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119 results on '"Hata, Hiroaki"'

2. Management challenges and the role of adjuvant chemotherapy in remnant gastric cancer: an analysis of 313 patients from the KEGG multicenter observational study

Author

Okamura, Ryosuke, Aoyama, Ryuhei, Tsunoda, Shigeru, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Jikihara, Shunpei, Kasahara, Keiko, Sakamoto, Takashi, Okumura, Shintaro, Maekawa, Hisatsugu, Nishigori, Tatsuto, Hisamori, Shigeo, and Obama, Kazutaka

Published
2024
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4. The efficacy of simple oral nutritional supplements versus usual care in postoperative patients with gastric cancer: study protocol for a multicenter, open-label, parallel, randomized controlled trial

Author

Ueno, Kohei, Nishigori, Tatsuto, Tokoro, Yukinari, Nakakura, Akiyoshi, Tsunoda, Shigeru, Hisamori, Shigeo, Hashimoto, Kyoichi, Kanaya, Seiichiro, Hirai, Kenjiro, Tanaka, Eiji, Hata, Hiroaki, Manaka, Dai, Sakaguchi, Masazumi, Kondo, Masato, Kan, Takatsugu, Itami, Atsushi, Miki, Akira, Kawamura, Yuichiro, Toda, Kosuke, Okabe, Hiroshi, Yamamoto, Michihiro, Yamashita, Yoshito, Kinjo, Yosuke, Kawada, Hironori, and Obama, Kazutaka

Published
2024
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6. Predictive and prognostic value of excision repair cross-complementing group 1 in patients with advanced gastric cancer

Author

Yamada, Yasuhide, Nagashima, Kengo, Azuma, Mizutomo, Masutani, Mitsuko, Ichikawa, Hitoshi, Iwasa, Satoru, Takahashi, Naoki, Hirano, Hidekazu, Kanato, Keisuke, Machida, Nozomu, Kinoshita, Takahiro, Hata, Hiroaki, Kawakami, Hisato, Takahari, Daisuke, Boku, Narikazu, Kurokawa, Yukinori, Terashima, Masanori, Yoshikawa, Takaki, Sekine, Shigeki, and Hiraoka, Nobuyoshi

Published
2024
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8. Comparison of Minimally Invasive Surgery with Open Surgery for Remnant Gastric Cancer: A Multi-institutional Cohort Study

Author

Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, and Obama, Kazutaka

Published
2023
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12. Safety assessment of robotic gastrectomy and analysis of surgical learning process: a multicenter cohort study

Author

Shimoike, Norihiro, Nishigori, Tatsuto, Yamashita, Yoshito, Kondo, Masato, Manaka, Dai, Kadokawa, Yoshio, Itami, Atsushi, Kanaya, Seiichiro, Hosogi, Hisahiro, Satoh, Seiji, Hata, Hiroaki, Kan, Takatsugu, Kawada, Hironori, Yamamoto, Michihiro, Tanaka, Eiji, Tsunoda, Shigeru, Hisamori, Shigeo, Hida, Koya, Ueno, Kentaro, Tanaka, Shiro, and Obama, Kazutaka

Published
2022
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14. Mesenteric closure after laparoscopic total gastrectomy with Roux-en-Y reconstruction is effective for prevention of internal hernia: a multicenter retrospective study

Author

Murakami, Katsuhiro, Obama, Kazutaka, Kanaya, Seiichiro, Satoh, Seiji, Manaka, Dai, Yamamoto, Michihiro, Kadokawa, Yoshio, Itami, Atsushi, Okabe, Hiroshi, Hata, Hiroaki, Tanaka, Eiji, Yamashita, Yoshito, Kondo, Masato, Hosogi, Hisahiro, Tsunoda, Shigeru, Hisamori, Shigeo, Nishigori, Tatsuto, and Sakai, Yoshiharu

Published
2022
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15. ASO Visual Abstract: Comparison of Minimally Invasive Surgery with Open Surgery for Remnant Gastric Cancer—A Multi-institutional Cohort Study

Author

Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, and Obama, Kazutaka

Published
2023
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20. Feasibility of Narrow-Spectrum Antimicrobial Agents for Post-Operative Intra-Abdominal Infections After Gastrectomy

Author

Goto, Kentaro, Hata, Hiroaki, Degawa, Kanako, Nakanishi, Yasutaka, Obama, Kazutaka, Goto, Kentaro, Hata, Hiroaki, Degawa, Kanako, Nakanishi, Yasutaka, and Obama, Kazutaka

