Systematic review with network meta-analysis: comparative efficacy of different enteral immunonutrition formulas in patients underwent gastrectomy

Nutritional support via feeding jejunostomy in esophago-gastric cancers: proposal of a common working strategy based on the available evidence

Malnutrition is common in patients affected by esophago-gastric cancers and has a negative impact on both clinical and economic outcomes. Yet not all patients at risk of malnutrition are routinely assessed and receive appropriate support. Further, available research does not provide a mean for standardization of timing, route, and dosage for nutritional support, and this is particularly true for enteral nutrition via feeding jejunostomy. Herein, we provide an overview of the current evidence and use the gathered knowledge as a starting point for a consensus proposal. As a result, we aim to facilitate the development of appropriate and uniformed interventions, thus fulfilling the need for a multimodal therapeutic approach in these set of cancer patients.

Efficacy of a new immunonutrition formula with extra virgin olive oil in the reduction of complications in surgeries of upper digestive tract tumors

Background

To demonstrate whether a nutritional supplement enriched with arginine, nucleotides, omega-3 fatty acids, and extra virgin olive oil reduces postoperative complications in patients with tumors in the upper digestive tract.

Methods

A randomized, controlled, double-blind, multicenter clinical trial, in which a new immunomodulatory formula with extra virgin olive oil was compared with a standard isoprotein and isoenergetic formula. Patients with gastric, esophageal or biliopancreatic tumors were recruited to receive two units of immunomodulatory formula or control, 5 days before the surgical intervention.

Results

A total of 119 patients were recruited. There was a significant reduction in the number of reinterventions (7.7 vs. 20.4%; p = 0.044) in the intervention group. There was a significant reduction in the development of fistulas in patients with phase angles >5.7°. Also, there were fewer readmissions after biliopancreatic surgeries (0.0 vs. 100%; p = 0.014). The length of hospital stay was similar between groups; however, with the immunomodulatory formula, the patients exhibited greater phase angle at the end of follow-up.

Conclusion

The immunomodulatory formula with extra virgin olive oil administered 5 days before surgery for stomach, esophageal and biliopancreatic tumors improved cellular health and reduced postoperative complications.Clinical trial registration: [https://clinicaltrials.gov/], identifier [NCT04027088].

Pharmaconutrition: Which substrates?

With the term "pharmaconutrition" or "immunonutrition" is intended the use of specific nutritional substrates having the ability of modulating specific mechanisms involved in several immune and inflammatory pathways. To achieve these goals, these substrates have to be administered with over physiologic dose. Glutamine and omega-3 polyunsaturated fatty acids, used as single substrate, did not show clear clinical advantages on solid endpoints such as postoperative complications. Despite several multiple substrate enteral feeds are available on the market, very few of them have been tested in randomized clinical trial to prove efficacy. The most extensive investigated formulation is a combination of arginine, omega-3 fatty acids, ribonucleic acid with or without glutamine. Several meta-analyses of randomized clinical trials have been conducted to compare the effects of enteral immunonutrition with control diets on post-surgical morbidity. The results consistently showed that the use of enteral multiple substrate formulas significantly reduced infectious complications and duration of hospitalization. In a more contemporary view, pharmaconutrition should be tested more accurately in the contest of enhanced recovery programs, during neoadjuvant chemotherapy, and in the prehabilitation setting.

Impact of Perioperative Immunonutrition on Postoperative Outcomes for Patients Undergoing Head and Neck or Gastrointestinal Cancer Surgeries: A Systematic Review and Meta-analysis of Randomized Controlled Trials

OBJECTIVE

To clarify whether perioperative immunonutrition is effective in adult patients with or without malnutrition undergoing elective surgery for head and neck (HAN) or gastrointestinal (GI) cancers.

BACKGROUND

It is important to avoid postoperative complications in patients with cancer as they can compromise clinical outcomes. There is no consensus on the efficacy of perioperative immunonutrition in patients with or without malnutrition undergoing HAN or GI cancer surgery.

