Publications by authors named "Masaru Hayami"

Background: The standard adjuvant chemotherapy regimen for stage III gastric cancer is docetaxel plus S-1 (DS) based on the results of the START-II trials. However, in clinical practice some patients could not continue this intensive doublet chemotherapy because of limited tolerability. This study aimed to assess the practical feasibility of DS and elucidate the predictive factors for the completion of adjuvant DS therapy.

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Purpose: We performed a combined assessment of skeletal muscle mass using the skeletal muscle mass index (SMI) and the psoas muscle index (PMI) to evaluate their association with the overall survival (OS) of gastric cancer patients after curative gastrectomy.

Methods: We analyzed, retrospectively, the computed tomography records of skeletal muscle mass of patients who underwent radical gastrectomy for pStage I-III gastric cancer between April, 2010 and April, 2016. We then compared OS as the primary outcome, stratifying patients according to their SMI or PMI, and investigated prognostic factors using multivariate analyses.

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Article Synopsis
  • Laparoscopic gastrectomy (LG) is a less invasive surgical option for older patients with locally advanced gastric cancer, aiming to improve postoperative outcomes.
  • A study compared the effects of LG and open gastrectomy (OG) on skeletal muscle maintenance and body weight in patients aged 75 and older, finding that LG patients had better preservation of these metrics post-surgery.
  • The results suggest that LG is particularly beneficial for certain subgroups of older patients, maintaining muscle mass and weight more effectively than OG.
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  • * The research included 4,663 patients who had radical gastrectomy for stages I-III gastric cancer, categorizing their preoperative prealbumin and C-reactive protein (CRP) levels to establish PPS scores, with lower scores indicating poorer survival.
  • * Results showed that a higher PPS correlated with worse overall survival, with scores of one and two being independent indicators of poor prognosis, suggesting that PPS can better identify at-risk patients compared to mGPS after surgery
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Background: Patients aged >80-years-old with gastric cancer are commonly excluded from clinical trials, and no consensus exists regarding surgical indications and outcomes in older patients. In this study, we analyzed the post-gastrectomy long-term survival and etiologies of mortality in older patients with gastric cancer.

Methods: Patients aged >80-years-old with pathological stages I-III primary gastric cancer who undergone radical gastrectomies, between May 2006 and March 2017, were included in the study.

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Background: It is essential to ensure optimal adherence to adjuvant chemotherapy regimens following gastric cancer surgery. However, treatment intensity for S-1 as adjuvant chemotherapy has not as yet been compared between minimally invasive (MI) and open (Open) surgery.

Methods: We retrospectively compared dose modification of adjuvant S-1 between MI and Open surgery in patients undergoing R0 gastrectomy for gastric or esophago-gastric junction cancer at the Cancer Institute Hospital Tokyo, Japan, during the period from 2012 to 2022, and receiving S-1 for pStage II or S-1 plus docetaxel for pStage III as adjuvant chemotherapy.

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Background: Proximal gastrectomy (PG) is recommended for upper-third gastric cancer and esophagogastric junction (EGJ) cancer, preserving organ function while reducing postoperative symptoms. The double-flap technique (DFT) is one approach to minimize reflux after PG. However, laparoscopic PG with DFT (LPG-DFT) has drawbacks of increased complexity, such as hand sutures for anastomosis.

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Article Synopsis
  • Laparoscopic gastrectomy (LG) is a key treatment for gastric cancer but has a steep learning curve; recent changes in training methods have prompted an analysis of factors influencing this learning process over the past decade.
  • The study analyzed 2,335 cases from trainees and experienced surgeons, finding that trainees had longer operation times but lower postoperative complications; the learning curve was around 30 cases.
  • Trainees with prior laparoscopic experience (51-100 cases) had shorter learning curves compared to those with less experience (11-50 cases), suggesting that pre-training experience can enhance the efficiency of LG training.
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  • Accurate localization of tumors is crucial for successful gastric cancer surgery, and the study evaluated the effectiveness of near-infrared fluorescent clips for this purpose.
  • In a clinical trial with 20 patients undergoing laparoscopic gastrectomy, fluorescent clips were placed near tumors and detected during surgery using specialized equipment.
  • Results showed a 75% detection rate for the clips with no related complications, demonstrating the method's safety and feasibility in surgical practice.
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Background: Intracorporeal mechanical gastrogastrostomy (IMG) techniques have recently been developed and their short-term safety was presented in their initial evaluation. However, whether they are comparable to extracorporeal hand-sewing gastrogastrostomy (EHG) remains unclear. The aim of the study is to establish the safety of IMG in totally laparoscopic pylorus-preserving gastrectomy (TLPPG) compared to EHG in laparoscopy-assisted pylorus-preserving gastrectomy (LAPPG).

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Purpose: Prevention of pancreas-related complications after gastric cancer surgery is critical. Polyglycolic acid (PGA) mesh reduces postoperative pancreatic fistula formation following pancreatic resection. However, the clinical efficacy of PGA mesh in gastric cancer surgery has not been adequately investigated.

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Aim: A positive resection margin (RM) is associated with poor survival after gastrectomy for gastric cancer (GC). However, the adequate RM length to avoid a positive RM remains controversial. We performed a systematic review to examine the RM length required to avoid a positive RM in gastrectomy for GC.

