh, S; Kamba, T

    INTERNATIONAL JOURNAL OF UROLOGY   2025.5   ISSN:0919-8172 eISSN:1442-2042

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  • TAS-115 (Pamufetinib) in Patients With Chronic Fibrosing Interstitial Lung Disease With a Progressive Phenotype: Results of Phase 2b Randomized Clinical Trial

    Kondoh, Y; Okuda, R; Tsubouchi, K; Okamoto, M; Nishiyama, O; Sato, S; Oishi, K; Ishikawa, N; Chiba, H; Miyazaki, Y; Homma, S; Nishioka, Y; Ogura, T; Inoue, Y; Azuma, A

    AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE   211   2025.5   ISSN:1073-449X eISSN:1535-4970

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  • Involvement of naïve T cells in the pathogenesis of osimertinib-induced pneumonitis

    Ando, H; Tsubouchi, K; Yanagihara, T; Hata, K; Eto, D; Suzuki, K; Hamada, N; Okamoto, I

    SCIENTIFIC REPORTS   15 ( 1 )   10545   2025.3   ISSN:2045-2322

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    Osimertinib, a third-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor, effectively treats EGFR-mutated non-small cell lung cancer. Drug-induced interstitial lung disease, a potentially fatal complication of osimertinib, involves an increase in lymphocytes in the bronchoalveolar lavage fluid (BALF). As the precise role of these lymphocytes is unknown, we investigated the pathogenesis of osimertinib-induced pneumonitis using BALF obtained from patients, and an osimertinib-induced pneumonitis mouse model. Mass cytometry revealed the presence of CCR7+ CD45RA+ naïve T cells in the BALF of patients with osimertinib-induced pneumonitis. Body weight measurements, BALF analysis, histopathological evaluation and RNA sequencing of mouse lung tissue were performed to investigate immune cell involvement and the mechanisms underlying osimertinib-induced pneumonitis. In the mouse model, administration of osimertinib after naphthalene-induced damage to the bronchiolar epithelium exacerbated lung inflammation and resulted in significant weight loss. Immunofluorescence staining revealed the infiltration of CCR7+ cells into the lungs of mice treated with naphthalene and osimertinib. Bulk RNA sequencing identified an upregulation of chemokine-related biological processes, with increased expression of C–C motif chemokine ligand 21 (Ccl21) and C–C motif chemokine ligand 8 (Ccl8) in the lung tissue. Additionally, immunofluorescence staining confirmed elevated expression of Ccl21 and Ccl8 in the distal bronchiolar epithelium. This study provides insights into the mechanisms underlying osimertinib-induced pneumonitis.

    DOI: 10.1038/s41598-025-95271-9

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  • Involvement of naïve T cells in the pathogenesis of osimertinib-induced pneumonitis Reviewed International journal

    Hiroyuki Ando, Kazuya Tsubouchi, Toyoshi Yanagihara, Kentaro Hata, Daisuke Eto, Kunihiro Suzuki, Naoki Hamada, Isamu Okamoto

    Sci Rep.   2025.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Immunophenotyping of T Cells in Lung Malignancies and Cryptogenic Organizing Pneumonia

    Yanagihara, T; Hata, K; Matsubara, K; Kunimura, K; Suzuki, K; Tsubouchi, K; Ikegame, S; Fukui, Y; Okamoto, I

    JOURNAL OF CLINICAL MEDICINE   14 ( 2 )   2025.1   ISSN:2077-0383 eISSN:2077-0383

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    Language:English   Publisher:Journal of Clinical Medicine  

    Background: Lung malignancies, including cancerous lymphangitis and lymphomas, can mimic interstitial lung diseases like cryptogenic organizing pneumonia (COP) on imaging, leading to diagnostic delays. We aimed to identify potential biomarkers to distinguish between these conditions. Methods: We analyzed bronchoalveolar lavage fluid from 8 patients (4 COP, mean age 59.8 ± 13.5 years; 4 lung malignancies including 2 cancerous lymphangitis, 1 MALT lymphoma, and 1 diffuse large B cell lymphoma, mean age 67.8 ± 4.5 years) using mass cytometry with 35 T cell markers. Data were analyzed using principal component analysis (PCA) and unsupervised Citrus clustering. Results: PCA of T cell marker intensities effectively separated the two groups, with IL-2Rα, PD-L2, CD45RA, CD44, and OX40 being the top discriminating markers. Citrus analysis showed a significant increase in the CD16+ CD4+ and CD16+ CD8+ T cell populations in the COP group compared to lung malignancies. Conclusions: Our findings reveal distinct T cell immunophenotypes in COP versus lung malignancies, particularly increased CD16+ T cells in COP, which could serve as potential diagnostic biomarkers.

