Kyushu University Academic Staff Educational and Research Activities Database
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Nao Fujimori Last modified date:2023.06.21

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Academic Degree
M.D., Ph.D.
Country of degree conferring institution (Overseas)
Field of Specialization
Pancreatobiliary endoscopy, chemotherapy for pancreatobiliary cancer
Total Priod of education and research career in the foreign country
Research Interests
  • Patient-derived Organoids of Pancreatic Ductal Adenocarcinoma for Subtype Determination and Clinical Outcome Prediction
    keyword : Pancreatic cancer, organoid
  • Recurrence after curative resection of pancreatic neuroendocrine neoplasm; A multicenter retrospective study
    keyword : pancreatic neuroendocrine neoplasms
  • Liquid biopsy in pancreatic cancer
    keyword : Pancreatic cancer, liquid biopsy
  • Natural history and clinical outcomes of pancreatic neuroendocrine neoplasms
    keyword : pancreatic neuroendocrine neoplasms
  • Efficacy of endoscopic ultrasonography-guided fine-needle aspiration for the management of pancreatic cancer
    keyword : Pancreatic cancer, EUS-FNA, Liquid biopsy
Academic Activities
1. Fujimori N, Miki M, Lee L, Matsumoto K, Takamatsu Y, Takaoka T, Teramatsu K, Suehiro Y, Murakami M, Igarashi H, Oono T, Ohtsuka T, Nakamura M, Koga Y, Oda Y, Ito T, Ogawa Y, Natural history and clinical outcomes of pancreatic neuroendocrine neoplasms based on the WHO 2017 classification; a single-center experience of 30 years., Pancreatology, 10.1016/j.pan.2020.04.003, 20, 4, 709-715, 2020.06.
2. Akihisa Ohno, Nao Fujimori, Toyoma Kaku, Yu Takamatsu, Kazuhide Matsumoto, Masatoshi Murakami, Katsuhito Teramatsu, Ayumu Takeno, Masayuki Hijioka, Ken Kawabe, Naohiko Harada, Makoto Nakamuta, Akira Aso, Takamasa Oono, Yoshihiro Ogawa, Feasibility and Efficacy of Endoscopic Ultrasound-Guided Hepaticogastrostomy Without Dilation: A Propensity Score Matching Analysis., Digestive diseases and sciences, 10.1007/s10620-022-07555-z, 67, 12, 5676-5684, 2022.06, BACKGROUND: Recently, endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) procedures have been gradually established; nonetheless, some adverse events (AEs) have been reported. Dilation procedures using a non-cautery or cautery device increase the incidence of AEs in EUS-HGS. AIMS: We evaluated EUS-HGS procedures without dilation and the factors associated with dilation. METHODS: We enrolled 79 patients who underwent EUS-HGS between July 2015 and March 2021 at two centers, 72 of whom had technical success (72/79, 91%). During the EUS-HGS procedures, we defined patients without dilation procedures as the dilation (-) group. We divided the patients into two groups: the dilation (+) (35 patients) and dilation (-) (37 patients) groups. We performed a propensity score matching analysis to adjust for confounding bias between the two groups. Multivariable logistic regression analysis was conducted to identify factors associated with dilation. RESULTS: There was no difference in clinical success rate between the dilation (+) and dilation (-) groups (91% vs. 95%, P = 0.545). The AE rate (P = 0.013) and long procedure time (P = 0.017) were significantly higher in the dilation (+) group than in the dilation (-) group before and after propensity score matching. Factors associated with dilation were plastic stent placement (odds ratio [OR], 6.96; 95% confidence interval [CI], 1.68-28.7; P = 0.007) and puncture angle of ≤ 90° (OR, 44.6; 95% CI, 5.1-390; P 
3. Yu Takamatsu, Nao Fujimori, Tsukasa Miyagahara, Yuta Suehiro, Toyoma Kaku, Ken Kawabe, Akihisa Ohno, Kazuhide Matsumoto, Masatoshi Murakami, Katsuhito Teramatsu, Ayumu Takeno, Takamasa Oono, Yoshihiro Ogawa, The Glasgow Prognostic Score and stricture site can predict prognosis after endoscopic duodenal stent placement for malignant gastric outlet obstruction., Scientific reports, 10.1038/s41598-022-13209-x, 12, 1, 9746-9746, 2022.06, Endoscopic duodenal stent (DS) placement for malignant gastric outlet obstruction (GOO) is rapidly increasing in clinical practice; however, the most suitable patient candidates for DS placement have not been determined. One hundred and thirty-five patients with GOO who underwent DS placement in three Japanese referral centers between January 2010 and October 2019 were retrospectively evaluated. Overall survival (OS) after DS placement, technical/clinical success rates, adverse events, and predictive factors affecting OS after DS placement were also analyzed. The median OS after DS placement of all patients was 81 (7-901) days. Technical and clinical success rates were 99.3% and 83.7%, respectively. The GOO Scoring System score significantly increased before and after DS placement (0.9 vs. 2.7, P 