Abstract

Introduction: Recently, antimicrobial resistance has received considerable attention. Broad-spectrum antimicrobial agents are recommended as the initial therapy for post-operative intra-abdominal infections. However, at our institution, we have adopted a tactic of initially treating post-operative intra-abdominal complications with relatively narrow-spectrum antimicrobial agents, such as second-generation cephalosporins. In the present study, we aimed to retrospectively analyze the use of antimicrobial agents and the resulting treatment outcomes in patients with intra-abdominal complications after gastrectomy at our facility. Methods: We conducted a retrospective observational study of patients treated with antibiotic agents for intra-abdominal infectious complications after gastrectomy between 2011 and 2021. We determined the proportion of "initial treatment failures" associated with the initial administration of antibiotic agents for post-operative intra-abdominal complications. Results: Post-operative intra-abdominal infections were observed in 29 patients. Broad-spectrum antimicrobial agents were not administered. We successfully treated 19 patients. Initial treatment failure was observed in 10 patients, of whom five experienced failure due to bacterial resistance to the initial antimicrobial agent. All 10 patients who experienced initial treatment failure were discharged after drainage procedures or other treatments. There were no deaths due to post-operative complications. Cefmetazole was used as the initial antimicrobial agent in 27 of the 29 patients. Conclusions: Considering that all patients with post-gastrectomy intra-abdominal infections were successfully treated using relatively narrow-spectrum antimicrobial agents, and initial treatment failure due to antimicrobial-resistant pathogens was 17.2%, the use of narrow-range antimicrobial agents for intra-abdominal infections after gastrectomy can be deemed appropriate.

Published
2024

21. A long-term optimal consumption and investment problem with partial information.

Author

Hata, Hiroaki

Abstract

We consider a long-term time optimal consumption and investment problem where an investor wants to maximize the expected power utility of consumption. We treat a stochastic factor model that the mean returns of risky assets depend linearly on underlying economic factors formulated as the solutions of linear stochastic differential equations. We also treat the partial information case that the investor can not observe the factor process and use only past information of risky assets. Then, our problem is formulated as a stochastic control problem with partial information. Using the martingale method, we construct the optimal strategy and obtain the optimal value explicitly. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Impact of PD-L1 expression on survival in patients with unresectable/recurrent gastric cancer receiving first-line chemotherapy without immune checkpoint inhibitors.

Author

Hirano, Hidekazu, primary, Yamada, Yasuhide, additional, Nagashima, Kengo, additional, Hiraoka, Nobuyoshi, additional, Sekine, Shigeki, additional, Takahashi, Naoki, additional, Azuma, Mizutomo, additional, Iwasa, Satoru, additional, Kanato, Keisuke, additional, Machida, Nozomu, additional, Kinoshita, Takahiro, additional, Hata, Hiroaki, additional, Kawakami, Hisato, additional, Takahari, Daisuke, additional, Ojima, Toshiyasu, additional, Kadowaki, Shigenori, additional, Boku, Narikazu, additional, Kurokawa, Yukinori, additional, Terashima, Masanori, additional, and Yoshikawa, Takaki, additional

Published
2024
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32. Predictive and prognostic value of excision repair cross-complementing group 1 by multi-omics on the outcomes in patients with advanced gastric cancer

Author

Yamada, Yasuhide, primary, Nagashima, Kengo, additional, Azuma, Mizutomo, additional, Masutani, Mitsuko, additional, Ichikawa, Hitoshi, additional, Iwasa, Satoru, additional, Takahashi, Naoki, additional, Hirano, Hidekazu, additional, Kanato, Keisuke, additional, Machida, Nozomu, additional, Kinoshita, Takahiro, additional, Hata, Hiroaki, additional, Kawakami, Hisato, additional, Takahari, Daisuke, additional, Boku, Narikazu, additional, Kurokawa, Yukinori, additional, Terashima, Masanori, additional, Yoshikawa, Takaki, additional, Sekine, Shigeki, additional, and Hiraoka, Nobuyoshi, additional

Published
2023
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34. A Case of Floating Aortic Arch Thrombosis in a Patient without Thrombophilia

Author

Oda, Ryoma, primary, Kajimoto, Kan, additional, Oishi, Atsumi, additional, Hata, Hiroaki, additional, Kamikawa, Yuki, additional, Matsui, Yuki, additional, Fujita, Wataru, additional, Nakamura, Yutaka, additional, Singh, Yu Suresvar, additional, Shitara, Jun, additional, Takano, Shintaro, additional, Wada, Hideki, additional, Shiozawa, Tomoyuki, additional, Ogita, Manabu, additional, Wada, Ryo, additional, and Suwa, Satoru, additional

Published
2023
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36. Intraneural fibrosis within ilioinguinal nerve in inguinal hernia patients with preoperative pain -It’s the sign of irreversible nerve injury, isn’t it?