    DOI: 10.3390/jcm14020316

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  • Immunophenotyping of T Cells in Lung Malignancies and Cryptogenic Organizing Pneumonia Reviewed International journal

    Toyoshi Yanagihara, Kentaro Hata, Keisuke Matsubara, Kazufumi Kunimura, Kunihiro Suzuki, Kazuya Tsubouchi, Satoshi Ikegame, Yoshinori Fukui, Isamu Okamoto

    J Clin Med .   2025.1

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  • Krebs von den Lungen-6 surveillance in immune checkpoint inhibitor-induced pneumonitis

    Matsukane, R; Nakamura, S; Minami, H; Tsubouchi, K; Yoneshima, Y; Hata, K; Yasukochi, S; Suetsugu, K; Okamoto, I; Hirota, T

    JOURNAL FOR IMMUNOTHERAPY OF CANCER   12 ( 12 )   2024.12   eISSN:2051-1426

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    Language:English   Publisher:Journal for Immunotherapy of Cancer  

    Background The immune-related adverse event (irAE), pneumonitis, is a potentially fatal complication of immune checkpoint inhibitors (ICIs). Preventing its progression is crucial, emphasizing the need for effective screening tests. We evaluated the feasibility of using Krebs von den Lungen-6 (KL-6), a marker for interstitial pneumonitis, as a screening tool for pneumonitis. Methods We examined 500 patients with cancer divided into two groups: those with cancer other than non-small cell lung cancer (NSCLC) (Group 1, n=382) and those with NSCLC (Group 2, n=118). KL-6 levels were monitored before and during ICI treatment and analyzed for their correlation with pneumonitis. Results In Group 1, 37 patients (9.7%) developed pneumonitis. KL-6 levels were significantly elevated at irAE onset (pre: 222.0 U/mL, post: 743.0 U/mL, p<0.0001). Receiver operating characteristic curve analysis showed an area under the curve (AUC) of 0.903 (sensitivity 81.1%, specificity 91.6%) with a cut-off value 1.52 times pre-KL-6 levels, indicating that KL-6 is a reliable biomarker for pneumonitis. In these patients, the KL-6 level increased regardless of pneumonitis severity and was significantly elevated in patients with both symptomatic (pre: 205.0 U/mL, post: 674.5 U/mL, p<0.0001) and asymptomatic pneumonitis (pre: 314.0 U/mL, post: 743.0 U/mL, p<0.0001) at irAE onset. After irAE treatment, KL-6 levels in steroid-responsive patients remained unchanged; however, steroid-unresponsive patients had a significant increase in KL-6 levels at 1 month (1078 U/mL, p=0.031) compared with at irAE onset (678.0 U/mL). In Group 2, 24 patients (20.3%) developed irAE pneumonitis, with KL-6 levels elevated (pre: 360.5 U/mL, post: 506.5 U/mL, p=0.029) and an AUC of 0.683, indicating that KL-6 was less reliable in patients with NSCLC. Conclusions KL-6 is a viable screening biomarker in ICI-induced pneumonitis, particularly in patients without NSCLC. In patients with NSCLC, the significance of KL-6 monitoring is limited as it is not effective for detecting ICI-induced pneumonitis; their treatment is typically managed by pulmonary specialists. Early detection through KL-6 monitoring facilitates timely intervention for ICI-induced pneumonitis, potentially preventing treatment interruptions and reducing the need for immunosuppressants.

    DOI: 10.1136/jitc-2024-010114

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  • Interstitial Pneumonia Associated with Nodal T-follicular Helper Cell Lymphoma

    Nakamura Satoshi, Takano Tomotsugu, Nakatsuru Kousei, Tsubouchi Kazuya, Yamauchi Takuji, Hashisako Mikiko, Iwasaki Takeshi, Okamoto Isamu

    Internal Medicine   63 ( 23 )   3227 - 3231   2024.12   ISSN:09182918 eISSN:13497235

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    Language:English   Publisher:The Japanese Society of Internal Medicine  

    <p>Nodal T-follicular helper cell lymphoma (nTFHL), a hematologic neoplasm originating from T-follicular helper (TFH) cells, occasionally presents with pulmonary radiographic abnormalities, without neoplastic cellular infiltration. However, the precise mechanisms underlying non-neoplastic pulmonary opacities in patients with nTFHL remain unclear. Previous reports have shown that TFH cell abnormalities are associated with collagen disease and interstitial pneumonia with autoimmune features (IPAF). We herein report a patient with nTFHL accompanied by interstitial pneumonia diagnosed via lung and lymph node biopsies. These findings suggest the need to rule out nTFHL before diagnosing IPAF. </p>

    DOI: 10.2169/internalmedicine.3601-24

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  • 節性濾胞性ヘルパーT細胞リンパ腫に関連する間質性肺炎(Interstitial Pneumonia Associated with Nodal T-follicular Helper Cell Lymphoma)

    Nakamura Satoshi, Takano Tomotsugu, Nakatsuru Kousei, Tsubouchi Kazuya, Yamauchi Takuji, Hashisako Mikiko, Iwasaki Takeshi, Okamoto Isamu

    Internal Medicine   63 ( 23 )   3227 - 3231   2024.12   ISSN:0918-2918

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    Language:English   Publisher:(一社)日本内科学会  

