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Faculty of Medicine College Hospital The first surgery |
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Associate Professor |
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Related SDGs |
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IMAMURA Naoya
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Papers 【 display / non-display 】
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Imamura N., Nanashima A., Tsuchimochi Y., Hamada T., Kawakami H., Hiyoshi M.
Gland Surgery 14 ( 4 ) 714 - 725 2025.4
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Gland Surgery
Background: Neoadjuvant chemotherapy (NAC) has been increasingly used in recent years in patients with pancreatic ductal adenocarcinoma (PDAC). This has forced a change in the practice of preoperative biliary drainage (PBD) is performed in PDAC patients scheduled for pancreatoduodenectomy (PD). What has changed in the NAC era and what is the appropriate method of PBD? To address this question, this study retrospectively reviewed the surgical outcomes and details of PBD in NAC and upfront surgery (US) patients. Methods: The study included consecutive PDAC patients who underwent PD from 2013 to 2021 during the transition from US to NAC, when outcomes were comparable. Clinical factors such as patient background, preoperative examination, surgical procedure, and postoperative complications were compared between the NAC group (40 patients) and the US group (59 patients), and details of PBD such as PBD procedure and adverse events were compared between the NAC and US groups who received PBD (27 NAC patients, 33 US patients). In the comparison test between groups, Fisher’s exact test and Mann-Whitney U test were mainly used. In addition, the outcomes and patency periods of each of the 128 PBD procedures were examined for the 60 patients who underwent PBD. The log-rank test was performed using the Kaplan-Meier method to compare patency period by PBD procedure. Results: There were no differences in patient background between the NAC and US groups. Compared with the US group, the NAC group had higher preoperative albumin (ALB) levels and less blood loss, but there was no difference of postoperative complications (NAC vs. US, 35% vs. 46%, respectively, P=0.29). With respect to PBD, the NAC group had more initial metallic stent (MS) placement (NAC vs. US, 52% vs. 15%, respectively, P=0.009), and fewer PBD-related adverse events (NAC vs. US, 33% vs. 61%, respectively, P=0.04). In a comparison of outcomes by drainage method, the duration of patency was significantly longer with MS placement than plastic stent (PS) placement (median days of patency, MS vs. PS, 68 vs. 15 days, respectively, P<0.001). However, MS placement and PS placement were equally likely to require a delay in the surgical schedule due to PBD-related adverse events (MS vs. PS, 6% vs. 6%, respectively, P>0.99). Conclusions: Prolonged PBD with NAC did not adversely affect surgical outcomes. MS placement provides a long patency period and is currently useful in PBD for PDAC patients undergoing PD after NAC, which requires a prolonged preoperative period. However, MS placement also has adverse events, and further studies are needed.
DOI： 10.21037/gs-2024-507
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Surgical Outcomes and Diagnostic Concordance in Patients With Pancreatic Neuroendocrine Tumors Undergoing Pancreatectomy: A Retrospective Cohort Study. Reviewed
Nanashima A, Hiyoshi M, Imamura N, Tsuchimochi Y, Wada T, Hamada T, Suzuki Y, Araki Y
Cancer diagnosis & prognosis 6 ( 1 ) 52 - 61 2026.1
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Impact of underlying liver etiology on post-hepatectomy survival outcomes in hepatocellular carcinoma patients. Reviewed
Nanashima A, Arai J, Imamura N, Hiyoshi M, Tsuchimochi Y, Wada T
Translational cancer research 14 ( 12 ) 8556 - 8566 2025.12
Language：English Publishing type：Research paper (scientific journal)
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Nanashima A., Arai J., Imamura N., Hiyoshi M., Tsuchimochi Y., Wada T., Hamada T.