4. Masami Miki, Nao Fujimori, Keijiro Ueda, Lingaku Lee, Masatoshi Murakami, Yu Takamatsu, Yuzo Shimokawa, Yusuke Niina, Takamasa Oono, Terumasa Hisano, Masayuki Furukawa, Yoshihiro Ogawa, Treatment Effect and Safety of Nanoliposomal Irinotecan with Fluorouracil and Folinic Acid after Gemcitabine-Based Therapy in Patients with Advanced Pancreatic Cancer: A Multicenter, Prospective Observational Study., Journal of clinical medicine, 10.3390/jcm11175084, 11, 17, 2022.08, Although the combination of nanoliposomal irinotecan plus fluorouracil/folinic acid (nal-IRI/FF) exhibited survival benefits in gemcitabine-refractory patients with advanced pancreatic cancer (APC) in the phase III NAPOLI-1 trial, there is limited data on the efficacy and safety of this regimen in real-world settings in Japan. This multicenter, prospective observational study enrolled patients with APC who received nal-IRI/FF after a gemcitabine-based regimen from July 2020 to June 2021. We collected and analyzed clinical data and conducted survival and multivariate analyses. Thirty-one (78%) of the 40 patients had metastases. Nal-IRI/FF was the second-line therapy in 36 patients (90%). The median duration was 3.2 months. The disease control rate was 57%. The median progression-free survival and overall survival (OS) were 4.5 months (95% confidence interval [CI]: 2.8-5.5) and 7.4 months (95% CI: 5.1-10.6), respectively. Common ≥grade 3 toxicities included neutropenia (28%) and fatigue (23%). Fatigue led to treatment discontinuation in 6 out of 10 patients. Multivariate analysis showed that a neutrophil-to-lymphocyte ratio > 4 was a significant risk factor for a short OS (hazard ratio (HR) = 3.08, 95% CI: 1.21-7.85, p = 0.02). In conclusion, nal-IRI/FF is an appropriate treatment option for APC following gemcitabine-containing regimens..
5. Kyoko Shimizu, Tetsuhide Ito, Atsushi Irisawa, Takao Ohtsuka, Hirotaka Ohara, Atsushi Kanno, Mitsuhiro Kida, Junichi Sakagami, Naohiro Sata, Yoshifumi Takeyama, Junko Tahara, Morihisa Hirota, Nao Fujimori, Atsushi Masamune, Satoshi Mochida, Nobuyuki Enomoto, Tooru Shimosegawa, Kazuhiko Koike, Evidence-based clinical practice guidelines for chronic pancreatitis 2021., Journal of gastroenterology, 10.1007/s00535-022-01911-6, 57, 10, 709-724, 2022.10, BACKGROUND: Chronic pancreatitis (CP) is defined according to the recently proposed mechanistic definition as a pathological fibro-inflammatory syndrome of the pancreas in individuals with genetic, environmental, and/or other risk factors who develop persistent pathological responses to parenchymal injury or stress. METHODS: The clinical practice guidelines for CP in Japan were revised in 2021 based on the 2019 Japanese clinical diagnostic criteria for CP, which incorporate the concept of a pathogenic fibro-inflammatory syndrome in the pancreas. In this third edition, clinical questions are reclassified into clinical questions, background questions, and future research questions. RESULTS: Based on analysis of newly accumulated evidence, the strength of evidence and recommendations for each clinical question is described in terms of treatment selection, lifestyle guidance, pain control, treatment of exocrine and endocrine insufficiency, and treatment of complications. A flowchart outlining indications, treatment selection, and policies for cases in which treatment is ineffective is provided. For pain control, pharmacological treatment and the indications and timing for endoscopic and surgical treatment have been updated in the revised edition. CONCLUSIONS: These updated guidelines provide clinicians with useful information to assist in the diagnosis and treatment of CP..