    症例は72歳男性で、夜間の乾性咳嗽と3ヵ月で5kgの体重減少を認めた。免疫グロブリン(Ig)G、IgG4、IgE、可溶性インターロイキン-2受容体の血清レベルが高値で、抗核抗体、リウマトイド因子、ミエロペルオキシダーゼ抗好中球細胞質抗体が陽性であった。高解像度CTの所見では、可能性の高い通常型間質性肺炎パターンが示された。FDG-PET検査で、両側肺門および縦隔リンパ節を包囲する全身性リンパ節腫脹が判明した。気管支肺胞洗浄、経気管支針生検、皮膚生検、胸腔鏡下気管分岐部リンパ節生検および右下葉部分切除術を行い、節性濾胞性ヘルパーT細胞リンパ腫(nTFHL)・非特定型と診断した。右下葉生検の所見では、部分的器質化肺炎を伴う非特異性間質性肺炎パターンが認められた。複数の組織学的パターンの重複が認められ、特異的組織病理型が決定できなかったことから、肺症状はnTFHLに伴う続発性間質性肺炎であると考えられた。診断後に胸水が悪化したため、リンパ腫の節外浸潤の可能性を考慮してプレドニゾロン治療を開始すると、間質性肺炎が改善し、リンパ節サイズが縮小し、胸水量が減少した。

  • Krebs von den Lungen-6 surveillance in immune checkpoint inhibitor-induced pneumonitis Reviewed International journal

    Ryosuke Matsukane, Shoji Nakamura, Haruna Minami, Kazuya Tsubouchi, Yasuto Yoneshima, Kojiro Hata, Sai Yasukochi, Kimitaka Suetsugu, Isamu Okamoto, Takeshi Hirota

    J Immunother Cancer .   2024.12

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  • Update of prognosis and characteristics of chronic obstructive pulmonary disease in a real-world setting: a 5-year follow-up analysis of a multi-institutional registry

    Takano, T; Tsubouchi, K; Hamada, N; Ichiki, K; Torii, R; Takata, S; Kawakami, S; Nakagaki, N; Yoshida, M; Kitasato, Y; Tobino, K; Harada, E; Ishii, H; Wataya, H; Maeyama, T; Fujita, M; Yatera, K; Okamoto, M; Yabuuchi, H; Kiyomi, F; Tokunaga, S; Nakanishi, Y; Okamoto, I

    BMC PULMONARY MEDICINE   24 ( 1 )   556   2024.11   ISSN:1471-2466

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    Background: We conducted a prospective observational study to elucidate the long-term prognosis and management of chronic obstructive pulmonary disease (COPD) in clinical practice in Japan in the mid-2010s. Methods: This prospective cohort study included 29 facilities. Data from 427 patients clinically diagnosed with COPD, enrolled between September 2013 and April 2016, were analyzed. Interstitial pneumonia was excluded through a central multidisciplinary discussion. Follow-up data were collected for up to 5 years after patient registration. Results: At the time of registration, 53 patients clinically diagnosed with COPD did not have airflow limitation (AFL). In the cohort with AFL (n = 374), 232 patients completed a 5-year follow-up, while 49 patients died during the 1576.6 person-years of observation. The mean age was 71.7 years with an overall 5-year survival rate of 85.4%. Stratified by % forced expiratory volume in one second (FEV1), survival rates were 93.6% in the mild and moderate AFL group, 82.5% in the severe AFL group, and 66.1% in the very severe AFL group. The prognosis of the subpopulation without AFL was poor with a 5-year survival of 81.6%. This subpopulation exhibited respiratory symptoms, low vital capacity and total lung capacity, and emphysematous changes. Conclusions: Our study presents the 5-year survival and real-world clinical practice scenario of a prospective cohort of patients clinically diagnosed with COPD in Japan in the mid-2010s. The survival rates of our cohort were numerically better than the Japanese cohort in the 1990s, regardless of the high median age of this cohort. Overall, 12.4% of the patients in this cohort with no AFL at registration exhibited respiratory symptoms and distinct spirometric patterns, and had a poor prognosis.

    DOI: 10.1186/s12890-024-03347-5

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  • Update of prognosis and characteristics of chronic obstructive pulmonary disease in a real-world setting: a 5-year follow-up analysis of a multi-institutional registry Reviewed International journal

    Tomotsugu Takano, Kazuya Tsubouchi, Naoki Hamada, Katsuyuki Ichiki, Ryo Torii 4, Shohei Takata, Satoru Kawakami, Noriaki Nakagaki, Makoto Yoshida, Yasuhiko Kitasato, Kazunori Tobino, Eiji Harada, Hiroshi Ishii, Hiroshi Wataya, Takashige Maeyama, Masaki Fujita, Kazuhiro Yatera, Masaki Okamoto, Hidetake Yabuuchi, Fumiaki Kiyomi, Shoji Tokunaga, Yoichi Nakanishi, Isamu Okamoto