Gland Surgery 14 ( 12 ) 2440 - 2455 2025.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Gland Surgery
Background: Pancreatic anastomosis has been developed, and each anastomosis has its pros and cons. This study investigated the prevalence of postoperative complications, particularly pancreatic fistula (POPF), among five types of pancreatoenteric anastomoses to determine the optimal anastomosis for patients undergoing pancreatectomy. Methods: This study retrospectively and consecutively analyzed the data of 365 patients who underwent pancreatectomy with pancreaticoenteral anastomosis at two academic institutions from 1994 to 2024. Pancreaticogastrostomy via invagination was performed in 24 patients (group PG). For pancreaticojejunal anastomosis, we performed an end-to-end invagination procedure on eight patients (group PJI), two-layer suturing procedure on 96 patients (group PJT), Kakita procedure on 55 patients (group K), and modified Blumgart procedure on 182 patients (group B). Results: Group B had the shortest hospital stay and fastest resumption of oral intake. Groups PG and PJI exhibited higher grade B/C POPF rates and prolonged ascites. The potential benefits of group B included reduced hospitalization period and enhanced recovery owing to decreased POPF rates. Habitual alcohol consumption and high preoperative creatinine levels increased the risk of POPF, whereas external drainage issues and blood loss contributed to prolonged ascites. In particular, habitual alcohol consumption [relative risk (RR) =2.42], group K anastomosis (RR =2.79), soft pancreatic texture (RR =2.48), delayed oral intake (≥4 days; RR =2.78), and complete external drainage (RR =8.68) were independent predictors of POPF. Conclusions: Modified Blumgart procedure is an optimal pancreaticoenteral anastomosis technique for avoiding POPF. Early oral intake has emerged as a protective factor, highlighting its role in improving postoperative outcomes. Surgeons should prioritize intraoperative blood conservation, perioperative nutritional support, and appropriate anastomotic selection to enhance surgical success.
DOI： 10.21037/gs-2025-380
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Nanashima A., Arai J., Hiyoshi M., Imamura N., Hamada T., Tsuchimochi Y., Shimizu I., Ochiai T., Kawakami H., Sato Y., Takashi W.
Turkish Journal of Surgery 41 ( 1 ) 5 - 18 2025.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Turkish Journal of Surgery
Objective: To elucidate surgical strategies for patients undergoing radical resection, in cases where solitary distant lymph node metastasis is identified intraoperatively, we investigated the prognostic significance of para-aortic lymph node (PALN) metastases and other regional lymph node (RLN) metastases in pancreatic carcinomas (PC) and biliary duct cancers (BDC). Material and Methods: This study retrospectively analyzed data from 181 PC patients and 116 BDC patients who underwent radical resections at two institutions between 1994 and 2021. Results: Among PC patients, metastases were observed in RLN and PALN in 54% and 9% of cases, respectively. Similarly, RLN and PALN metastases were present among BDC patients in 39% and 9% of cases, respectively. Survival analysis revealed that patients with BDC and PALN metastases exhibited significantly reduced disease-free (DFS) and overall survival (OS) compared to those without PALN involvement. Multivariate analysis identified PALN metastasis as an independent predictor of OS in BDC patients (p<0.05), while RLN metastasis was independently associated with DFS (p<0.05). Additional clinicopathological factors associated with PALN and RLN metastases were also identified. Preoperative serum levels of Duke Pancreas II monoclonal antibody were significantly elevated in patients with PALN metastases. Histological findings of lymphatic or perineural infiltration and hepatic or pancreatic invasion were independently associated with RLN metastases. Conclusion: Based on these findings, radical resection may be considered for PC patients with isolated PALN metastases only in the absence of additional adverse prognostic factors. Prospective clinical trials are warranted to further refine the criteria for surgical intervention when solitary PALN metastases are detected intraoperatively.
MISC 【 display / non-display 】
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Rare resected eight cases of duodenal adenocarcinomas.