MATERIALS AND METHODS

We searched MEDLINE (PubMed), MEDLINE (OVID), EMBASE, Cochrane Central Register of Controlled Trials, Web of Science Core Selection, and Emcare from 1981 to 2022 using search terms related to immunonutrition and HAN or GI cancer. We included randomized controlled trials. Intervention was defined as immunonutritional therapy including arginine, n-3 omega fatty acids, or glutamine during the perioperative period. The control was defined as standard nutritional therapy. The primary outcomes were total postoperative and infectious complications, defined as events with a Clavien-Dindo classification grade ≥ II that occurred within 30 days after surgery.

RESULTS

Of the 4825 patients from 48 included studies, 19 had upper GI cancer, 9 had lower, and 8 had mixed cancer, whereas 12 had HAN cancers. Immunonutrition reduced the total postoperative complications (relative risk ratio: 0.78; 95% CI, 0.66-0.93; certainty of evidence: high) and infectious complications (relative risk ratio: 0.71; 95% CI, 0.61-0.82; certainty of evidence: high) compared with standard nutritional therapy.

CONCLUSIONS

Nutritional intervention with perioperative immunonutrition in patients with HAN and GI cancers significantly reduced total postoperative complications and infectious complications.

Impact of Perioperative Immunonutrition on Postoperative Outcomes in Patients with Upper Gastrointestinal Cancer: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

There is no consensus on the efficacy of perioperative immunonutrition in patients with upper gastrointestinal (GI) cancer surgery. We clarified the impact of perioperative immunonutrition on postoperative outcomes in patients with upper GI cancers. We searched MEDLINE (PubMed), MEDLINE (OVID), EMBASE, Cochrane Central Register of Controlled Trials, Web of Science Core Selection, and Emcare from 1981-2022 using search terms related to immunonutrition and upper GI cancer. We included randomized controlled trials. Intervention was defined as immunonutritional therapy, including arginine, n-3 omega fatty acids, or glutamine during the perioperative period. The control was defined as standard nutritional therapy. The primary outcomes were infectious complications, defined as events with a Clavien-Dindo classification grade ≥ II that occurred within 30 days after surgery. After screening, 23 studies were included in the qualitative synthesis and in the quantitative synthesis. The meta-analysis showed that immunonutrition reduced infectious complications (relative risk ratio: 0.72; 95% confidence interval: 0.57-0.92; certainty of evidence: Moderate) compared with standard nutritional therapy. In conclusion, nutritional intervention with perioperative immunonutrition in patients with upper GI cancers significantly reduced infectious complications. The effect of immunonutrition for upper GI cancers in reducing the risk of infectious complications was about 30%.

Immunonutrition vs standard nutrition for patients with cancer

The prevailing belief in the value of immunonnutrition has been questioned as different patient populations show variable responses ranging from no benefit or even harm to significant improvements in clinical outcomes. The subject of this invited review is a previously published meta-analysis that showed important benefits from the perioperative use of an immunonutrition formula (defined as nutrition therapy that contains specific immune-modulating agents) in a distinct population: adult patients with cancer undergoing an elective major surgical operation. Findings showed that use of an immunonutrition formula was associated with reduced infectious morbidity, anastomotic leakage, hospital length of stay, and postoperative complications compared with standard formulations. These benefits were seen after adjusting for bias and removal of older publications. Issues, such as dosing, duration of therapy, baseline nutrition status, content of specific immunomodulatory agents, and route of delivery that contributed to the beneficial response, were discussed. Little difference in response was seen between well-nourished and malnourished patients, but geographic differences were seen, with greater outcome benefits seen in studies originating from Europe than from Asia or the United States. The best results were seen when at least three agents (arginine, fish oil, and RNA nucleotides) were given, with the timing of the delivery occurring throughout the perioperative period. A review of this meta-analysis is warranted because it shows a consistent benefit from such therapy over 30 years of clinical research, provides a detailed subset analysis of related issues, and highlights its value in improving outcome in this patient population.