Author

Narita, Masato, primary, Moriyoshi, Koki, additional, Yamaoka, Ryoya, additional, Moriyama, Masaaki, additional, Degawa, Kanako, additional, Fushitani, Masashi, additional, Kojima, Hiroya, additional, Suenaga, Takahiro, additional, Hiroki, Nakanishi, additional, Nishikawa, Gen, additional, Nakanishi, Yasutaka, additional, and Hata, Hiroaki, additional

Published
2023
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37. Expected power utility maximization with delay for insurers under the 4/2 stochastic volatility model.

Author

Hata, Hiroaki and Yasuda, Kazuhiro

Subjects
ELECTRIC utilities, EXPECTED utility, STOCHASTIC models, RICCATI equation, STOCHASTIC differential equations, INSURANCE companies, MAXIMUM principles (Mathematics)
Abstract

In this paper, we are interested in the optimal investment and reinsurance strategies of an insurer with delay under the $ 4/2 $ stochastic volatility model. Indeed, the objective of the insurer is to maximize the expected power utility of the terminal wealth and the average wealth on finite time horizon. The other objective is to maximize the growth rate of expected power utility per unit time on infinite time horizon. The wealth of the insurer is described by an approximation of the classical Cramér–Lundberg process. Then, these problems can be formulated as stochastic control problems with delay. A pair of forward-backward stochastic differential equations that are derived via the stochastic maximum principle has an explicit solution obtained by solving a Riccati differential equation. So, the optimal strategy of the finite time horizon problem can be constructed explicitly. And, by investigating asymptotics of the Riccati equation, the infinite time horizon problem can be solved explicitly. Finally, we present some numerical results to illustrate our model, optimal strategies and sensitivities of some parameters. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Comparison of Minimally Invasive Surgery with Open Surgery for Remnant Gastric Cancer: A Multi-institutional Cohort Study

Author

60597300, 20883284, 50534351, 40884325, 40447983, 70217933, 50322649, Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, Obama, Kazutaka, 60597300, 20883284, 50534351, 40884325, 40447983, 70217933, 50322649, Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, and Obama, Kazutaka

Abstract

BACKGROUND: Despite growing evidence of the effectiveness of minimally invasive surgery (MIS) for primary gastric cancer, MIS for remnant gastric cancer (RGC) remains controversial due to the rarity of the disease. This study aimed to evaluate the surgical and oncological outcomes of MIS for radical resection of RGC. PATIENTS AND METHODS: Patients with RGC who underwent surgery between 2005 and 2020 at 17 institutions were included, and a propensity score matching analysis was performed to compare the short- and long-term outcomes of MIS with open surgery. RESULTS: A total of 327 patients were included in this study and 186 patients were analyzed after matching. The risk ratios for overall and severe complications were 0.76 [95% confidence interval (CI): 0.45, 1.27] and 0.65 (95% CI: 0.32, 1.29), respectively. The MIS group had significantly less blood loss [mean difference (MD), -409 mL; 95% CI: -538, -281] and a shorter hospital stay (MD, -6.5 days; 95% CI: -13.1, 0.1) than the open surgery group. The median follow-up duration of this cohort was 4.6 years, and the 3-year overall survival were 77.9% and 76.2% in the MIS and open surgery groups, respectively [hazard ratio (HR), 0.78; 95% CI: 0.45, 1.36]. The 3-year relapse-free survival were 71.9% and 62.2% in the MIS and open surgery groups, respectively (HR, 0.71; 95% CI: 0.44, 1.16). CONCLUSIONS: MIS for RGC showed favorable short- and long-term outcomes compared to open surgery. MIS is a promising option for radical surgery for RGC.

Published
2023

42. ASO Visual Abstract: Comparison of Minimally Invasive Surgery with Open Surgery for Remnant Gastric Cancer: A Multi-institutional Cohort Study

Author

60597300, 20883284, 50534351, 40884325, 40447983, 70217933, 50322649, Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, Obama, Kazutaka, 60597300, 20883284, 50534351, 40884325, 40447983, 70217933, 50322649, Aoyama, Ryuhei, Tsunoda, Shigeru, Okamura, Ryosuke, Yamashita, Yoshito, Hata, Hiroaki, Kinjo, Yosuke, Miki, Akira, Kanaya, Seiichiro, Yamamoto, Michihiro, Matsuo, Koichi, Manaka, Dai, Tanaka, Eiji, Kawada, Hironori, Kondo, Masato, Itami, Atsushi, Kan, Takatsugu, Kadokawa, Yoshio, Ito, Tetsuo, Hirai, Kenjiro, Hosogi, Hisahiro, Nishigori, Tatsuto, Hisamori, Shigeo, Hoshino, Nobuaki, Hida, Koya, Goto, Yoshihito, Nakayama, Takeo, and Obama, Kazutaka

Published
2023

43. Identification of complications requiring interventions after gastrointestinal cancer surgery from real‐world data: An external validation study.