Nanashima Atsushi, Tanoue Yukinori, Imamura Naoya, Hiyoshi Masahide, Yano Koichi, Hamada Takeomi, Nishida Takahiro, Kai Kengo, Suzuki Yasuto, Sato Yuichiro, Nakashima Koji, Hosokawa Ayumu, Nagayasu Takeshi
International journal of surgery case reports 86 106384 2021.9
Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal)
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胆管内腔発育型腫瘍の概念と実態：表層進展型胆道系腫瘍． Invited Reviewed
濵田剛臣，矢野公一，今村直哉，旭吉雅秀，藤井義郎，七島篤志
肝胆膵 75 ( 6 ) 1151 - 1158 2017.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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十二指腸乳頭部癌−現状の問題点と今後の展望−：経十二指腸的乳頭部切除の手技と適応． Invited Reviewed
今村直哉，七島篤志，濵田剛臣，矢野公一，旭吉雅秀，藤井義郎，武野慎祐，池田拓人，河野文彰，久保田良政，坂 哲臣，河上 洋
胆と膵 38 ( 7 ) 691 - 696 2017.7
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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胆膵内視鏡自由自在〜基本手技を学び応用力をつける集中講座〜：ERCP関連手技編 乳頭処置 Bridge to Surgery 悪性肝門部領域胆管閉塞． Invited Reviewed
河上 洋，久保田良政，今村直哉，旭吉雅秀，藤井義郎，七島篤志
胆と膵 37 ( (臨増特大) ) 1279 - 1285 2016.11
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal)
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新たに定義された“肝門部領域胆管癌”の診断と治療: 術前胆道ドレナージ-経皮経肝胆道ドレナージ-. (共著)
藤井義郎，濱田朗子，西田卓弘，土持有貴，濱田剛臣，矢野公一，今村直哉，土屋和代，河野文彰，旭吉雅秀，大内田次郎，池田拓人，七島篤志
胆と膵 37 ( 1 ) 71 - 74 2016.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：医学図書出版(株)
Presentations 【 display / non-display 】
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転移性肝腫瘍に対する腹腔鏡下肝切除術の周術期成績の検討.
濵田剛臣，矢野公一，土持有貴，今村直哉，旭吉雅秀，七島篤志
第30回日本内視鏡外科学会総会 (京都) 日本内視鏡外科学会
Event date： 2017.12.7 - 2017.12.9
Language：Japanese Presentation type：Poster presentation
Venue：京都
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臨床外科学会 国内外科研修報告報告.金属アレルギーを有する患者の内視鏡外科手術について．
今村直哉，七島篤志，濵田剛臣，矢野公一，旭吉雅秀，藤井義郎
第9回膵臓内視鏡外科研究会 (京都) 膵臓内視鏡外科研究会
Event date： 2017.12.6
Language：Japanese Presentation type：Oral presentation (general)
Venue：京都
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新規約におけるBorderline resectable膵癌の治療成績の再検討.
今村直哉，七島篤志，池ノ上実，和田 敬，濵田剛臣，矢野公一，旭吉雅秀，藤井義郎
第79回日本臨床外科学会総会 (東京) 日本臨床外科学会
Event date： 2017.11.23 - 2017.11.25
Language：Japanese Presentation type：Oral presentation (general)
Venue：東京
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EUS-FNAが術前診断に有用であった嚢胞性変化を伴う膵腺房細胞癌の１切除例.
池ノ上実，清水一晃，緒方祥吾，和田 敬，濵田剛臣，矢野公一，今村直哉，旭吉雅秀，藤井義郎，田中弘之，秋山 裕，片岡寛章，七島篤志
第79回日本臨床外科学会総会 (東京) 日本臨床外科学会
Event date： 2017.11.23 - 2017.11.25
Language：Japanese Presentation type：Poster presentation
Venue：東京
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シンポジウム1 外科と病理の協調 病理医は外科医からの疑問にどう応えるか：胆管内乳頭状腫瘍（IPNB）の胆道腫瘍における位置づけ.
七島篤志，今村直哉，佐藤勇一郎，角田順久，旭吉雅秀，藤井義郎
第22回日本外科病理学会学術集会 (栃木) 日本外科病理学会
Event date： 2017.11.10 - 2017.11.11
Language：Japanese Presentation type：Symposium, workshop panel (public)
Venue：栃木