    BMC Pulm Med .   2024.11

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  • Comparing the safety and efficacy of nintedanib starting dose in patients with connective tissue disease-associated interstitial lung diseases

    Ayano, M; Tsubouchi, K; Suzuki, K; Kimoto, Y; Arinobu, Y; Akashi, K; Horiuchi, T; Okamoto, ; Niiro, H

    SCANDINAVIAN JOURNAL OF RHEUMATOLOGY   53 ( 4 )   255 - 262   2024.7   ISSN:0300-9742 eISSN:1502-7732

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    Language:English   Publisher:Scandinavian Journal of Rheumatology  

    Objective: This study aimed to analyse whether initiating nintedanib treatment at a reduced dose could improve the treatment continuation rate while maintaining efficacy in patients with connective tissue disease (CTD)-associated interstitial lung disease. Method: In total, 51 patients (age 61.6 ± 13.2 years; 38 women, 13 men) were retrospectively analysed. The primary endpoint was the cumulative discontinuation rate due to adverse events. Secondary endpoints included changes in drug dosage, efficacy evaluated based on annual changes in forced vital capacity (FVC), and safety assessed based on the frequency of adverse events. Results: Eighteen patients who started treatment at the standard dose of 300 mg (standard dosage group) were compared with 33 patients who started treatment at a reduced dose (reduced dosage group). Systemic sclerosis was the most common CTD (n = 32), followed by idiopathic inflammatory myopathies and, rarely, rheumatoid arthritis. Both groups exhibited comparable cumulative discontinuation rates due to adverse events and similar frequencies of adverse events. No significant differences were observed in maintenance doses between the two groups; however, patients in the reduced dosage group had a lower cumulative dose for up to 52 weeks than those in the standard dosage group. No significant differences were observed in changes in FVC between the two groups. Conclusion: There was no evidence for a difference between the two groups in terms of discontinuation rates, efficacy, and safety. To provide further evidence, future studies using more precise dose-escalation protocols are warranted.

    DOI: 10.1080/03009742.2024.2327159

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  • The Utility and Limitations of Universal Polymerase Chain Reaction Screening for SARS-CoV-2 During Hospital Admission

    Ogo, N; Ikegame, S; Hotta, T; Kan-o, K; Yoneshima, Y; Shiraishi, Y; Tsubouchi, K; Tanaka, K; Okamoto, I

    CUREUS JOURNAL OF MEDICAL SCIENCE   16 ( 5 )   e61470   2024.5   ISSN:2168-8184 eISSN:2168-8184

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  • Lemborexant-induced interstitial lung disease: A case report

    Nakahara, S; Ishii, Y; Egashira, R; Tsubouchi, K; Kohno, M; Takenaka, T; Tanaka, K; Okamoto, I

    RESPIROLOGY CASE REPORTS   12 ( 5 )   e01334   2024.5   ISSN:2051-3380

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    We report the first case of drug-induced interstitial lung disease attributed to lemborexant. A 66-year-old man reported to our hospital with the acute onset of cough and breathlessness with ground-glass opacity on radiological examination. Symptoms were identified after taking lemborexant for 2 consecutive days. The patient had undergone lemborexant treatment 2 years prior and had exhibited no symptoms at that time. The drug-induced lymphocyte stimulation test for lemborexant was positive. He showed rapid improvement upon treatment with steroid. With the rise in prescriptions of lemborexant for insomnia, lemborexant should be considered as a possible cause of drug-induced interstitial lung disease.

    DOI: 10.1002/rcr2.1334

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  • Exploratory mass cytometry analysis reveals immunophenotypes of cancer treatment-related pneumonitis

    Yanagihara, T; Hata, K; Matsubara, K; Kunimura, K; Suzuki, K; Tsubouchi, K; Ikegame, S; Baba, Y; Fukui, Y; Okamoto, I

    ELIFE   12   2024.4   ISSN:2050-084X

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    Anticancer treatments can result in various adverse effects, including infections due to immune suppression/dysregulation and drug-induced toxicity in the lung. One of the major opportunistic infections is Pneumocystis jirovecii pneumonia (PCP), which can cause severe respiratory complications and high mortality rates. Cytotoxic drugs and immune-checkpoint inhibitors (ICIs) can induce interstitial lung diseases (ILDs). Nonetheless, the differentiation of these diseases can be difficult, and the pathogenic mechanisms of such diseases are not yet fully understood. To better comprehend the immunophenotypes, we conducted an exploratory mass cytometry analysis of immune cell subsets in bronchoalveolar lavage fluid from patients with PCP, cytotoxic drug-induced ILD (DI-ILD), and ICI-associated ILD (ICI-ILD) using two panels containing 64 markers. In PCP, we observed an expansion of the CD16+ T cell population, with the highest CD16+ T proportion in a fatal case. In ICI-ILD, we found an increase in CD57+ CD8+ T cells expressing immune checkpoints (TIGIT+ LAG3+ TIM-3+ PD-1+), FCRL5+ B cells, and CCR2+ CCR5+ CD14+ monocytes. These findings uncover the diverse immunophenotypes and possible pathomechanisms of cancer treatment-related pneumonitis.

