2025/04/04 更新

写真a

ナカニシ ケイタ
仲西 慶太
NAKANISHI Keita
所属
医学部附属病院 呼吸器外科 病院助教
職名
病院助教
 

論文 41

  1. Lobectomy for primary lung cancer: a comparison of perioperative and postoperative outcomes between robot-assisted thoracic surgery and video-assisted thoracic surgery Open Access

    Ueno, H; Imamura, Y; Okado, S; Nomata, Y; Watanabe, H; Kawasumi, Y; Nakanishi, K; Kadomatsu, Y; Kato, T; Nakamura, S; Mizuno, T; Chen-Yoshikawa, TF

    SURGERY TODAY     2025年2月

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    記述言語:英語   出版者・発行元:Surgery Today  

    Purpose: This study compared the peri- and postoperative outcomes of robot-assisted thoracic surgery (RATS) and video-assisted thoracic surgery (VATS) lobectomy for primary lung cancer. Methods: This retrospective cohort study included patients who underwent RATS or VATS at Nagoya University Hospital between April 2018 and March 2022. Propensity score matching was used to balance patient characteristics between the two groups. The following long-term outcomes were assessed: the 3-year overall survival (OS), causes of death, 3-year disease-free survival (DFS), and recurrence patterns. Various peri- and postoperative outcomes were examined as short-term outcomes. Results: After propensity score-matching, 137 patients were included in each group. RATS was associated with a longer operative time (median 180 vs. 144 min, p < 0.001), less blood loss (median 5 vs. 12 ml, p = 0.005), and a lower rate of conversion to open thoracotomy (1 [0.7%] vs. 10 [7.4%], p = 0.010) than VATS. The 3-year OS and DFS were comparable between the groups. Conclusion: In lobectomy for lung cancer, RATS demonstrated long-term outcomes that were comparable to those of VATS. Although RATS has a longer operative time, it is associated with less blood loss and a lower conversion rate to open thoracotomy than VATS, suggesting that it is a beneficial surgical approach for patients.

    DOI: 10.1007/s00595-025-03000-6

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  2. The impact of restricted chests on long-term lung function parameters following lung transplantation in patients with interstitial lung disease

    Nakanishi, K; Schweiger, T; Schwarz, S; Taghavi, S; Hillebrand, C; Begic, M; Auner, S; Boehm, PM; Mosleh, B; Jaksch, P; Benazzo, A; Chen-Yoshikawa, TF; Hoetzenecker, K

    EUROPEAN JOURNAL OF CARDIO-THORACIC SURGERY   67 巻 ( 1 )   2025年1月

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    記述言語:英語   出版者・発行元:European Journal of Cardio-thoracic Surgery  

    OBJECTIVES: In patients with interstitial lung disease (ILD), the diaphragm typically rises as the lungs chronically shrink. However, the grade of restriction differs in each patient. It is currently unknown, how disparities between actual and predicted recipient total lung capacity (TLC), impact changes in lung function parameters and long-term outcomes following lung transplantation (LTx). METHODS: This retrospective study included 170 LTx for the patients with ILD performed in a European high-volume LTx center between 09/2011 and 12/2022. The preoperative median ratio of recipient actual to predicted (a/p) TLC was 0.55. Patients were stratified into two groups: low a/p TLC ratio group, corresponding to a more restricted chest cavity (<0.55: n = 85), and high a/p TLC ratio group, corresponding to a more preserved chest cavity (≥0.55: n = 85). Perioperative and long-term outcomes, including lung function and overall survival, were analysed. RESULTS: Between the two groups, tracheostomy and reintubation rates, length of mechanical ventilation, ICU-stay and hospital-stay were not significantly different. Although lung function measurements obtained early after LTx were better in the high a/p TLC ratio group, no significant differences were observed in the long term. Five-year overall survival was not significantly different between the two groups. CONCLUSIONS: Although LTx for ILD patients with a restricted chest is considered technically more challenging, the perioperative course is similar to ILD patients with a preserved chest. In addition, no significant differences were observed between both groups in long-term lung function and overall survival, suggesting an improvement in chest wall compliance.

    DOI: 10.1093/ejcts/ezae465

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  3. Development of a machine learning-based risk model for postoperative complications of lung cancer surgery Open Access

    Kadomatsu, Y; Emoto, R; Kubo, Y; Nakanishi, K; Ueno, H; Kato, T; Nakamura, S; Mizuno, T; Matsui, S; Chen-Yoshikawa, TF

    SURGERY TODAY   54 巻 ( 12 ) 頁: 1482 - 1489   2024年12月

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    記述言語:英語   出版者・発行元:Surgery Today  

    Purpose: To develop a comorbidity risk score specifically for lung resection surgeries. Methods: We reviewed the medical records of patients who underwent lung resections for lung cancer, and developed a risk model using data from 2014 to 2017 (training dataset), validated using data from 2018 to 2019 (validation dataset). Forty variables were analyzed, including 35 factors related to the patient’s overall condition and five factors related to surgical techniques and tumor-related factors. The risk model for postoperative complications was developed using an elastic net regularized generalized linear model. The performance of the risk model was evaluated using receiver operating characteristic curves and compared with the Charlson Comorbidity Index (CCI). Results: The rate of postoperative complications was 34.7% in the training dataset and 21.9% in the validation dataset. The final model consisted of 20 variables, including age, surgical-related factors, respiratory function tests, and comorbidities, such as chronic obstructive pulmonary disease, a history of ischemic heart disease, and 12 blood test results. The area under the curve (AUC) for the developed risk model was 0.734, whereas the AUC for the CCI was 0.521 in the validation dataset. Conclusions: The new machine learning model could predict postoperative complications with acceptable accuracy. Clinical registration number: 2020–0375.

    DOI: 10.1007/s00595-024-02878-y

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  4. Incidence of air leaks in patients undergoing robotic thoracic surgery and video-assisted thoracic surgery Open Access

    Ueno, H; Takada, Y; Imamura, Y; Okado, S; Nomata, Y; Watanabe, H; Nakanishi, K; Kadomatsu, Y; Kato, T; Nakamura, S; Mizuno, T; Chen-Yoshikawa, TF

    NAGOYA JOURNAL OF MEDICAL SCIENCE   86 巻 ( 3 ) 頁: 464 - 471   2024年8月

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    記述言語:英語   出版者・発行元:Nagoya Journal of Medical Science  

    Postoperative air leakage is the most common complication in surgery for malignant lung tumors, leading to extended hospital stays and substantial medical expenses. This study aimed to identify the incidence and characteristics of intraoperative and postoperative air leaks in both robotic-assisted thoracic surgery (RATS) and video-assisted thoracic surgery (VATS), as well as the causes of persistent air leakage following RATS. We conducted a retrospective analysis of patients who underwent lung resection for malignant lung tumors at our institution from October 2018 to August 2022. We compared the incidence rates of intraoperative air leak, postoperative air leak, and persistent air leak between patients who underwent RATS and those who underwent VATS. Background factors were adjusted using propensity score matching. A subanalysis was performed to compare unexpected air leaks, defined as air leaks not observed intraoperatively but confirmed postoperatively. The study included 295 cases of RATS and 227 cases of VATS. In both the overall population and the matched group (187 cases each for RATS and VATS), RATS demonstrated a significantly higher incidence of persistent air leaks compared to VATS (11% vs 3%, p < 0.01; 9% vs 3%, p = 0.02, respectively). RATS also had a significantly higher incidence of unexpected air leaks compared with VATS (29% vs 18%, p = 0.05). Although there was no statistically significant difference in hospital stays, RATS showed a higher incidence of postoperative persistent air leaks and unexpected postoperative air leaks than VATS.