Effects of Immunonutrition on Cancer Patients Undergoing Surgery: A Scoping Review

Introduction: There is a large body of evidence about immunonutrition formulas; however, there are still doubts about their usefulness in routine clinical practice as compared with standard formulas. In the age of personalized medicine, new studies appear every year regarding several types of patients; therefore, an updated point of view on these formulas is necessary. Methods: The Embase database was searched from 2016 to 14 March 2022. Our criteria were articles published in English and Spanish. The evidence quality was evaluated using GRADEpro, and the review was developed according to the PRISMA statement. Results: In this review, a total of 65 unique records were retrieved; however, 36 articles did not meet the inclusion criteria and were thus excluded. In total, 29 articles were included in the final analysis. In the last few years, many meta-analyses have attempted to identify additional existing studies of surgical patients with certain pathologies, mainly oncological patients. Immunonutrition prior to oncological surgery was shown to cause a decrease in inflammatory markers in most of the studies, and the main clinical events that changed were the infectious complications after surgery. The length of stay and mortality data are controversial due to the specific risk factors associated with these events. Conclusions: The use of immunonutrition in patients who have undergone oncological surgery decreases the levels of inflammatory markers and infectious postoperative complications in almost all localizations. However, more studies are needed to assess the use of immunonutrition based on Enhanced Recovery After Surgery (ERAS) protocols.

Impact of serum albumin concentration and neutrophil-lymphocyte ratio score on gastric cancer prognosis

INTRODUCTION/AIM

Serum albumin concentration (COA) and neutrophil-lymphocyte ratio (NLR) could reflect immunological and nutritional status. We aim to evaluate the impact of COA-NLR score on the prognosis of gastric cancer (GC).

MATERIAL AND METHODS

We perform a retrospective analysis on a database of 637 GC cases, between January 2010 and December 2017. In 396 patients, the inclusion criteria for this study were met (non-resectional or palliative surgery were excluded). Analytic data was only available in 203 patients. COA-NLR score was defined as follows: COA under 35 g/L and NLR value of 2.585 or higher, score 2; one of these conditions, score 1; and neither, score 0.

RESULTS

In our population (n = 203), 87 patients were classified as score 0, 82 as score 1 and 34 as score 2. COA-NLR score was significantly associated with DFS (HR 1.674; CI 95% 1.115-2.513; p = 0.013) and with OS (HR 2.072; CI 95% 1.531-2.805; p < 0.001). Kaplan-Meier curve analysis (log rank test) revealed that a higher score of COA-NLR predicted a worse OS (p < 0.001) and DFS (p = 0.03). COA-NLR was an independent prognostic factor for OS when adjusted to pStage and age (adjusted HR 1.566; CI 95% 1.145-2.143; p = 0.005).

CONCLUSIONS

Preoperative COA-NLR score was significantly associated with worse OS and DFS and, in this way, with worse prognosis on GC patients submitted to curative-intent resectional surgery.

Network meta-analysis of the optimal time of applying enteral immunonutrition in esophageal cancer patients receiving esophagectomy

BACKGROUND

Enteral immunonutrition (EIN) has been extensively applied in cancer patients; however, its role in esophageal cancer (EC) patients receiving esophagectomy remains unclear. We performed this network meta-analysis to investigate the impact of EIN on patients undergoing surgery for EC and further determine the optimal time of applying EIN.

METHODS

We searched PubMed, EMBASE, Cochrane library, and China National Knowledgement Infrastructure (CNKI) to identify eligible studies. Categorical data was expressed as the odds ratio with 95% confidence interval (CI), and continuous data was expressed as mean difference (MD) with 95% CI. Meta-analysis with head-to-head approach and network meta-analysis was performed to evaluate the impact of EIN on clinical outcomes using RevMan 5.3 and ADDIS V.1.16.8 software. The surface under the cumulative ranking curve (SUCRA) was calculated to rank all nutritional regimes.