    DOI: 10.7554/eLife.87288

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  • Interstitial Pneumonia Associated with Nodal T-follicular Helper Cell Lymphoma: A Case Report Reviewed International journal

    Satoshi Nakamura, Tomotsugu Takano, Kousei Nakatsuru, Kazuya Tsubouchi, Takuji Yamauchi, Mikiko Hashisako, Takeshi Iwasaki, Isamu Okamoto

    Intern Med.   2024.3

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  • Therapeutic strategies to target connective tissue growth factor in fibrotic lung diseases Reviewed International journal

    Takuma Isshiki, Safaa Naiel, Megan Vierhout, Kohei Otsubo, Pareesa Ali, Kazuya Tsubouchi, Parichehr Yazdanshenas, Vaishnavi Kumaran, Anna Dvorkin-Gheva, Martin R J Kolb, Kjetil Ask

    Pharmacol Ther.   2024.1

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  • Tacrolimus and the Treatment of Pulmonary Fibrosis Reply

    Yanagihara, T; Tsubouchi, K; Kolb, MRJ

    AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE   208 ( 11 )   1242 - 1243   2023.12   ISSN:1073-449X eISSN:1535-4970

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    Language:English   Publisher:American Journal of Respiratory and Critical Care Medicine  

    DOI: 10.1164/rccm.202309-1562LE

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  • Unraveling the immunophenotypes of pneumonitis in cancer treatment through mass cytometry exploration

    Yanagihara, T; Hata, K; Matsubara, K; Kunimura, K; Suzuki, K; Tsubouchi, K; Ikegame, S; Baba, Y; Fukui, Y; Okamoto, I

    RESPIROLOGY   28   94 - 95   2023.11   ISSN:1323-7799 eISSN:1440-1843

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  • Exploring the crucial role of signal regulatory protein in airway epithelial cells

    Hata, K; Tsubouchi, K; Yanagihara, T; Eto, D; Nakatsuru, K; Suzuki, K; Kan-o, K; Okamoto, I

    RESPIROLOGY   28   39 - 40   2023.11   ISSN:1323-7799 eISSN:1440-1843

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  • Altered macrophage phenotypes in a case of autoimmune pulmonary alveolar proteinosis Reviewed International journal

    Kentaro Hata, Toyoshi Yanagihara, Keisuke Matsubara, Kazufumi Kunimura, Daisuke Eto, Kunihiro Suzuki, Kazuya Tsubouchi, Satoshi Ikegame, Yoshinori Fukui, Isamu Okamoto

    ERJ Open Res.   2023.10

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  • Mass cytometry analysis of B-cell populations in extranodal marginal-zone lymphoma of mucosa-associated lymphoid tissue of the lung Reviewed International journal

    Toyoshi Yanagihara, Kentaro Hata, Keisuke Matsubara, Kazufumi Kunimura, Kunihiro Suzuki, Kazuya Tsubouchi, Satoshi Ikegame, Yoshihiro Baba, Yoshinori Fukui, Isamu Okamoto

    Ann Hematol.   2023.10

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  • Endothelial cellular senescence contributes to the pathogenesis of IPF with pulmonary hypertension

    Otsubo, K; Tsubouchi, K; Zhou, Q; Noble, A; Ask, K; Kolb, M

    EUROPEAN RESPIRATORY JOURNAL   62   2023.9   ISSN:0903-1936 eISSN:1399-3003

  • Five-year follow up analysis of Japanese ILD registry

    Tsubouchi, K; Hamada, N; Tokunaga, S; Tsuda, T; Takata, S; Ishii, H; Kitasato, Y; Hoshino, T; Sasahara, Y; Yatera, K; Kawasaki, M; Fujita, M; Yoshida, M; Maeyama, T; Harada, T; Wataya, H; Yoshii, C; Komori, M; Mizuta, Y; Tobino, K; Harada, E; Nakanishi, Y; Okamoto, I

    EUROPEAN RESPIRATORY JOURNAL   62   2023.9   ISSN:0903-1936 eISSN:1399-3003

  • Real-world treatment outcomes of patients with penile cancer in the Kyushu-Okinawa area of Japan in the pre-guideline era

    Yamaguchi, T; Goya, M; Higashijima, K; Tobu, S; Sato, R; Tatarano, S; Mukai, S; Uemura, K; Tatsugami, K; Tsubouchi, K; Shida, Y; Ishii, T; Sakai, H; Matsuoka, H; Haga, N; Eto, M; Igawa, T; Kamoto, T; Enokida, H; Shin, T; Noguchi, M; Fujimoto, N; Saito, S; Kamba, T

    JAPANESE JOURNAL OF CLINICAL ONCOLOGY   53 ( 9 )   837 - 844   2023.8   ISSN:0368-2811 eISSN:1465-3621

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  • Acute myeloid leukemia and myelodysplastic syndrome associated with a combination of immune checkpoint inhibitor and platinum-based chemotherapy Reviewed International journal

    Kousei Nakatsuru, Kazuya Tsubouchi, Minori Hirahata, Tadayuki Nakashima, Yuriko Takahata, Yuki Okamatsu, Yoshimasa Shiraishi, Isamu Okamoto, Taishi Harada

    Thorac Cancer.   2023.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1111/1759-7714.15005.