    DOI: 10.18999/nagjms.86.3.464

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  5. Efficacy of Immune Checkpoint Inhibitors in Postoperative Recurrence of Wild-type EGFR Non-Small Cell Lung Cancer

    Imamura, Y; Kato, T; Nomata, Y; Okado, S; Watanabe, H; Kawasumi, Y; Nakanishi, K; Kadomatsu, Y; Ueno, H; Nakamura, S; Mizuno, T; Hase, T; Tanaka, I; Ishii, M; Yatsuya, H; Chen-yoshikawa, TF

    ANTICANCER RESEARCH   44 巻 ( 8 ) 頁: 3451 - 3461   2024年8月

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    記述言語:英語   出版者・発行元:Anticancer Research  

    Background/Aim: Immune checkpoint inhibitors (ICIs) have been widely used in the treatment of non-small cell lung cancer (NSCLC), but specific outcomes of ICIs treatment among patients with postoperative recurrence of NSCLC remain unclear. The objective of the study was to compare the efficacy of ICIs and chemotherapy with conventional chemotherapy only in patients with postoperative recurrence of epidermal growth factor receptor (EGFR) wild-type NSCLC. Patients and Methods: A retrospective analysis was performed on patients who underwent anatomical lung resection at the Nagoya University Hospital and were treated for postoperative recurrence of wild-type EGFR NSCLC. This study evaluated the prognosis for postoperative recurrence, including ICIs treatment and other clinicopathological factors. Results: Of the 83 patients included in the analysis, 20 patients underwent chemotherapy and 63 patients underwent chemotherapy combined with ICIs. The combination of ICIs and chemotherapy significantly prolonged survival after recurrence (median survival: 33.1 months vs. 22.0 months, p=0.01). In the ICIs group, no significant differences in survival were detected between patients with different programmed death ligand 1 (PD-L1) status (Tumor Proportion Scores: <1%, 1%-49%, ≥50%, p=0.27). Multivariate analysis revealed that postoperative distant recurrence was a significant poor prognostic factor for survival after recurrence (HR=1.85, 95% CI=1.06-3.25, p=0.03), and combining ICIs with chemotherapy significantly improved survival after recurrence (HR=0.43, 95% CI=0.24-0.78, p<0.01). Conclusion: Combination of ICIs with chemotherapy significantly prolonged survival of postoperative recurrence with wild-type EGFR NSCLC regardless of PD-L1 status.

    DOI: 10.21873/anticanres.17165

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  6. Thoracoscopic Wedge Resection for Low-Grade Fibromyxoid Sarcoma (Evans Tumor) with Massive Calcification and Originating from the Lung: A Rare Case in an Unexpected Location Open Access

    Watanabe, H; Nakanishi, K; Ueno, H; Kato, T; Shimoyama, Y; Chen-Yoshikawa, TF

    ANNALS OF THORACIC AND CARDIOVASCULAR SURGERY   30 巻 ( 1 ) 頁: n/a   2024年2月

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    記述言語:英語   出版者・発行元:Annals of Thoracic and Cardiovascular Surgery 編集委員会  

    We encountered a rare case of low-grade fibromyxoid sarcoma, which is generally known as Evans tumor, with massive calcification originating from the lung. The patient was a 22-year-old man with Duchenne muscular dystrophy who was referred for a detailed investigation of an intrathoracic tumor with massive calcification. Although our preoperative diagnosis was a solitary fibrous tumor originating from the mediastinum or diaphragm, intraoperative thoracoscopy revealed the tumor arising from the left lower lobe without adhesion to the other organs. Considering his medical history, we aimed to preserve lung function and chose wedge resection, which completely removed the tumor. Based on the pathological findings, the tumor was diagnosed as low-grade fibromyxoid sarcoma with massive calcification originating from the lung. Although extremely rare, this tumor should be considered as a differential diagnosis for a solitary lung mass with massive calcification in young adults.

    DOI: 10.5761/atcs.cr.23-00170

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  7. The Impact of Expanded Indication of Robot-Assisted Thoracic Surgery for Mediastinal Tumors

    Kato, T; Takada, Y; Iwashimizu, H; Imamura, Y; Okado, S; Nomata, Y; Watanabe, H; Noritake, O; Nakanishi, K; Kadomatsu, Y; Ueno, H; Nakamura, S; Mizuno, T; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC ONCOLOGY   18 巻 ( 11 ) 頁: S721 - S721   2023年11月

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  8. The Prognostic Impact of Postoperative EGFR Mutation Status in Lung Cancer Patients with Stage II - III

    Nakamura, S; Hase, T; Takada, Y; Iwashimizu, H; Imamura, Y; Okado, S; Nomata, Y; Watanabe, H; Noritake, O; Nakanishi, K; Kadomatsu, Y; Ueno, H; Kato, T; Mizuno, T; Ishii, M; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC ONCOLOGY   18 巻 ( 11 ) 頁: S489 - S490   2023年11月

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  9. Complete visualization using indocyanine green in thoracic surgery for pulmonary sequestration Open Access

    Nakanishi, K; Kadomatsu, Y; Ueno, H; Kato, T; Nakamura, S; Mizuno, T; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC DISEASE   15 巻 ( 10 ) 頁: 5714 - +   2023年10月

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    記述言語:英語   出版者・発行元:Journal of Thoracic Disease  

    Preoperative three-dimensional computed tomography (CT) facilitates accurate identification of aberrant systemic arteries in thoracic surgery for pulmonary sequestration (PS). Furthermore, the boundary between normal and sequestrated lungs can be visualized using the spread of fluorescent indocyanine green (ICG) when performing surgery for PS. This study aimed to determine how to completely visualize anatomical variations, safely treat aberrant arteries, remove only sequestrated lungs, and perform minimally invasive surgery for PS. Seventeen patients underwent lung resection for intralobar PS at our institution between 2009 and 2022. We retrospectively reviewed the surgical outcomes and intraoperative images using ICG to assess the efficacy and feasibility of near-infrared fluorescence imaging. Since 2019, intraoperative near-infrared fluorescence imaging with ICG has been used in six patients, including four females and two males (median age, 56 years), to visualize the boundary between normal and sequestrated lungs. Aberrant arteries were identified using preoperative three-dimensional CT, and the boundary between sequestrated and normal lungs could be clearly delineated intraoperatively using ICG in all cases. The median operative time was 145 min (range, 88–167 min), and the median blood loss was 5 mL (range, 1–191 mL). The overlay mode using near-infrared thoracoscopy, which merges visible light images with fluorescent images, was safer and more useful than conventional thoracoscopy for delineating boundaries with electrocautery. No intraoperative or postoperative complications occurred. The median postoperative hospital stay was 5 days (range, 3–7 days). Intraoperative identification of the boundary between normal and sequestrated lungs using ICG was simple and feasible. We suggested that this technique was effective for lesion resection and normal lung preservation during surgery for intralobar PS.

    DOI: 10.21037/jtd-23-892

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  10. Prognostic impact of highly solid component in early-stage solid lung adenocarcinoma Open Access

    Kato, T; Iwano, S; Hanamatsu, Y; Nakaguro, M; Emoto, R; Okado, S; Sato, K; Noritake, O; Nakanishi, K; Kadomatsu, Y; Ueno, H; Ozeki, N; Nakamura, S; Fukumoto, K; Takeuchi, T; Karube, K; Matsui, S; Chen-Yoshikawa, TF

    QUANTITATIVE IMAGING IN MEDICINE AND SURGERY   13 巻 ( 9 ) 頁: 5641 - +   2023年9月

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    記述言語:英語   出版者・発行元:Quantitative Imaging in Medicine and Surgery  

    Background: Based on computed tomography (CT) findings of lung cancer, solid nodules have a much worse prognosis than subsolid nodules, even if the nodules are subcentimeter in size. There is, however, no systematic method for determining the prognosis of solid tumors on CT. This study aimed to discover the prognostic factor of early-stage solid lung adenocarcinoma using three-dimensional CT volumetry. Methods: Patients with pathological stage I solid lung adenocarcinoma who underwent complete resection between 2007 and 2012 were selected in this retrospective study. Clinicopathological data and preoperative multidetector CT findings, such as tumor size on the two-dimensional axial image, three-dimensional tumor volume between -600 and 199 HU, and three-dimensional solid volume between 0 and 199 HU, which corresponded to highly solid components, were compared between recurrence and non-recurrence. Furthermore, these radiological values were compared to pathological invasive volume (PIV). Results: During this time, 709 patients had their lung cancer completely removed. From this cohort, 90 patients with pathological stage I solid lung adenocarcinoma were selected. In addition, recurrence was found in 26 patients (28.9%). Although two-dimensional axial image, serum carcinoembryonic antigen (CEA) level, and SUVmax on 18F fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/ CT) did not differ statistically between recurrent and non-recurrent patients, three-dimensional tumor and solid tumor volume did. Multivariate analysis indicated that three-dimensional solid tumor volume [hazard ratio: 2.440; 95% confidence interval (CI): 1.110-5.361, P=0.026] and epidermal growth factor receptor (EGFR) mutation (hazard ratio: 4.307; 95% CI: 1.328-13.977, P=0.015) were significantly associated with disease-free survival (DFS). When three-dimensional tumor and solid tumor volume were compared to PIV, three-dimensional solid tumor volume (3,091 mm3 on average) showed a highly similar value with PIV (2,930 mm3 on average), whereas three-dimensional tumor volume (6,175 mm3 on average) was significantly larger than PIV (P<0.001). Conclusions: In patients with early-stage solid lung adenocarcinoma, the measurement of threedimensional solid tumor volume, which is correlated with PIV, accurately predicted the postoperative outcome.