Author

Kinoshita, Hiromitsu, Nishigori, Tatsuto, Kunisawa, Susumu, Hida, Koya, Hosogi, Hisahiro, Inamoto, Susumu, Hata, Hiroaki, Matsusue, Ryo, Imanaka, Yuichi, Obama, Kazutaka, and Matsumura, Yumi

Abstract

Background: Recently, real‐world data have been recognized to have a significant role for research and quality improvement worldwide. The decision on the existence or nonexistence of postoperative complications is complex in clinical practice. This multicenter validation study aimed to evaluate the accuracy of identification of patients who underwent gastrointestinal (GI) cancer surgery and extraction of postoperative complications from Japanese administrative claims data. Methods: We compared data extracted from both the Diagnosis Procedure Combination (DPC) and chart review of patients who underwent GI cancer surgery from April 2016 to March 2019. Using data of 658 patients at Kyoto University Hospital, we developed algorithms for the extraction of patients and postoperative complications requiring interventions, which included an invasive procedure, reoperation, mechanical ventilation, hemodialysis, intensive care unit management, and in‐hospital mortality. The accuracy of the algorithms was externally validated using the data of 1708 patients at two other hospitals. Results: In the overall validation set, 1694 of 1708 eligible patients were correctly extracted by DPC (sensitivity 0.992 and positive predictive value 0.992). All postoperative complications requiring interventions had a sensitivity of >0.798 and a specificity of almost 1.000. The overall sensitivity and specificity of Clavien–Dindo ≥grade IIIb complications was 1.000 and 0.995, respectively. Conclusion: Patients undergoing GI cancer surgery and postoperative complications requiring interventions can be accurately identified using the real‐world data. This multicenter external validation study may contribute to future research on hospital quality improvement or to a large‐scale comparison study among nationwide hospitals using real‐world data. [ABSTRACT FROM AUTHOR]

Published
2023
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44. The new prognostic index of advanced gastric cancer using the data from JCOG1013.

Author

Takahari, Daisuke, primary, Boku, Narikazu, additional, Iwasa, Satoru, additional, Mizusawa, Junki, additional, Hashimoto, Tadayoshi, additional, Yoshikawa, Takaki, additional, Kadowaki, Shigenori, additional, Machida, Nozomu, additional, Ishido, Kenji, additional, Tsuda, Masahiro, additional, Kinoshita, Takahiro, additional, Yasuda, Takushi, additional, Chin, Keisho, additional, Hata, Hiroaki, additional, Ojima, Toshiyasu, additional, Yamada, Yasuhide, additional, and Terashima, Masanori, additional

Published
2023
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45. Advantages of minimally invasive surgery for remnant gastric cancer: A multi-institutional cohort study.

Author

Aoyama, Ryuhei, primary, Tsunoda, Shigeru, additional, Okamura, Ryosuke, additional, Yamashita, Yoshito, additional, Hata, Hiroaki, additional, Kinjo, Yousuke, additional, Miki, Akira, additional, Kanaya, Seiichiro, additional, Yamamoto, Michihiro, additional, Matsuo, Koichi, additional, Manaka, Dai, additional, Itami, Atsushi, additional, Kan, Takatsugu, additional, Ito, Tetsuo, additional, Hirai, Kenjiro, additional, Hosogi, Hisahiro, additional, Nishigori, Tatsuto, additional, Hisamori, Shigeo, additional, Hoshino, Nobuaki, additional, and Obama, Kazutaka, additional

Published
2023
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46. 323. CLINICAL CHARACTERISTICS OF HIATAL HERNIA WITH ANEMIA AND SIGNIFICANCE OF SURGICAL REPAIR

Author

Nakanishi, Yasutaka, primary, Hata, Hiroaki, additional, Suenaga, Takahiro, additional, Moriyama, Masaaki, additional, Degawa, Kanako, additional, Kojima, Hiroya, additional, Kanbe, Hiroyuki, additional, Miki, Akimori, additional, Nakanishi, Hiroki, additional, Yamaoka, Ryoya, additional, Matsusue, Ryo, additional, Narita, Masato, additional, Otani, Tetsushi, additional, and Yamaguchi, Takashi, additional

Published
2022
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