  • Intrinsic BMP inhibitor Gremlin regulates alveolar epithelial type II cell proliferation and differentiation Reviewed International journal

    Toyoshi Yanagihara, Quan Zhou, Kazuya Tsubouchi, Spencer Revill, Anmar Ayoub, Mahsa Gholiof, Sy Giin Chong, Anna Dvorkin-Gheva, Kjetil Ask, Wei Shi, Martin Rj Kolb

    Biochem Biophys Res Commun.   2023.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Expansion of ST2-expressing macrophages in a patient with bronchiolitis obliterans syndrome Reviewed International journal

    Toyoshi Yanagihara, Kentaro Hata, Kunihiro Suzuki, Keisuke Matsubara, Kazufumi Kunimura, Kazuya Tsubouchi, Daisuke Eto, Hiroyuki Ando, Maki Uehara, Satoshi Ikegame, Yoshinori Fukui, Isamu Okamoto

    ERJ Open Res.   2023.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Mass cytometry identifies characteristic immune cell subsets in bronchoalveolar lavage fluid from interstitial lung diseases Invited Reviewed International journal

    Kentaro Hata, Toyoshi Yanagihara, Keisuke Matsubara, Kazufumi Kunimura, Kunihiro Suzuki, Kazuya Tsubouchi, Daisuke Eto, Hiroyuki Ando, Maki Uehara, Satoshi Ikegame, Yoshihiro Baba, Yoshinori Fukui, Isamu Okamoto

    Front Immunol.   2023.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Pleuroparenchymal fibroelastosis secondary to autologous peripheral blood stem cell transplantation: A case report

    Egashira A., Yoneshima Y., Mizusaki S., Tsuneoka Y., Tsubouchi K., Okamoto I.

    Respiratory Medicine Case Reports   43   101845   2023.1   ISSN:2213-0071

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    Language:English   Publisher:Respiratory Medicine Case Reports  

    Pleuroparenchymal fibroelastosis (PPFE) is a rare form of interstitial pneumonitis. Although most cases of PPFE are idiopathic, some cases of PPFE occur secondary to stem cell transplantation. We report a 41-year-old woman developed pneumonia after autologous peripheral blood system cell transplantation (PBSCT). Eleven years after PBSCT, she presented with dyspnea. A computed tomographic scan showed pleuroparenchymal thickening and predominantly in the upper lobes. She was diagnosed with PPFE secondary to PBSCT. She was started nintedanib and administered oxygen therapy. Most cases of PPFE secondary to stem cell transplantation have been reported. However, we experienced the case of PPFE post-autologous PBSCT.

    DOI: 10.1016/j.rmcr.2023.101845

    Scopus

    PubMed

  • Connective-Tissue Growth Factor Contributes to TGF-β1-induced Lung Fibrosis Invited Reviewed International journal

    Toyoshi Yanagihara, Kazuya Tsubouchi, Mahsa Gholiof, Sy Giin Chong, Kenneth E Lipson, Quan Zhou, Ciaran Scallan, Chandak Upagupta, Jussi Tikkanen, Shaf Keshavjee, Kjetil Ask, Martin R J Kolb

    Am J Respir Cell Mol Biol.   2022.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Recurrent Massive Hemothorax of Unknown Etiology in an 85-Year-Old Man

    Okamatsu, Y; Tsubouchi, K; Iwasaki, T; Nakamura, T; Nakashima, T; Nakatsuru, K; Takahata, Y; Harada, T

    CHEST   161 ( 2 )   E103 - E110   2022.2   ISSN:0012-3692 eISSN:1931-3543

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    Language:English   Publisher:Chest  

    Case Presentation: An 85-year-old Japanese man, who was taking aspirin and edoxaban for previous myocardial infarction and atrial fibrillation, came to our hospital with a chief complaint of dyspnea for 3 weeks. Chest radiography showed a massive left pleural effusion (Fig 1A). Analysis of pleural fluid showed an elevated hematocrit level at 32.8% (blood hematocrit level, 32.0%), and he was diagnosed with hemothorax. However, he had neither coagulation disorder nor thrombocytopenia, and the pleural effusion was negative for atypical cells. These findings suggested that the antithrombotic and anticoagulant medications might have induced the hemothorax.