    DOI: 10.21037/qims-23-36

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  11. [Robot-assisted Extended Thymectomy via a Bilateral Approach for Patients with Myasthenia Gravis].

    Nakamura S, Nakanishi K, Kadomatsu Y, Ueno H, Kato T, Chen-Yoshikawa TF

    Kyobu geka. The Japanese journal of thoracic surgery   76 巻 ( 7 ) 頁: 523 - 527   2023年7月

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    記述言語:日本語  

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  12. Lingular-segment torsion after extended left-upper division segmentectomy by video-assisted thoracic surgery with indocyanine green fluorescence imaging

    Kato, T; Ohara, Y; Okado, S; Noritake, O; Nakanishi, K; Kadomatsu, Y; Ueno, H; Nakamura, S; Fukumoto, K; Chen-Yoshikawa, TF

    ASIAN JOURNAL OF ENDOSCOPIC SURGERY   16 巻 ( 3 ) 頁: 584 - 587   2023年7月

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    記述言語:英語   出版者・発行元:Asian Journal of Endoscopic Surgery  

    Lingular-segment torsion after left-upper division segmentectomy (LUDS) is a rare complication, and the cause remains unclear. Here we report the case of a patient who developed lingular-segment torsion after LUDS for multiple lung metastases of breast cancer. One lung nodule was located in the S1 + 2 segment and another between the upper lobe and S6 on an incomplete interlobar fissure. The lung metastases were resected by extended LUDS using video-assisted thoracic surgery with indocyanine green fluorescence imaging. The staple line on the lingular segment was vertically tilted against the interlobar line because of the atypical defect of the fluorescence plane and nodule position. Chest X-ray and contrast-enhanced computed tomography indicated ischemia and torsion of the lingular segment on the second postoperative day, and completion of lingular segmentectomy was performed. This case showed the vertical intersegment staple line during LUDS was one of the important causes of postoperative torsion of the lingular segment.

    DOI: 10.1111/ases.13189

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  13. Real-world evidence of safety and influence for lung cancer surgery under COVID-19 pandemic in Japan Open Access

    Kato, T; Katsuya, R; Okado, S; Sato, K; Noritake, O; Nakanishi, K; Noguchi, M; Kadomatsu, Y; Ueno, H; Ozeki, N; Nakamura, S; Fukumoto, K; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC DISEASE   15 巻 ( 2 ) 頁: 542 - +   2023年2月

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    記述言語:英語   出版者・発行元:Journal of Thoracic Disease  

    Background: The COVID-19 pandemic has affected the clinical practice of lung cancer surgery in Japan, but few studies have revealed the real situation of surgical practice for lung cancer in this country. This latest information will help us to decide the future direction of lung cancer surgery under pandemic circumstances. Methods: We collected data from patients with primary lung cancer who underwent thoracic surgery between 2018 and 2021. To investigate the impact of the COVID-19 pandemic on lung cancer surgery, we compared between 2018–2019 (prepandemic group) and 2020–2021 (pandemic group) in the respect of patient characteristics, pathological findings, and short-term outcome after lung cancer resection by Mann-Whitney and Fisher’s exact tests. Moreover, the monthly number of surgeries for lung cancer in our institution during 2020–2021 was compared with the number of newly diagnosed COVID-19 patients in Japan by Spearman correlation analysis. Results: From 2018 through 2021, 936 patients with primary lung cancer underwent surgical intervention in our institute and were included in this study. The number of surgeries did not decrease in the pandemic group (n=443) compared with that in the prepandemic group (n=493). Tumor and invasive size in stage I which was measured by pathologist were significantly larger in the pandemic group than in the prepandemic group (tumor size: P=0.031, invasive size: P<0.001). In terms of postoperative short-term outcome, the median hospital stay was 6 days, 30-day mortality was 2, and morbidity was around 20% in both groups. Only one patient suffered from COVID-19 infection 5 months after right upper lobectomy. An increased ratio of newly diagnosed COVID-19 cases in Japan was negatively correlated with the number of surgeries for lung cancer in our institution in the next month (r=−0.393, P=0.007), although there was no correlation in the present or the month after next. Conclusions: Even during the COVID-19 pandemic period, lung cancer surgery could be performed safely and in a sustainable manner. However, pathological findings of lung cancer tended to be progressive in early-stage lung cancer.

    DOI: 10.21037/jtd-22-1289

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  14. Computer-Aided Volumetry by Multidetector Computed Tomography is Efficient for Prognostic Prediction of Early-Stage Solid Lung Cancers

    Kato, T; Iwano, S; Katsuya, R; Okado, S; Ito, T; Sato, K; Nakanishi, K; Kadomatsu, Y; Ueno, H; Ozeki, N; Nakamura, S; Fukumoto, K; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC ONCOLOGY   17 巻 ( 9 ) 頁: S206 - S207   2022年9月

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  15. Skeletal muscle and related protein expression as prognostic factors in thymic squamous cell carcinoma Open Access

    Nakanishi, K; Ozeki, N; Tateyama, H; Kadomatsu, Y; Ueno, H; Goto, M; Nakamura, S; Fukumoto, K; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC DISEASE   14 巻 ( 9 ) 頁: 3245 - 3254   2022年9月

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    記述言語:英語   出版者・発行元:Journal of Thoracic Disease  

    Background: Sarcopenia and its marker, the psoas muscle index (PMI), have attracted attention as prognostic factors for various types of cancers. The fragile X-related 1 (FXR1) gene is highly expressed in myocytes, and FXR1 overexpression is a candidate biomarker for poor survival in several types of cancers. Thymic squamous cell carcinoma (TSQCC) is rare, and no studies assessing its prognostic factors, particularly in terms of skeletal muscle mass and FXR1 expression, are available. Methods: We retrospectively investigated the prognostic significance of PMI in 34 patients who underwent TSQCC resection, considering the status of FXR1 and tumor programmed death-ligand 1 (PD-L1). PMI was calculated from the bilateral psoas muscle using preoperative computed tomography (CT). Patients were divided into two groups: low PMI (<58.2%, n=17) and normal PMI (≥58.2%, n=17). Immunohistochemical analysis was performed to determine the FXR1 and PD-L1 expression levels. Results: Low PMI was significantly associated with worse overall survival (OS) (5-year survival rate; 86% vs. 100%; P=0.026) and marginally associated with worse disease-free survival (DFS) (5-year survival rate; 39% vs. 66%; P=0.090) compared with normal PMI. The immunohistochemical analysis revealed that the FXR1 intensity score (0–1+: 6% vs. 0%; 2+–3+: 94% vs. 100%; P=0.31), median FXR1 distribution (95% vs. 90%; P=0.63), and PD-L1 status (high: 47% vs. 59%; P=0.49) were not significantly different between the two groups. Conclusions: Our findings suggest that PMI might be considered as a potential prognostic factor in TSQCC and that FXR1 is widely expressed regardless of the PMI status. Skeletal muscle mass may play a role in the prognosis of TSQCC.

    DOI: 10.21037/jtd-22-385

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  16. Relationship of smoking cessation period with the incidence of complications in lung cancer surgery Open Access

    Kadomatsu, Y; Sugiyama, T; Sato, K; Nakanishi, K; Ueno, H; Goto, M; Ozeki, N; Nakamura, S; Fukumoto, K; Chen-Yoshikawa, TF

    EUROPEAN JOURNAL OF CARDIO-THORACIC SURGERY   62 巻 ( 3 )   2022年8月

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    記述言語:英語   出版者・発行元:European Journal of Cardio-thoracic Surgery  

    OBJECTIVES: The incidence of postoperative complications is relatively high in smokers. Although 4-week smoking cessation before surgery is generally recommended, it has not been sufficiently studied in lung cancer surgery. This study investigated whether smoking cessation for a short period of time significantly reduced complications after lung cancer surgery. METHODS: This was a retrospective, observational study that investigated the relationship between the smoking cessation period and the incidence of complications in lung cancer surgery. Patients who underwent curative-intent surgery for lung cancer at our institution between January 2014 and December 2017 were included. The smokers were classified into the following 4 categories of smoking cessation period before surgery: current (<4 weeks), recent (4 weeks to 12 months), distant (12 months to 5 years) and ex-smokers (>5 years). RESULTS: A total of 911 patients were included in this study. The incidence of pulmonary complications was 5 times higher in the smoker group than in the never smoker group (12.9% vs 2.5%, P < 0.001). On multivariable analysis in both models, the odds ratio for complications was significantly higher in distant smokers than in recent smokers and never smokers. Across all models, low lung function significantly predicted the development of postoperative complications. CONCLUSIONS: The evidence-based smoking cessation duration that reduces the incidence of complications after thoracic surgery remains unclear. The incidence of postoperative complications was more strongly affected by low pulmonary function than by the duration of preoperative smoking cessation. For patients with marginal indications for surgery, postponing surgery to accommodate a smoking cessation period seemed unnecessary.