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Background: The relationship between preoperative prealbumin levels and long-term prognoses in patients with gastric cancer after gastrectomy has not been fully investigated. This study clarified the effect of preoperative prealbumin levels on the long-term prognosis of patients with gastric cancer after gastrectomy.

Methods: This retrospective cohort study included consecutive patients who underwent radical gastrectomy for primary pStage I-III gastric cancer and whose preoperative prealbumin levels were measured between May 2006 and March 2017.

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  • Sarcopenia, the loss of muscle mass, is a common issue in older patients after gastrectomy due to poor dietary intake, yet its effects on long-term outcomes have not been thoroughly researched.
  • A systematic review examined seven studies involving 1,831 patients aged 65 and older, revealing that preoperative sarcopenia is linked to poorer overall survival rates and higher complication risks post-surgery.
  • The findings highlight the need for preoperative assessments of muscle mass and potential preventative measures to improve patient outcomes.
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Background: Bronchogenic cysts are congenital lesions requiring radical resection because of malignant potential. However, a method for the optimal resection of these cysts has not been completely elucidated.

Case Summary: Herein, we presented three patients with bronchogenic cysts that were located adjacent to the gastric wall and resected laparoscopically.

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Background: As there is no consensus on the impact of antithrombotic drugs on post-gastrectomy outcomes in gastric cancer patients, this study aimed to investigate the impact of antithrombotic drugs on postoperative outcomes in these patients after gastrectomy.

Methods: Patients with Stage I-III primary gastric cancer who underwent radical gastrectomy between April 2005 and May 2022 were included. We performed propensity score matching to adjust for patient background and compared bleeding complications.

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Background: Gastric cancer often exhibits discrepancies between the gross and pathological tumor boundaries, and the degree of discrepancy may be a tumor characteristic. However, whether these discrepancies influence oncological outcomes remains unclear.

Methods: The data of patients who underwent total gastrectomy for gastric cancer from 2005 to 2018 were collected.

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Purpose: The incidence of early gastric cancer is increasing in older patients alongside life expectancy. For early gastric cancer of the upper third of the stomach, laparoscopic function-preserving gastrectomy (LFPG), including laparoscopic proximal gastrectomy (LPG) and laparoscopic subtotal gastrectomy (LSTG), is expected to be an alternative to laparoscopic total gastrectomy (LTG). However, whether LFPG has advantages over LTG in older patients remains unknown.

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Purpose: In laparoscopic surgery for upper gastric and esophagogastric junction (EGJ) cancer, it is important to achieve optimal exposure of the esophageal hiatus to secure an appropriate workspace. In recent years, hepatic left lateral segment (HLLS) inversion has been used to achieve an optimal surgical field. We present a simple technique to perform a modified HLLS inversion.

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Background: Laparoscopic gastrectomy is more frequently associated with postoperative pancreatic fistula than is open gastrectomy. We assumed that compression of the pancreas with various devices to obtain a proper operative view is associated with the higher incidence of PF in LG and that the extent of the compression differs depending on the anatomical position of the pancreas. The present study aimed to elucidate the correlation between the anatomical position of the pancreas and PF after LG for gastric cancer.

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Article Synopsis
  • The study investigates the optimal length of esophageal resection needed to achieve a pathologically negative proximal margin (PM) in patients with gastric cancer that has invaded the esophagus or the esophagogastric junction.
  • Researchers analyzed data from 289 patients and identified a maximum discrepancy (ΔPM) of 25 mm between the gross and pathological boundaries of cancer, with various factors influencing this measurement.
  • The findings suggest specific esophageal resection lengths—15 mm for smaller tumors and superficial types, and 20 mm for expansive growth types—are recommended to enhance surgical outcomes.
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Unlabelled: In older patients with cT1N0M0 gastric cancer in the middle third of the stomach, LPPG has advantages over LDGB1 in maintaining skeletal muscle mass.

Background: Laparoscopic pylorus-preserving gastrectomy (LPPG) for early gastric cancer in the middle third of the stomach is expected to be an alternative procedure to laparoscopic distal gastrectomy (LDG). However, whether LPPG is safe and more useful than LDG in older patients is unclear because of their comorbidities and organ dysfunctions.

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  • * A study retrospectively analyzed 259 patients who underwent LECS for gastric GIST between 2006 and 2020, achieving a high completion rate of 99.1% with few complications (2.8%), most commonly delayed gastric emptying.
  • * The three-year survival rates for patients who completed LECS were impressive, with 99% overall survival and 100% disease-specific survival, indicating that LECS is a safe and feasible option for
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Purpose: Deciding palliative treatment for gastric bleeding from incurable gastric cancer (IGC) is worrying considering different patient situations and the lack of comprehensive assessment of palliative treatment. We evaluated the clinical outcomes and prognostic factors after palliative treatment for gastric bleeding from IGC.

Methods: We enrolled 48 consecutive patients with gastric bleeding from IGC who underwent palliative surgery (PS) or palliative radiotherapy (PRT).

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Background: Recent research indicates long-term survival benefits of minimally invasive esophagectomy (MIE) compared with open esophagectomy (OE) for patients with esophageal and gastroesophageal junction (GEJ) cancers, but there is a need for more population-based studies.

Methods: We conducted a prospective population-based nationwide cohort study including all patients in Sweden diagnosed with esophageal or junctional cancer who underwent a transthoracic esophagectomy with intrathoracic anastomosis. Data were collected from the Swedish National Register for Esophageal and Gastric Cancer in 2006-2019.

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