    DOI: 10.1016/j.chest.2021.09.012

    Web of Science

    Scopus

    PubMed

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Presentations

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Research Projects

  • Overcoming acute exacerbation of interstitial lung diseases and progression of lung cancer by M2 macrophage inhibition

    Grant number:24K12016  2024.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    河野 幹寛, 竹中 朋祐, 坪内 和哉, 橋迫 美貴子, 吉住 朋晴

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    Grant type:Scientific research funding

    特発性肺線維症(IPF)は原因不明・予後不良の間質性肺炎で、高率に肺癌を合併する。IPF合併肺癌は予後不良であり、外科切除を行えたとしても術後のIPF急性増悪の発症リスクが高い。本研究の目的は、肺線維化進行・癌悪性度獲得の両者に関与していると言われているM2マクロファージのIPF合併肺癌の肺切除後IPF急性増悪ならびに発癌・癌悪性度獲得における意義を明らかにし、M2マクロファージ阻害による肺切除後IPF急性増悪の予防・治療法ならびにIPF合併肺癌の新規治療の開発を目指す。本研究により、術後IPF急性増悪の抑制・IPF合併肺癌の予後改善に向けた新たな治療戦略の確立が期待される。

    CiNii Research

  • 気道上皮細胞における signal regulatory protein α の役割の探索

    2023.9

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    Authorship:Principal investigator 

    我々は免疫細胞で強く発現することが知られているSignal Regulatory Protein α (SIRPα) が、気道の基底細胞に発現していることを見出した。しかし、これまでSIRPαが気道上皮細胞(基底細胞)において細胞内でどのようなシグナル伝達を行い、どのような機能を有しているかは明らかになっていない。本研究では、ヒト気道上皮由来基底細胞に対して遺伝子編集によりSIRPαの発現量を変化させ、細胞増殖能、細胞外マトリックス蛋白質産生能および分化能を評価し、基底細胞の細胞内機能におけるSIRPαの役割を評価する。さらに、通常気道上皮に存在するはずの基底細胞が肺胞領域に増加している特発性肺線維症におけるSIRPα陽性基底細胞の関与を明らかにし、新規治療ターゲットとなりうるかを検討する。

  • 未治療Progressive pulmonary fibrosisを対象としたニンテダニブ・抗炎症治療同時導入療法の第Ⅱ相試験

    2023.4

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    Authorship:Coinvestigator(s) 

    進行性線維化間質性肺炎(progressive pulmonary fibrosis: PPF)は、慢性かつ進行性に肺実質の線維化をきたし、さらに進行すると呼吸不全に至る予後不良な呼吸器疾患群である。PPFの背景疾患として非特異性間質性肺炎、強皮症や関節リウマチなどの自己免疫性間質性肺炎、線維性過敏性肺炎、そしてサルコイドーシスや吸入曝露による間質性肺疾患などがあり、ステロイドや免疫抑制剤といった抗炎症治療がガイドラインで推奨され広く実施されている。抗炎症治療を行っても肺の線維化の進行を抑制できない症例には抗線維化薬であるニンテダニブはが使用されているが、ニンテダニブを含む治療薬をより効果的に使用する使用方法や安全性については十分に検証されていない。ニンテダニブが肺機能が保たれた症例で肺機能低下の抑制効果が大きいというこれまでの報告を基に、今回我々は未治療のPPF症例に対して治療導入時から抗炎症治療に加えて抗線維化薬を併用することで、努力肺活量(FVC)の年間低下率をより効果的に抑制するかどうか、免疫抑制剤とニンテダニブの併用の安全性かどうかについて、検討する多施設共同前向き介入試験を行っている。全国18施設に協力いただき、実臨床で抱えるクリニカルクエスチョンを解決するため、医師主導臨床研究でのエビデンスの構築が目的としている。

  • 特発性肺線維症および合併肺高血圧症における血管内皮細胞の細胞老化の役割の解明

    2023.4

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    特発性肺線維症において、細胞老化した上皮細胞や線維芽細胞は肺線維化の発症および進展に関与しているが、細胞老化した血管内皮細胞の存在や役割については不明である。我々はこれまでの先行研究において、特発性肺線維症の肺組織を用いて細胞老化した血管内皮細胞を見出した。この知見をもとに、極めて予後の悪い特発性肺線維症および合併肺高血圧症病態における血管内皮細胞の細胞老化誘導のメカニズムや、細胞老化した血管内皮細胞による肺高血圧症の発症および肺線維化の進展への影響を明らかにすることを目的に本研究を計画した。本研究では、以下の3つを明らかにする。①線維化した肺で豊富なTransforming Growth Factor-β:TGF-βによる細胞老化誘導に着目し、老化した血管内皮細胞と血管平滑筋細胞・線維芽細胞を共培養し、肺高血圧症発症・肺線維化進展への影響を検討する。②血管形成に必要なSOX17に着目し、特発性肺線維症患者肺におけるSOX17の発現量を測定し、血管内皮細胞の細胞老化誘導および肺高血圧発症におけるSOX17の役割を明らかにする。③肺高血圧合併肺線維症動物モデルを用いて、細胞老化した血管内皮細胞の肺高血圧合併肺線維症病態への関与を明らかにし、また抗老化薬による肺高血圧症および肺線維化進展への抑制効果を検討する。