    DOI: 10.1093/ejcts/ezac163

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  17. Commentary: To know yourself is to know your neighbor Open Access

    Nakanishi, K; Chen-Yoshikawa, TF

    JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY   163 巻 ( 6 ) 頁: 1988 - 1989   2022年6月

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    記述言語:英語   出版者・発行元:Journal of Thoracic and Cardiovascular Surgery  

    DOI: 10.1016/j.jtcvs.2021.01.030

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  18. ASO Visual Abstract: Pleural Invasion Depth of Disseminated Nodules in Patients with Stage IVa or Recurrent Thymoma: Assessment, Curative Impact, and Surgical Outcomes

    Nakamura, S; Tateyama, H; Nakanishi, K; Sugiyama, T; Kadomatsu, Y; Ueno, H; Goto, M; Ozeki, N; Fukui, T; Yokoi, K; Chen-Yoshikawa, TF

    ANNALS OF SURGICAL ONCOLOGY   29 巻 ( 3 ) 頁: 1838 - 1838   2022年3月

  19. Pleural Invasion Depth of Disseminated Nodules in Patients with Stage IVa or Recurrent Thymoma: Assessment, Curative Impact, and Surgical Outcomes

    Nakamura, S; Tateyama, H; Nakanishi, K; Sugiyama, T; Kadomatsu, Y; Ueno, H; Goto, M; Ozeki, N; Fukui, T; Yokoi, K; Chen-Yoshikawa, TF

    ANNALS OF SURGICAL ONCOLOGY   29 巻 ( 3 ) 頁: 1829 - 1837   2022年3月

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    記述言語:英語   出版者・発行元:Annals of Surgical Oncology  

    Background: Thymoma patients with pleural dissemination are difficult to manage, and their treatment strategy remains undefined. This study aimed to investigate the clinicopathologic features of these patients, focusing on the association between the depth of pleural invasion and prognosis. Methods: Between 2003 and 2019, the study identified 120 disseminated lesions in 20 thymoma patients. Seven patients had de novo stage IVa thymoma and 13 were recurrent cases. Extrapleural pneumonectomy was performed for 8 patients and debulking surgery for 12 patients. Invasion depth of pleural tumors was classified into two groups: when the disseminated tumors invaded the pleura beneath the elastic layer, the tumor was diagnosed as Da, and when the disseminated tumors invaded the pleura beyond the elastic layer, the tumor was diagnosed as Db. Results: Of 120 nodules, 31 (26%), found in eight patients with recurrent malignancies, were classified as Db. The pathologic status of the surgical margin (PSM) was positive in eight patients, seven of whom had Db nodules. The 5-year overall survival (OS) rate was 100% in the Da group and 75% in the Db group (P = 0.02). The 5-year progression-free survival (PFS) rate was 66.7% in the Da group and 25% in the Db group (P = 0.02). Cox univariate analysis showed that PFS was significantly influenced by the depth of invasion (P = 0.04) and PSM (P = 0.03). Conclusion: Depth of pleural invasion may influence survival outcomes for thymoma patients with pleural dissemination. The patients in this study with Da-disseminated nodules had an increased probability of a longer OS and PFS and tended to achieve negative PSM compared with the patients with Db.

    DOI: 10.1245/s10434-021-10888-0

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  20. Removal of hematoma due to massive hemoptysis after transbronchial biopsy: a case report

    Ueno, H; Tsubouchi, H; Nakanishi, K; Sugiyama, T; Kadomatsu, Y; Goto, M; Ozeki, N; Nakamura, S; Fukui, T; Chen-Yoshikawa, TF

    SURGICAL CASE REPORTS   7 巻 ( 1 ) 頁: 237   2021年11月

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  21. Comparison of Surgical Outcomes Between Invasive Mucinous and Non-Mucinous Lung Adenocarcinoma

    Matsui, T; Sakakura, N; Koyama, S; Nakanishi, K; Sasaki, E; Kato, S; Hosoda, W; Murakami, Y; Kuroda, H; Yatabe, Y

    ANNALS OF THORACIC SURGERY   112 巻 ( 4 ) 頁: 1118 - 1126   2021年10月

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    記述言語:英語   出版者・発行元:Annals of Thoracic Surgery  

    Background: Invasive mucinous adenocarcinoma (IMA) is a rare subtype of invasive lung adenocarcinoma. However, the clinical course and prognostic outcomes following IMA resection, particularly postoperative recurrence, remain unclear. Methods: We pathologically reevaluated 1362 lung adenocarcinoma resections performed at our institution, categorizing cases into the IMA group (72 cases) and non-IMA group (1290 cases). The IMA group was further classified into pneumonia and nodular types based on preoperative computed tomography. Results: Overall, the IMA group had lower carcinoembryonic antigen levels (3 vs 8 ng/mL; P < .01), fewer lymph node metastasis (4% vs 24%; P < .01), and more KRAS mutations (56% vs 7%; P < .01) than the non-IMA group. Although postoperative recurrence rates did not differ between both groups (32% vs 27%; P = 0.35), lung recurrence occurred more frequently in the IMA group (83% vs 17%; P < .01). Propensity score-matched pair analysis showed that the IMA group had fewer lymph node metastasis (3% vs 35%; P < .01), more KRAS mutations (56% vs 9%; P < .01), and higher intrapulmonary recurrence rate (84% vs 31%; P < .01) than the non-IMA group. The 5-year overall survival rates did not differ between both groups (74% vs 81%; P = 0.26). However, among patients with intrapulmonary recurrence, those in the IMA group had significantly worse prognosis than those in the non-IMA group (35% vs 77%; P < .01). Conclusions: Intrapulmonary recurrence, which induced significantly worse prognosis, was more likely to occur in the IMA than non-IMA group.

    DOI: 10.1016/j.athoracsur.2020.09.042

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  22. Diagnostic utility of metabolic parameters on FDG PET/CT for lymph node metastasis in patients with cN2 non-small cell lung cancer Open Access

    Nakanishi, K; Nakamura, S; Sugiyama, T; Kadomatsu, Y; Ueno, H; Goto, M; Ozeki, N; Fukui, T; Iwano, S; Chen-Yoshikawa, TF

    BMC CANCER   21 巻 ( 1 ) 頁: 983   2021年9月

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    記述言語:英語   出版者・発行元:BMC Cancer  

    Background: The aim of this study was to assess the diagnostic utility of metabolic parameters on fluorine-18-fluoro-2-deoxy-D-glucose-positron emission tomography (FDG-PET)/computed tomography (CT) for predicting lymph node (LN) metastasis in patients with cN2 non-small cell lung cancer (NSCLC). Methods: We retrospectively reviewed patients who underwent surgery for cN2 NSCLC between 2007 and 2020. Those who had clinically diagnosed positive hilar and mediastinal LNs by routine CT and PET/CT imaging were investigated. To measure the metabolic parameters of LNs, the data according to maximum standardized uptake value (SUVmax), metabolic tumor volume (MTV), total lesion glycolysis (TLG), and LN-to-primary tumor ratio of SUVmax (LPR) were examined. The diagnosis of each retrieved LN was confirmed based on histopathological examination of surgical tissue specimens. Receiver operating characteristics (ROC) curves with area under the curve (AUC) calculations and multivariate analysis by logistic regression were performed. Results: Forty-five patients with 84 clinically diagnosed positive hilar or mediastinal LNs were enrolled in the present study. Of the 84 LNs, 63 LNs were pathologically proven as positive (75%). The SUVmax, MTV, TLG, and LPR of LN metastasis were significantly higher than those of benign nodes. In the ROC analysis, the AUC value of LPR [AUC, 0.776; 95% confidence interval (CI), 0.640–0.913] was higher than that of LN SUVmax (AUC, 0.753; 95% CI, 0.626–0.880) or LN TLG3.5 (AUC, 0.746; 95% CI, 0.607–0.885). Using the optimal LPR cutoff value of 0.47, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy were 84.1, 66.7, 88.3, 58.3, and 79.8%, respectively. Multivariate analysis by logistic regression showed that LPR was an independent predictor for LN metastasis (odds ratio, 6.45; 95% CI, 1.785–23.301; P = 0.004). In the subgroup analysis of adenocarcinoma patients (n = 18; 32 LNs), TLG3.5 was a better predictor (AUC, 0.816; 95% CI, 0.639–0.985) than LPR (AUC, 0.792; 95% CI, 0.599–0.986) or LN SUVmax (AUC, 0.792; 95% CI, 0.625–0.959). Conclusions: Our findings suggest that LPR on FDG-PET is a useful predictor for LN metastasis in patients with cN2 NSCLC. TLG can be a good predictor for LN metastasis in patients with adenocarcinoma.