RESULTS

Total 14 studies involving 1071 patients were included. Meta-analysis with head-to-head approach indicated no difference between EIN regardless of the application time and standard EN (SEN); however, subgroup analyses found that postoperative EIN was associated with decreased incidence of total infectious complications (OR = 0.47; 95%CI = 0.26 to 0.84; p = 0.01) and pneumonia (OR = 0.47; 95%CI = 0.25 to 0.90; p = 0.02) and shortened the length of hospitalization (LOH) (MD =  - 1.01; 95%CI =  - 1.44 to - 0.57; p < 0.001) compared to SEN, which were all supported by network meta-analyses. Ranking probability analysis further indicated that postoperative EIN has the highest probability of being the optimal option in terms of these three outcomes.

CONCLUSIONS

Postoperative EIN should be preferentially utilized in EC patients undergoing esophagectomy because it has optimal potential of decreasing the risk of total infectious complications and pneumonia and shortening LOH.

OSF REGISTRATION NUMBER

10.17605/OSF.IO/KJ9UY.

Immunonutrition in ovarian cancer: clinical and immunological impact?

OBJECTIVE

Malnutrition is frequent in ovarian cancer (OC) patients and may compromise post-operative outcomes. The aim of this study is to evaluate the impact of pre-operative immunonutrition on the surgical outcome of OC patients, and on their nutritional, inflammatory and peripheral blood immune status.

METHODS

A prospective study was performed between September 2016 and April 2020. Immune-enhancing enteral nutrition was administered to 42 patients before surgery according to their nutritional status assessed by the Malnutritional Universal Screening Tool. Biochemical and hematological monitoring was performed before and after immunonutrition. Post-operative outcomes were assessed and compared with those of a similar group of patients treated without nutritional support.

RESULTS

Of the 42 immune-nourished patients, 23 (54.8%) had a low, 11 (26.2%) an intermediate and 8 (19%) a high risk of malnutrition. After the immunonutritional intake, significant variations of prealbumin, creatinine and white blood cells were detected. All T cell populations had an increasing trend, in particular CD3⁺ T lymphocytes (p=0.020), CD3⁺CD8⁺ cytotoxic T lymphocytes (p=0.046) and lymphocyte with HLA-DR expression (p=0.012). The rate of grade II-III post-operative complications was lower (21.4% vs. 42.9%, p=0.035) and the time of hospitalization was shorter (7.5 vs. 9.2, p=0.009) in the immune-nourished group.

CONCLUSION

Pre-operative immunonutrition improves the surgical outcome of OC patients. After immunonutrition, an increase of CD3⁺CD8⁺ cytotoxic T lymphocytes was observed.

Immunonutrition reduces complications rate and length of stay after laparoscopic total gastrectomy: a single unit retrospective study

BACKGROUND

Preoperative immunonutrition (IN) reduces the incidence of postoperative complications in malnourished patients undergoing upper gastrointestinal surgery. However, its effect in norm-nourished patients remains unclear. Furthermore, patients with gastric cancer undergoing laparoscopic total gastrectomy (LTG) are not routinely included in protocols of enhanced recovery after surgery (ERAS).

OBJECTIVE

The aim of this study was to investigate the effects of perioperative IN in patients undergoing laparoscopic total gastrectomy (LTG) within an established ERAS pathway.

METHODS

A comparative retrospective study of patients undergoing LTG, receiving an immune-enhancing feed plus maltodextrin load the day of surgery (Group A) versus patients who had the same operation but no IN nor fast track management (group B).

RESULTS

There were no significant differences in patient demographic characteristics between the two groups but the medium age of patients in group A was older. Thirty-days postoperative complications were respectively 8.7% in Group A and 33.3% in Group B (p 0.04). Mean and median LOS for Group A and B were also significantly different: 7.2 ± 4.4 vs 10.3 ± 5.4 and 7 vs 10 days respectively.

CONCLUSION

Preoperative IN associated with ERAS protocol in normo-nourished patient undergoing LTG seems to reduce postoperative complications. Reduction in LOS is possibly associated to the ERAS protocol. Clinical trial registration Clinical trials.gov: NCT05259488.