  • 特発性肺線維症および合併肺高血圧症における血管内皮細胞の細胞老化の役割の解明

    Grant number:23K15189  2023 - 2025

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Early-Career Scientists

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 進行性線維化を伴う間質性肺疾患に対するニンテダニブと抗炎症治療との併用療法の早期導入の有効性および安全性を評価するランダム化比較第3相試験

    2022.4 - 2025.4

    Joint research

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    Authorship:Coinvestigator(s)  Grant type:Other funds from industry-academia collaboration

  • オシメルチニブと免疫チェックポイント阻害薬による薬剤性間質性肺炎の病態解明

    2022.4 - 2024.3

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    Authorship:Principal investigator 

    上皮成長因子受容体(epithelial growth factor receptor: EGFR)チロシンキナーゼ阻害薬と免疫チェックポイント阻害薬は、進行肺癌の生存期間を延長させたが、時に致死的な薬剤性間質性肺炎を引き起こすことが大きな問題となっている。本研究では、EGFRチロシンキナーゼ阻害薬:オシメルチニブと免疫チェックポイント阻害薬を用いて、薬剤性間質性肺炎モデルを作成する。薬剤性肺炎患者の気管支肺胞洗浄液で増加しているT細胞に注目して解析し、薬剤性肺炎病態におけるT細胞の役割を明らかにする。また、そのT細胞が肺の線維化形成に重要な上皮細胞・線維芽細胞や筋線維芽細胞へどのように影響するかを検討する。これらの知見を実際のヒト薬剤性間質性肺炎症例の気管支肺胞洗浄液や肺組織を用いて解析する。これらの本研究により、薬剤性間質性肺炎の病態解明やリスク予測、新規治療法の開発に繋がることが期待される。

  • Surfactant protein D (SP-D)による気道杯細胞の​粘液分泌過多の制御

    2022.4 - 2024.3

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    過剰なムチン分泌は喘息や慢性閉塞性肺疾患といった慢性気道疾患において共通の特徴であり、疾患増悪の要因となっている。また、サーファンクタントプロテインD(SP-D)は免疫細胞へ作用して気道疾患を予防するが、気道上皮細胞に対して直接的な作用を示すかどうかは不明であった。本研究では気道上皮細胞におけるムチン産生に対してSP-Dがどのような直接的な作用を示すか、またその作用機序は何かについて、ヒト初代気道上皮細胞(HBEC)を用いたin vitroの研究と動物マウスモデルを用いたin vivoの研究を行い検証した。タバコの煙に含まれる主要な毒性物質であるベンゾピレン(BaP)はヒト気道上皮モデル、気道分泌細胞株およびマウスの気道上皮においてムチン5AC(MUC5AC)産生を誘導し、BaPによるムチンの過剰産生に対してSP-Dは保護作用を示した。HBECにおいてSP-Dと結合するシグナル制御タンパク質α(SIRPα)が発現することを見出し、SP-Dが気道上皮細胞に直接作用しSIRPαへの結合を介してムチンの分泌を抑制することを示した。SIRPαを標的とすることは慢性閉塞性肺疾患や喘息などの慢性気道疾患におけるムチン分泌過多を抑制する新しい治療法となる可能性があると考えている。

  • オシメルチニブと免疫チェックポイント阻害薬による薬剤性間質性肺炎の病態解明

    Grant number:22K20889  2022 - 2023

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity start-up

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    Authorship:Principal investigator  Grant type:Scientific research funding

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Educational Activities

  • Clinical training and education for medical students.
    Clinical education and teaching for residents and medical staff.
    Research guidance for PhD students.

Class subject

  • 令和7年度 臨床医学Ⅲ-②(医歯薬合同講義

    2025.4 - 2025.9   First semester

  • 令和6年度 臨床医学Ⅲ-②(医歯薬合同講義

    2024.4 - 2024.9   First semester

  • 3学年系統医学Ⅱ

    2024.4 - 2024.9   First semester

  • 令和5年度 臨床医学Ⅲ-②(医歯薬合同講義

    2023.4 - 2023.9   First semester

  • 3学年系統医学Ⅱ

    2023.4 - 2023.9   First semester

Outline of Social Contribution and International Cooperation activities

  • 間質性肺疾患の早期発見を目指した開業医を対象とした疾患啓発活動

Specialized clinical area

  • Biology / Medicine, Dentistry and Pharmacy / Internal Medicine / Respiratory Medicine

Clinician qualification

  • Preceptor

    The Japanese Respiratory Society

  • Preceptor

    The Japan Society for Respiratory Endoscopy(JSRE)

  • Specialist

    The Japanese Society of Internal Medicine(JSIM)

  • Specialist

    The Japanese Association for Infectious Diseases

Year of medical license acquisition

  • 2007

Notable Clinical Activities

  • びまん性肺疾患の治療についてのセカンドオピニオンを行い、患者さんへの治療選択肢の提示等を行っている。 びまん性肺疾患・感染症カンファレンスでの詳細な症例検討を行い、実臨床に反映される体制づくりに貢献する。