    DOI: 10.1186/s12885-021-08688-6

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  23. Differential impacts of postoperative complications on patients' survival in completely resected non-small-cell lung cancer

    Kadomatsu, Y; Tsubouchi, H; Nakanishi, K; Sugiyama, T; Ueno, H; Goto, M; Ozeki, N; Nakamura, S; Fukui, T; Chen-Yoshikawa, TF

    GENERAL THORACIC AND CARDIOVASCULAR SURGERY   69 巻 ( 9 ) 頁: 1283 - 1290   2021年9月

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    記述言語:英語   出版者・発行元:General Thoracic and Cardiovascular Surgery  

    Objective: The aim of this study was to investigate the effects of inflammatory respiratory complications on long-term survival in patients with resected non-small cell lung cancer. We defined inflammatory respiratory complications to include the following six conditions: pneumonia, empyema, bronchial fistula, respiratory dysfunction, acute interstitial pneumonia, and atelectasis. Methods: Part of the National Clinical Database was linked to our prospective database from 2014 to 2017. Linkage was achieved for 866 patients. The Kaplan–Meier method was used to evaluate the overall, relapse-free, and cancer-related survival. The Cox proportional hazard model was used to analyze the impact of each complication. Results: Of the 736 patients included in the study, 149 had complications. The 5-year overall and cancer-specific survival rates were significantly lower in patients with inflammatory respiratory complications. The Cox proportional hazard model showed that the inflammatory respiratory complications had a significant impact on overall survival (hazard ratio 2.48, 95% confidence interval 1.41–4.38) but not air leak (hazard ratio 1.38, 95% confidence interval 0.70–2.70). Conclusions: Our study shows the differential impact of each complication on the survival of patients with non-small cell lung cancer. The presence of inflammatory respiratory complications was the only predictor of poor overall survival.

    DOI: 10.1007/s11748-021-01619-z

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  24. Robotic open-thoracotomy-view approach using vertical port placement and confronting monitor setting Open Access

    Sakakura, N; Nakada, T; Shirai, S; Takahara, H; Nakanishi, K; Matsui, T; Ueno, H; Takahashi, Y; Kuroda, H

    INTERACTIVE CARDIOVASCULAR AND THORACIC SURGERY   33 巻 ( 1 ) 頁: 60 - 67   2021年7月

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    記述言語:英語   出版者・発行元:Interactive Cardiovascular and Thoracic Surgery  

    OBJECTIVES: Robotic lung resections (RLRs) are conventionally performed using look-up views of the thorax from the caudal side. To conduct RLR with views similar to those in open thoracotomy, we adopted a vertical port placement and confronting upside-down monitor setting, which we called robotic 'open-thoracotomy-view approach'. We herein present our experience of this procedure. METHODS: We retrospectively reviewed 58 patients who underwent RLR (43 with lobectomy; 15 with segmentectomy) with 3-arm open-thoracotomy-view approach using the da Vinci Surgical System between February 2019 and October 2020. The patient cart was rolled in from the left cranial side of the patient regardless of the side to be operated on. Robotic ports were vertically placed along the axillary line, and 2 confronting monitors and 2 assistants were positioned on each side of the patient. The right-side monitor, which was set up for the left-side assistant to view, projected the upside-down image of the console surgeon's view. RESULTS: All procedures were safely performed. The median duration of surgery and console operation was 215 and 164 min, respectively. Emergency conversion into thoracotomy and severe morbidities did not occur, and the median postoperative hospitalization duration was 3 days. In all procedures, the console surgeon and 2 assistants had direct 'bird-eye' views of the cranially located intrathoracic structures and instrument tips, which are sometimes undetectable with the conventional look-up view. CONCLUSIONS: The open-thoracotomy-view approach setting is a possible option for RLR. It offers natural thoracotomy views and can circumvent some of the known limitations of the conventional procedure.

    DOI: 10.1093/icvts/ivab033

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  25. Comparison of surgical outcomes between thoracoscopic anatomical sublobar resection including and excluding subsegmentectomy

    Matsui T., Takahashi Y., Shirai S., Nakanishi K., Nakada T., Sakakura N., Haneda H., Okuda K., Nakanishi R., Kuroda H.

    General Thoracic and Cardiovascular Surgery   69 巻 ( 5 ) 頁: 850 - 858   2021年5月

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    出版者・発行元:General Thoracic and Cardiovascular Surgery  

    Objectives: Despite the ubiquitous utilization of anatomical sublobar resection for malignant lung tumors, the effectiveness and feasibility of subsegmentectomy remains unclear. This study therefore compared the perioperative outcomes between anatomical sublobar resection including (IS) and excluding (ES) subsegmentectomy. Methods: Patients who had undergone anatomical sublobar resection at our institution from January 2013 to March 2019 were retrospectively reviewed. Clinicopathologic characteristics and perioperative outcomes of the IS group (n = 58) were then analyzed the compared to those of the ES group (n = 203). Results: No statistically significant differences in age, sex, comorbidities, tumor location, preoperative pulmonary function, or tumor size on imaging were found between both groups. The IS group had significantly higher preoperative computed tomography-guided marking rates (40% vs. 18%; p < 0.01) and used significantly more staplers for intersegmental dissection than the ES group [4, interquartile range (IQR): 3–4 vs. 3, IQR: 3–4; p = 0.03]. Both groups had comparable 30-day mortality (0% vs. 0%; p > 0.99), intraoperative complications (7% vs. 10%; p = 0.61), and postoperative complications (5% vs. 8%; p = 0.58). After propensity score matching, the IS group experienced significantly lesser blood loss than the ES group (5 mL, IQR: 1–10 vs. 5 mL, IQR: 5–20; p = 0.03). Both groups experienced no local recurrence and demonstrated similar postoperative pulmonary functions after surgery. Conclusions: IS may be a feasible and acceptable therapeutic option for malignant lung tumors. Nonetheless, future investigations are required to further validate the current findings.

    DOI: 10.1007/s11748-020-01556-3

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  26. Left brachiocephalic vein aneurysm: a case report

    Ueno, H; Yazawa, M; Tsubouchi, H; Nakanishi, K; Sugiyama, T; Kadomatsu, Y; Goto, M; Ozeki, N; Nakamura, S; Fukui, T; Mutsuga, M; Yoshikawa, TFC

    SURGICAL CASE REPORTS   7 巻 ( 1 ) 頁: 66   2021年3月

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  27. Prognostic factors of stage I thymic epithelial tumors

    Fukui, T; Kadomatsu, Y; Tsubouchi, H; Nakanishi, K; Ueno, H; Sugiyama, T; Goto, M; Ozeki, N; Nakamura, S; Chen-Yoshikawa, TF

    GENERAL THORACIC AND CARDIOVASCULAR SURGERY   69 巻 ( 1 ) 頁: 59 - 66   2021年1月

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    記述言語:英語   出版者・発行元:General Thoracic and Cardiovascular Surgery  

    Objective: According to the tumor-node-metastasis classification for thymic malignancies, the proportion of patients diagnosed with stage I is expected to increase significantly. However, whether those patients have homogenous clinicopathological features and survival has not been fully evaluated. Methods: We reviewed 153 consecutive patients with stage I thymic epithelial tumors (133 thymomas, 15 thymic carcinomas, and 5 neuroendocrine tumors) who underwent complete resection at our institution between 2001 and 2016 and evaluated the prognostic significance of their clinicopathological factors. Results: The stage I patients accounted for 78% of all thymic epithelial tumors. The 5-year overall survival and recurrence-free survival rates of the 153 patients were 94% and 80%, respectively. The patients with the histology of thymic carcinoma or neuroendocrine tumor and with a tumor larger than 5.0 cm showed significantly worse recurrence-free survival in multivariate analysis (p = 0.027 and 0.038, respectively). Only the tumor size was revealed as a significant prognostic factor for recurrence-free survival when limited in the 133 cases of thymoma (p = 0.048). Conclusions: Patients with large tumors showed significantly worse recurrence-free survival than those with small tumors both in stage I thymic epithelial tumors and thymomas.