Comparative Effectiveness of Enhanced Patient Instructions for Bowel Preparation Before Colonoscopy: Network Meta-analysis of 23 Randomized Controlled Trials

Background

Various enhanced patient instructions (EPIs) have been used for bowel preparation (BP) and our previous meta-analysis also demonstrated the efficacy of EPIs in increasing the colonic polyp and adenoma detection rates; however, the optimal method for adequate BP has not yet been developed.

Objective

We performed a network meta-analysis to determine the optimal instructions.

Methods

We searched for randomized controlled trials (RCTs) comparing the effectiveness of EPIs with each other or standard patient instructions (SPIs) for BP. We performed direct and Bayesian network meta-analyses for all instructions and used the GRADE (Grading of Recommendations Assessment, Development and Evaluation) criteria to appraise the quality of evidence.

Results

We included 23 RCTs (7969 patients) comparing 10 different instructions. In direct meta-analyses, most of the EPIs, except visual aids and mobile apps, increased the adequate preparation rate (APR). Network meta-analyses showed that additional explanations were superior to visual aids (odds ratio [OR] 0.35, 95% CI 0.19-0.59), telephone calls (OR 0.62, 95% CI 0.37-0.99), educational videos (OR 0.79, 95% CI 0.5-0.77), and mobile apps (OR 0.33, 95% CI 0.14-0.68) with low-to-high-quality evidence; newly designed booklets (OR 3.28, 95% CI 1.59-6.16), SMS text messaging (OR 2.33, 95% CI 1.28-3.91), telephone calls (OR 1.86, 95% CI 1.03-1.78), educational videos (OR 2.33, 95% CI 1.40-3.65), and social media applications (OR 2.42, 95% CI 1.4-3.93) were superior to visual aids and mobile apps with low-to-high-quality evidence. SMS text messaging, telephone calls, and social media applications increase adherence to and satisfaction with the BP regime. Social media applications reduce the risk of adverse events (AEs). Telephone calls and social media applications increase the polyp detection rate (PDR).

Conclusions

Newly designed booklets, telephone calls, educational videos, and social media applications can improve the quality of BP. Telephone calls and social media applications improve adherence to and satisfaction with the BP regime, reduce the risk of AEs, and increase the PDR.

Trial Registration

INPLASY (International Platform of Registered Systematic Review and Meta-analysis Protocols) INPLASY2020120103; https://inplasy.com/inplasy-2020-12-0103/

Nutritional management of gastric cancer

Gastric cancer is the third leading cause of cancer mortality and is frequently associated with nutritional disorders, the detection and proper management of which can contribute to improving quality of life and survival. Being aware of the consequences and of the different treatments for this neoplasm allows us to offer an adequate nutritional approach. In surgical candidates, integration into ERAS-type programs is increasingly frequent, and includes a pre-surgical nutritional approach and the initiation of early oral tolerance. After gastrectomy, the new anatomical and functional state of the digestive tract may lead to the appearance of "post-gastrectomy syndromes", the management of which may require diet modification and medical treatment. Those who receive neoadjuvant or adjuvant antineoplastic therapy benefit from specific dietary recommendations based on intercurrent symptoms and/or artificial nutrition. In palliative patients, the nutritional approach should be carried out while respecting the principle of autonomy and weighing the risks and benefits of the intervention. The objective of this review is to highlight the importance and role of nutrition in patients with gastric cancer and to provide guidelines for nutritional management based on the current evidence.

Network meta-analysis of triazole, polyene, and echinocandin antifungal agents in invasive fungal infection prophylaxis in patients with hematological malignancies

BACKGROUND AND AIM

Triazole, polyene, and echinocandin antifungal agents are extensively used to treat invasive fungal infections (IFIs); however, the optimal prophylaxis option is not clear. This study aimed to determine the optimal agent against IFIs for patients with hematological malignancies.

METHODS

Randomized controlled trials (RCTs) comparing the effectiveness of triazole, polyene, and echinocandin antifungal agents with each other or placebo for IFIs in patients with hematological malignancies were searched. This Bayesian network meta-analysis was performed for all agents.