6. Katsuhito Teramatsu, Takamasa Oono, Koki Oyama, Nao Fujimori, Masatoshi Murakami, Sho Yasumori, Akihisa Ohno, Kazuhide Matsumoto, Ayumu Takeno, Kohei Nakata, Masafumi Nakamura, Yoshihiro Ogawa, Circulating CD8+CD122+ T cells as a prognostic indicator of pancreatic cancer., BMC cancer, 10.1186/s12885-022-10207-0, 22, 1, 1134-1134, 2022.11, PURPOSE: The distribution of tissue infiltrating lymphocytes has been shown to affect the prognosis of patients with pancreatic cancer in some previous studies. However, the role of peripheral lymphocytes in pancreatic cancer remains debated. The purpose of this study was to analyze the peripheral subtypes of T lymphocytes, and establish their association with the prognosis of patients with pancreatic cancer. METHODS: Blood and tissue samples were collected from patients with metastatic pancreatic cancer (n = 54), resectable pancreatic cancer (n = 12), and benign pancreatic cysts (n = 52) between April 2019 and January 2022 and analyzed. RESULTS: Patients with metastatic pancreatic cancer had a larger proportion of both tumor-suppressive and tumor-promoting cells than those with benign pancreatic cysts. In addition, the proportion of peripheral CD4+ T cells positively correlated with the survival of patients with metastatic pancreatic cancer, and the proportion of peripheral CD8+CD122+ T cells was associated with early mortality (
7. Tsukasa Miyagahara, Nao Fujimori, Keijiro Ueda, Yu Takamatsu, Kazuhide Matsumoto, Katsuhito Teramatsu, Takehiro Takaoka, Yuta Suehiro, Yuzo Shimokawa, Kaoru Omori, Yusuke Niina, Yuichi Tachibana, Tetsuro Akashi, Takamasa Oono, Yoshihiro Ogawa, Incidence and appropriate management of drug-induced interstitial lung disease in Japanese patients with unresectable pancreatic cancer: A multicenter retrospective study., Asia-Pacific journal of clinical oncology, 10.1111/ajco.13903, 2022.12, AIM: Drug-induced interstitial lung disease (DI-ILD) is a serious adverse event during chemotherapy. This study aimed to obtain real-world data of the incidence, clinical characteristics, predictive factors, and prognosis of patients with pancreatic cancer who developed DI-ILD. METHODS: In patients with locally advanced or metastatic pancreatic cancer who underwent standard chemotherapy at our hospital and its participating facilities between April 2014 and March 2019, the clinical features, occurrence rate and clinical course of DI-ILD, and prognosis were retrospectively evaluated. RESULTS: Altogether, 390 patients were finally enrolled. DI-ILD occurred in 24 cases (6.2%). The median period from diagnosis of pancreatic cancer to the onset of DI-ILD was 2.2 months (.6-13.3 months). The rate of DI-ILD onset according to each regimen was 5.8% of gemcitabine (GEM) plus albumin-bound paclitaxel therapy (18/308), 3.8% of GEM (4/106), and 2.3% of FOLFIRINOX (2/88). The incidence of DI-ILD in GEM-based regimens was significantly higher than that in non-GEM-based regimens (p
8. Masatoshi Murakami, Nao Fujimori, Kohei Nakata, Masafumi Nakamura, Shinichi Hashimoto, Hiroshi Kurahara, Kazuyoshi Nishihara, Toshiya Abe, Shunpei Hashigo, Naotaka Kugiyama, Eisuke Ozawa, Kazuhisa Okamoto, Yusuke Ishida, Keiichi Okano, Ryo Takaki, Yutaka Shimamatsu, Tetsuhide Ito, Masami Miki, Noriko Oza, Daisuke Yamaguchi, Hirofumi Yamamoto, Hironobu Takedomi, Ken Kawabe, Tetsuro Akashi, Koichi Miyahara, Jiro Ohuchida, Yasuhiro Ogura, Yohei Nakashima, Toshiharu Ueki, Kousei Ishigami, Hironobu Umakoshi, Keijiro Ueda, Takamasa Oono, Yoshihiro Ogawa, Machine learning-based model for prediction and feature analysis of recurrence in pancreatic neuroendocrine tumors G1/G2., Journal of gastroenterology, 10.1007/s00535-023-01987-8, 58, 6, 586-597, 2023.06, BACKGROUND: Pancreatic neuroendocrine neoplasms (PanNENs) are a heterogeneous group of tumors. Although the prognosis of resected PanNENs is generally considered to be good, a relatively high recurrence rate has been reported. Given the scarcity of large-scale reports about PanNEN recurrence due to their rarity, we aimed to identify the predictors for recurrence in patients with resected PanNENs to improve prognosis. METHODS: We established a multicenter database of 573 patients with PanNENs, who underwent resection between January 1987 and July 2020 at 22 Japanese centers, mainly in the Kyushu region. We evaluated the clinical characteristics of 371 patients with localized non-functioning pancreatic neuroendocrine tumors (G1/G2). We also constructed a machine learning-based prediction model to analyze the important features to determine recurrence. RESULTS: Fifty-two patients experienced recurrence (14.0%) during the follow-up period, with the median time of recurrence being 33.7 months. The random survival forest (RSF) model showed better predictive performance than the Cox proportional hazards regression model in terms of the Harrell's C-index (0.841 vs. 0.820). The Ki-67 index, residual tumor, WHO grade, tumor size, and lymph node metastasis were the top five predictors in the RSF model; tumor size above 20 mm was the watershed with increased recurrence probability, whereas the 5-year disease-free survival rate decreased linearly as the Ki-67 index increased. CONCLUSIONS: Our study revealed the characteristics of resected PanNENs in real-world clinical practice. Machine learning techniques can be powerful analytical tools that provide new insights into the relationship between the Ki-67 index or tumor size and recurrence..