    DOI: 10.1007/s11748-020-01427-x

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  28. Life-threatening massive bleeding in the pulmonary trunk adjacent to the right ventricular outflow tract during the resection of a large mediastinal germ cell tumor: Proposed safety measures in the absence of cardiovascular surgeons: A case report

    Sakakura N., Nakai A., Suda H., Nakada T., Matsui T., Nakanishi K., Shirai S., Nakada J., Horio Y., Oya Y., Takahashi Y., Kuroda H.

    Mediastinum   5 巻   2021年

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    出版者・発行元:Mediastinum  

    This report presents an unusual case of life-threatening massive bleeding in the pulmonary trunk adjacent to the right ventricular outflow tract during resection of a large primary mediastinal nonseminomatous germ cell tumor (PMNSGCT) in the absence of cardiovascular surgeons. The patient was a 21-year-old male whose large mediastinal tumor was diagnosed as an extragonadal PMNSGCT, which was a mixture of a yolk sac tumor and an immature teratoma. Generally, chemotherapy causes extensive peripheral tumor necrosis of PMNSGCTs, thus enabling their complete resection. In this case, surgeons considered the resection as possible by dissecting the peripheral necrotic tissue, and cardiovascular surgeons were thus not consulted. Enlarged modified left hemi-clamshell thoracotomy (HCST) was applied. While dissecting around the pulmonary trunk, the assistant-held forceps accidentally touched the tensed pulmonary trunk, which caused bleeding. We immediately contacted the collaborating cardiac surgery department at another hospital for assistance. Meanwhile, massive bleeding occurred, leading to hemorrhagic shock, and thus direct cardiac massage was required. Our team managed to establish a venoarterial (VA) extracorporeal membrane oxygenation (ECMO). After the arrival of cardiac surgeons, a suction circuit was added, and bleeding was stopped using sutures. Finally, complete resection of the tumor was achieved, and the patient awoke the following day without any brain dysfunction. After discussions with all the members involved in the surgery, we developed an in-hospital consensus on how to perform surgeries for large thoracic tumors safely at our cancer center without the cardiovascular surgery department. We herein present the case and consensus and discuss the relevant issues.

    DOI: 10.21037/med-20-66

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  29. 多職種チームで行う「献体を用いた臓器摘出トレーニング」in Clinical Anatomy Laboratory Nagoya (CALNA)

    中村 彰太, 六鹿 雅登, 後藤 和大, 仲西 慶太, 杉山 燈人, 門松 由佳, 上野 陽史, 後藤 真輝, 尾関 直樹, 福本 紘一, 伊藤 英樹, 小山 富生, 碓氷 章彦, 芳川 豊史

    移植   56 巻 ( Supplement ) 頁: s105 - s105   2021年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本移植学会  

    <p>【背景】脳死ドナー臓器摘出では、外科医だけでなく臨床工学技士(ME)・看護師・コーディネーター等多職種が関わる医療で、実際の手技を知っていればよりよい連携が可能かもしれない。献体されたご遺体の固定方法は進化しており、特殊な保存液で固定された状態は生体と類似しているため、手術トレーニングに用いることが可能となった。肺移植実施施設でない当院での実施施設へのとり組みの一貫として、心臓外科医・ME・医学生と合同で臓器摘出トレーニングを実行したので報告する。</p><p>【トレーニング概要】開胸・心嚢切開し臓器評価方法を全員で確認した後、心灌流液注入用と肺灌流液ドレナージ用のカテーテルを各留置し、大血管を遮断し心臓摘出、続いて肺摘出を行った。続いてバックテーブルにて肺の植え込みができる状態にまで処理を行いトレーニング終了とした。心肺摘出に際して重要となる左房の処理については、操作を止め指導医にポイントを解説してもらいつつ、心臓外科・呼吸器外科の双方の考えを伝え、解剖を確認しながら行った。また、MEと肺灌流液ドレナージ経路の方法や肺灌流のタイミングなど細やかな部分まで共有できた。</p><p>【結語】本トレーニングは多職種での手技と順序の確認に有用で、臓器摘出の際互いに心がけているポイントや考えも共有・理解できた。今後はプログラムを定型化し、実践に対応できるレベルに質を高めつつ、看護師やコーディネーターも含めて行う予定である。</p>

    DOI: 10.11386/jst.56.supplement_s105

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  30. Computed tomography and positron emission tomography-staged cN0 non-small cell lung cancer Open Access

    Kuroda, H; Nakada, T; Oya, Y; Takahashi, Y; Shirai, S; Matsui, T; Nakanishi, K; Matsusita, H; Sakakura, N

    VIDEO-ASSISTED THORACIC SURGERY   5 巻 ( june ) 頁: 1 - 7   2020年6月

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    出版者・発行元:Video-Assisted Thoracic Surgery  

    Background: Little is known about the relative superiority of existing lobectomy approaches. We retrospectively summarized the clinical outcomes of four-port (i.e., multiple-port) thoracoscopic surgery (TS) lobectomy with lymph node dissection (LND) in patients with stage cN0 non-small cell lung cancer (NSCLC). Methods: This retrospective study included 245 patients (119 men and 126 women; median age, 65 years) with stage cN0 NSCLC according to both computed tomography (CT) and positron emission tomography (PET) scans. Two patients (0.8%) who underwent thoracotomy conversion were excluded. Regarding prognostic implications, disease-free survival (DFS) and overall survival (OS) outcomes were analyzed according to the mediastinal size (MD) category using the Kaplan-Meier method. Results: Overall, 10 cases (4.1%) of mediastinal nodal upstaging (cN0pN2) and 9 (3.7%) cases of hilar or peribronchial nodal upstaging (cN0pN1) were observed. The 5-year DFS and OS rates after TS lobectomy with LND were 90.5% and 97.9%, respectively. In a subgroup analysis by MD, a significant difference in DFS was only observed between the groups with a MD ≤5 mm and 1 mm (P=0.04). No significant differences in OS were observed between the subgroups. Conclusions: The clinical outcomes after TS lobectomy via the four-port, upside-down monitor approach appears to contribute to a favorable prognosis. However, MD was not identified as an independent prognostic factor for survival in patients with stage cN0 NSCLC.

    DOI: 10.21037/vats.2020.04.01

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  31. Clinicopathological Features, Surgical Outcomes, Oncogenic Status and PD-L1 Expression of Pulmonary Pleomorphic Carcinoma Open Access

    Nakanishi, K; Sakakura, N; Matsui, T; Ueno, H; Nakada, T; Oya, Y; Shimizu, J; Hida, T; Hosoda, W; Kuroda, H

    ANTICANCER RESEARCH   39 巻 ( 10 ) 頁: 5789 - 5795   2019年10月

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    記述言語:英語   出版者・発行元:Anticancer Research  

    Background/Aim: Pulmonary pleomorphic carcinoma (PPC) is rare, and few studies have reported its features. We assessed the clinicopathological features, surgical outcomes, oncogenic status and programmed death-ligand 1 (PD-L1) expression of PPC. Patients and Methods: We retrospectively reviewed data from 22 consecutive patients who underwent resection of PPC between 2007 and 2017. Results: The predominant tissue type of the epithelial component was adenocarcinoma in 15 patients (68%) and the others in 7 patients (32%), and the 3-year disease-free survival rate tended to be better in patients with an adenocarcinoma component compared to patients with another component (40.0% vs. 17.1%, p=0.059). PD-L1 expression was observed in all eight tumors whose PD-L1 status could be examined and high PDL1 expression (≥50%) was frequent (5/8, 63%). Conclusion: A predominant adenocarcinoma epithelial component in PPC might be associated with better survival outcomes and high PD-L1 expression might be frequent in PPC.

    DOI: 10.21873/anticanres.13782

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  32. Salvage Surgery for Residual Lesion/Local Reprogression After Initial Medical Treatment in Advanced Non-Small Cell Lung Cancer

    Nakanishi, K; Kuroda, H; Matsui, T; Shirai, S; Ueno, H; Sakakura, N

    JOURNAL OF THORACIC ONCOLOGY   14 巻 ( 10 ) 頁: S637 - S637   2019年10月

  33. Is Calcification in the Regional Lymph Nodes a Benign Feature in Patients with Lung Cancer?

    Nakanishi K., Nakagawa K., Asakura K., Yoshida Y., Watanabe H., Watanabe S.i.

    World Journal of Surgery   43 巻 ( 7 ) 頁: 1850 - 1856   2019年7月

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    記述言語:英語   出版者・発行元:World Journal of Surgery  

    Background: Calcified lymph nodes (LNs) on computed tomography (CT) in patients with lung cancer are generally considered to be a benign feature. However, few studies have evaluated the pathological status of such calcified LNs. We investigated the clinicopathological findings of patients with calcified LNs on preoperative CT who underwent operation for lung cancer and assessed the frequency of metastasis to calcified LNs as well as the risk factors associated with such metastases. Methods: This was a retrospective study of 72 consecutive patients with calcified LNs detected on preoperative CT who underwent pulmonary resection for primary lung cancer between 2011 and 2013. A total of 354 LN stations including 101 LN stations with calcified LNs were evaluated. Results: The frequency of metastasis to calcified LNs was 19.4% (14 of 72 patients) on a per-person basis and 18.8% (19 of 101 stations) on a per-nodal station basis. When the size of calcification was major (>5 mm), the frequency of metastasis to such calcified LNs was significantly lower than when it was minor (≦5 mm) on a per-nodal station basis (11.1% vs 27.7%, P = 0.043). Furthermore, when the size of calcification was major and the status of LN stations with calcified LNs was single, there was no metastasis to such LN stations (0 of 26 stations). Conclusions: The frequency of metastasis to calcified LNs was about 20% on both a per-person and a per-nodal station basis. Although calcified LNs as well as non-calcified LNs should be dissected during operation, dissection of a single LN station with calcification, particularly major calcification, can be omitted.

    DOI: 10.1007/s00268-019-04937-9

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  34. Thoracoscopic lobectomy using indocyanine green fluorescence to detect the interlobar fissure in a patient with displaced B3 and absence of fissure: A case report Open Access

    Nakanishi, K; Kuroda, H; Nakada, T; Ueno, H; Sakakura, N

    THORACIC CANCER   10 巻 ( 7 ) 頁: 1654 - 1656   2019年7月

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    記述言語:英語   出版者・発行元:Thoracic Cancer  

    A 90-year-old woman was admitted to our hospital with suspected lung adenocarcinoma. Preoperative three-dimensional reconstructed computed tomography revealed displacement of the anterior segmental bronchus (B3) arising from the right middle lobe bronchus with absence of the fissure between the right upper and middle lobes. A complete thoracoscopic right upper lobectomy was successfully performed. It is crucial to identify such anomalies prior to lung resection to avoid intraoperative complications during thoracoscopic lobectomy or segmentectomy. Additionally, intravenous indocyanine green with a fluorescence system was useful to identify the proper interlobar fissure boundary intraoperatively. To the best of our knowledge, this is the first reported case of thoracoscopic lobectomy for lung cancer with displaced B3 and absence of the interlobar fissure to be performed by applying the intravenous indocyanine green method.

    DOI: 10.1111/1759-7714.13104

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  35. Favorable clinical application for segmental bronchial closure based on experiment results Open Access

    Kuroda, H; Sugita, Y; Nakanishi, K; Oya, Y; Sakakura, N; Sakao, Y

    JOURNAL OF THORACIC DISEASE   11 巻 ( 6 ) 頁: 2267 - 2273   2019年6月

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    記述言語:英語   出版者・発行元:Journal of Thoracic Disease  

    Background: We previously reported the clinical application of powered vascular staple (PVS) for closure of subsegmental or segmental bronchus (SSB). This study aimed to measure breakdown pressure in experiment and to investigate bronchopleural fistula (BPF) after thoracoscopic segmentectomy (TS). Methods: Part 1: a total of 30 cadaveric pigs were used, and bronchi were categorized into the following four groups: small [S, bronchial outer diameter (BOD) of 4–8 mm, n=8], medium (M, 9–10 mm, n=9), and large (L, >10 mm, n=13). We additionally added a single additional suture to compensate for weak sites with large BOD (group R, n=6). The pressure was slowly increased, and stump breakdown was observed. Part 2: we investigated the morbidity of BPF formation at follow-up of at least 6 months in a total of 217 patients. Results: Part 1: the mean leak pressure was the highest in M, followed by groups S, R and L’. However, the significant difference was not found between S and R. Part 2: no BPF was observed, clinically. Conclusions: Based on experimental results and clinical experience, the proper selection of PVS should contribute to the safety, feasibility, and success as SSB closure.

    DOI: 10.21037/jtd.2019.06.18

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  36. Efficacy of preserving the residual stomach in esophageal cancer patients with previous gastrectomy

    Nakanishi K., Daiko H., Kato F., Kanamori J., Igaki H., Tachimori Y., Koyanagi K.

    General Thoracic and Cardiovascular Surgery   67 巻 ( 5 ) 頁: 470 - 478   2019年5月

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    記述言語:英語   出版者・発行元:General Thoracic and Cardiovascular Surgery  

    Objective: There is no consensus concerning whether the residual stomach should be preserved after esophagectomy for thoracic esophageal cancer patients with previous distal or segmental gastrectomy. The purpose of this retrospective study was to assess the efficacy of preserving the residual stomach after esophagectomy in patients with previous gastrectomy. Methods: Between 2000 and 2015, 45 consecutive thoracic esophageal cancer patients with previous distal or segmental gastrectomy underwent esophagectomy followed by colon reconstruction. Patients were assigned to two groups according to how the residual stomach was treated (preservation group, n = 11; resection group, n = 34). We compared surgical outcomes and alterations of nutrition status, including the skeletal muscle area, between the two groups. In addition, we investigated the distribution of abdominal lymph node metastases in the resection group. Results: Operative time and blood loss tended to be lower in the preservation group compared to the resection group. However, the difference did not reach statistical significance. The rate of patients decreasing skeletal muscle area after surgery was significantly higher in the resection group (88% vs 50%, P = 0.03). There were no patients with metastatic abdominal lymph nodes when the previous gastrectomy had been performed for gastric cancer and the esophageal cancer was located at the upper or middle esophagus in the resection group. Conclusions: Preservation of the residual stomach after esophagectomy in esophageal cancer patients with previous gastrectomy may influence the postoperative nutrition status and can be selectively approved.

    DOI: 10.1007/s11748-019-01070-1

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  37. Lymph node dissection in the left upper lobe: clinical outcomes and surgical techniques in Japan Open Access

    Kuroda H., Sugita Y., Nakanishi K., Sakao Y.

    Mediastinum   3 巻 ( 3 ) 頁: 16   2019年5月

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    記述言語:英語   出版者・発行元:Mediastinum  

    DOI: 10.21037/med.2019.04.04

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  38. Salvage surgery for small cell lung cancer after chemoradiotherapy

    Nakanishi, K; Mizuno, T; Sakakura, N; Kuroda, H; Shimizu, J; Hida, T; Yatabe, Y; Sakao, Y

    JAPANESE JOURNAL OF CLINICAL ONCOLOGY   49 巻 ( 4 ) 頁: 389 - 392   2019年4月

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    記述言語:英語   出版者・発行元:Japanese Journal of Clinical Oncology  

    There are few reports on the use of salvage surgery for small cell lung cancer (SCLC). Five patients who underwent resection of post-chemoradiotherapy residual lesion/local reprogression of SCLC between 2005 and 2017 were included in the study. We retrospectively reviewed their surgical outcomes and prognosis to assess the feasibility and potential efficacy of salvage surgery. Indications for salvage surgery were local reprogression (four patients) and residual lesion (one patient) with ycN0 disease. Complete pathological resection was achieved in four patients; however, malignant pleural effusion was diagnosed in one patient after the surgery. Morbidity and mortality rates were 0%. Estimated 5-year survival rate was 67%. Recurrence and death after surgery occurred only in the patient with malignant pleural effusion. We demonstrate the feasibility of salvage surgery in SCLC. In carefully-selected patients, especially those without lymph node involvement, salvage surgery may provide effective local control and favorable survival outcomes.

    DOI: 10.1093/jjco/hyz010

    Web of Science

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  39. Successful postoperative recovery management after thoracoscopic lobectomy and segmentectomy using an ERAS-based protocol of immediate ice cream intake and early ambulation: a 3-year study Open Access

    Kuroda, H; Sugita, Y; Watanabe, K; Nakanishi, K; Sakakura, N; Naito, Y; Sakao, Y

    CANCER MANAGEMENT AND RESEARCH   11 巻   頁: 4201 - 4207   2019年

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    記述言語:英語   出版者・発行元:Cancer Management and Research  

    Background: Enhanced recovery after surgery (ERAS) protocols are well known for reducing post-operative complications, facilitating early recovery and reducing hospitalization. In this study, we developed ERAS protocols involving immediate ice cream intake for checking postoperative chylothorax and subsequent early ambulation in order to investigate whether these methods have postoperative benefits. Methods: We retrospectively evaluated 500 patients who underwent thoracoscopic segmentectomy and/or lobectomy (TSL) between January 2014 and September 2017. The patients were divided into two groups: 271 patients for Phase I and 229 for Phase II. Ice cream intake commenced during Phase I. Phase I patients were made to walk on the following day, whereas Phase II ambulate within 4 hrs after immediate ice-cream intake. Results: The mean ice cream intake was significantly higher in Phase II than in Phase I (81.6% vs 56.1%). In Phase II, 91.2% and 94.0% were able to ambulate within 4 and 6 hrs, respectively. Minor postoperative complications (Clavien-Dindo I-II classification) were lower in Phase II (3.1%) than in Phase I (10.4%); however, we found no statistical significance (p=0.08). Multivariate analysis showed that ice cream intake and removal of chest drainage tube within 4-6 hrs significantly contributed to the reduction of hospitalization to ≥3 postoperative days (p=0.03 and p<0.01). Conclusions: The results of this study suggested that our ERAS protocol represented by immediate ice cream intake, and early ambulation is feasible and can help in reducing postoperative complications, chest drainage duration, and hospitalization after TSL.

    DOI: 10.2147/CMAR.S195219

    Open Access

    Web of Science

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  40. Lateral thermal spread and recurrent laryngeal nerve paralysis after minimally invasive esophagectomy in bipolar vessel sealing and ultrasonic energy devices: a comparative study

    Koyanagi K., Kato F., Nakanishi K., Ozawa S.

    Esophagus   15 巻 ( 4 ) 頁: 249 - 255   2018年10月

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    記述言語:英語   出版者・発行元:Esophagus  

    Background: This study aimed to compare the extent of lateral thermal spread of surrounding tissues after the use of advanced bipolar and ultrasonic coagulation and shearing devices. Association between recurrent laryngeal nerve paralysis (RLNP) and such devices was assessed in patients who underwent minimally invasive esophagectomy (MIE). Methods: LigaSure™ (LS) and Sonicision™ (SONIC) were used. In ex vivo experiments using the porcine muscle, blade temperature and tissue temperature were measured using a thermometer after the activation of both devices. For the clinical assessment, 46 consecutive patients who received MIE were retrospectively assessed. Results: The temperature generated at the blade of both devices increased with the activation time. The blade temperature of LS was significantly lower than that of SONIC (P < 0.001). The blade temperature of SONIC exceeded 100 °C after 3-s activation. The temperature of surrounding tissues after a single activation of the devices decreased with the tissue distance from activation blade. The temperatures of tissues at 1 and 2 mm away from the blade side of LS were significantly lower than those of SONIC (P = 0.001 and P < 0.001, respectively). The temperature of tissue 2 mm away from the blade side of LS increased 6.4 °C from the baseline temperature. Furthermore, the incidence of RLNP in the LS group was lower than that in the SONIC group (P = 0.044). Conclusion: This study highlights the necessity of spatial and temporal recognition of the thermal spread of coagulation and shearing devices to reduce the thermal injuries following MIE.

    DOI: 10.1007/s10388-018-0621-0

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  41. Indocyanine Green Intersegmental Visualization During Fluorescence Imaging of Thoracoscopic Anatomic Segmentectomy: A Novel Approach

    Matsui, T; Kuroda, H; Sugita, Y; Koyama, S; Nakanishi, K; Arimura, T; Mizuno, T; Sakakura, N; Sakao, Y

    JOURNAL OF THORACIC ONCOLOGY   13 巻 ( 10 ) 頁: S644 - S644   2018年10月

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科研費 2

  1. 線維芽細胞の多様性理解に基づく肺線維症合併肺癌の病態の解明と治療戦略の探索

    研究課題/研究課題番号:22K08997  2024年1月 - 2028年3月

    科学研究費助成事業  基盤研究(C)

    仲西 慶太, 芳川 豊史, 榎本 篤

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    担当区分:研究代表者 

    配分額:4030000円 ( 直接経費:3100000円 、 間接経費:930000円 )

    肺の不可逆的な線維化を伴う肺線維症を背景に発症する肺癌は極めて予後不良であり、その病態の解明および新規治療薬の開発は急務である。これまでに癌間質で増生する線維芽細胞には癌抑制性の細胞と癌促進性の細胞の2種類があり、両者を区別するマーカーとしてMeflinを同定した(前者で陽性、後者で陰性)。また肺線維症ではMeflin陽性線維芽細胞は線維化の抑制に、同陰性線維芽細胞は線維化の促進に働いていることを示した。本研究では肺線維症合併肺癌患者における腫瘍微小環境、特に転移巣における線維芽細胞の多様性の解明とともに、癌間質をターゲットとした新規治療戦略の開発を目的とする。
    2023年度は野生型マウスおよびMeflin KOマウスにLewis肺癌細胞株を尾静脈投与し肺転移を誘導する実験系を用いて、Meflin KOマウスにおける肺転移の頻度を野生型と比較し、線維芽細胞の多様性が転移性ニッチを形成している可能性について検証した。結果、両群において肺転移巣の個数に差は認められず、またIVISを用いた 評価でも同様の結果であった。本モデルでは尾静脈投与し直接肺転移を誘導することで、前回Meflin KOマウスと野生型マウスで差が出てしまった原発巣の影響を無くすため、今回のモデルではLewis肺癌細胞株を尾静脈投与し肺転移を誘導したが、結果は本モデルにおいても両群に有意差は認めなかった。
    また2022年度に集積したヒトIPF合併肺癌手術症例121例のブロックから薄切標本を作製し、HE染色およびMeflinの免疫組織化学染色を行った。現在、免疫組織化学染色によるMeflinの発現を評価している最中である。今後は、免疫組織化学染色で線維芽細胞におけるMeflinの発現を評価し、臨床病理学的特徴および長期予後との相関を解析する予定である。
    なお研究代表者が2023年7月よりウィーン医科大学に肺移植医療を学ぶため1年間海外留学するため、一旦本研究は中断の方針とした。再度帰国後に本研究は、Meflin KOマウスにブレオマイシンを用いて肺線維症を誘導した肺に肺転移を誘導するマウスモデルを使い、線維芽細胞の多様性が転移性ニッチを形成している可能性について更に検討していく予定である。

  2. 肺原発浸潤性粘液腺癌の免疫学的微小環境の解析とネオアンチゲン探索

    研究課題/研究課題番号:20K17772  2020年4月 - 2022年3月

    科学研究費助成事業  若手研究

    仲西 慶太

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    担当区分:研究代表者 

    配分額:3510000円 ( 直接経費:2700000円 、 間接経費:810000円 )

    浸潤性粘液腺癌は肺腺癌の中では比較的稀な組織亜型であり、遠隔転移は少ないが経気道的な肺転移が高頻度で起こるため肉眼的完全切除後も再発率が高く、放射線や殺細胞性抗癌剤による化学療法はほぼ無効であるという際立った特徴がある。再発や転移を有する症例では治療選択肢が殆どないにもかかわらず、その研究は進んでいない。本研究では新たな治療戦略として相応しい免疫チェックポイント阻害剤とがんワクチン療法の併用を視野に入れて、免疫学的微小環境の予後への影響を検討し、前向きに集積した症例において新規がんワクチン療法開発のためのネオアンチゲンを探索することを目的とする。
    112例を対象に解析を行い、うちinvasive mucinous adenocarcinomaが7例であった。Invasive mucinous群はnon-mucinous群と比較して、有意にsingle nucleotide variantが少なく、PD-L1 TPSスコアが低かった。腫瘍組織の浸潤CD8陽性リンパ球および、CD8陽性/CD39陽性/CD103陽性リンパ球が有意に少ない。さらにFoxP3、ICOS、LAG3、TIGIT、CTLA4などの分子発現が優位で免疫抑制環境が優位となっていることがわかった。
    Invasive mucinous adenocarcinomaはより免疫抑制的環境にあり、抗腫瘍免疫が働きにくい分子発現プロファイルが認められたことから、これを解除して抗腫瘍T-cellがより働く環境を作り出すことが治療につながる可能性が示唆された。Invasive mucinous adenocarcinomaに特異的なNeoantigenについては現在解析中であるものの、Invasive mucinous adenocarcinomaに対する免疫治療戦略を構築するうえで重要な基礎データが得られたと考えられる。今後、論文発表を通じて社会的な還元を目指していくつもりである。