RESULTS

The network meta-analyses showed that all triazoles, amphotericin B, and caspofungin, but not micafungin, reduced IFIs. Posaconazole was superior to fluconazole [odds ratio (OR), 0.30; 95% credible interval (CrI), 0.12-0.60], itraconazole (OR, 0.40; 95% CrI, 0.15-0.85), and amphotericin B (OR, 4.97; 95% CrI, 1.73-11.35). It also reduced all-cause mortality compared with fluconazole (OR, 0.35; 95% CrI, 0.08-0.96) and itraconazole (OR, 0.33; 95% CrI, 0.07-0.94), and reduced the risk of adverse events compared with fluconazole (OR, 0.02; 95% CrI, 0.00-0.03), itraconazole (OR, 0.01; 95% CrI, 0.00-0.02), posaconazole (OR, 0.02; 95% CrI, 0.00-0.03), voriconazole (OR, 0.005; 95% CrI, 0.00 to 0.01), amphotericin B (OR, 0.004; 95% CrI, 0.00-0.01), and caspofungin (OR, 0.05; 95% CrI, 0.00-0.42) despite no significant difference in the need for empirical treatment and the proportion of successful treatment.

CONCLUSIONS

Posaconazole might be an optimal prophylaxis agent because it reduced IFIs, all-cause mortality, and adverse events, despite no difference in the need for empirical treatment and the proportion of successful treatment.

Preoperative transferrin level is a novel prognostic marker for colorectal cancer

AIM

This study investigated whether preoperative serum transferrin, a rapid-turnover protein, was associated with prognosis after colorectal cancer (CRC) resection.

METHODS

We evaluated preoperative transferrin, which was calculated as iron and unsaturated iron-binding capacity, in 501 patients who underwent surgery for Stage I-III CRC. Transferrin level was directly proportional to total iron-binding capacity (TIBC), and TIBC < 250 μg/dl was defined as low transferrin. The associations between transferrin and prognosis were evaluated in univariate and multivariate Cox proportional hazards analyses.

RESULTS

Fifty-eight of 501 patients (11.5%) had low transferrin. In these patients, low transferrin was significantly associated with high age, female gender, low body mass index (<18.5), high white blood cell count, low total protein, low albumin, high C-reactive protein, low hemoglobin, and low neutrophil/lymphocyte ratio. In the univariate analysis, low transferrin was associated with shorter relapse-free survival (RFS) (hazard ratio [HR] 2.180, 95% confidence interval [CI] 1.417-3.354, P < .001), overall survival (OS) (HR 2.930, 95% CI 1.784-4.811, P < .001), and cancer-specific survival (CSS) (HR 2.122, 95% CI 1.053-4.275, P = .035). In multivariate analysis, high age (P < .001), Glasgow Prognostic Score (P = .009), and low transferrin (HR 2.336, 95% CI 1.173-4.654, P = .011) were independently associated with shorter OS, and depth of invasion pT4 (P = .015), presence of lymph node metastasis (P = .001), low hemoglobin (P = .034), and low transferrin (HR 2.638, 95% CI 1.113-5.043, P = .025) were independently associated with shorter CSS.

CONCLUSIONS

Preoperative serum transferrin in Stage I-III CRC patients was identified as a novel prognostic marker by univariate and multivariate analyses.

Nutritional management of gastric cancer

Gastric cancer is the third leading cause of cancer mortality and is frequently associated with nutritional disorders, the detection and proper management of which can contribute to improving quality of life and survival. Being aware of the consequences and of the different treatments for this neoplasm allows us to offer an adequate nutritional approach. In surgical candidates, integration into ERAS-type programs (Enhanced Recovery after Surgery) is increasingly frequent, and includes a pre-surgical nutritional approach and the initiation of early oral tolerance. After gastrectomy, the new anatomical and functional state of the digestive tract may lead to the appearance of «post-gastrectomy syndromes», the management of which may require diet modification and medical treatment. Those who receive neoadjuvant or adjuvant antineoplastic therapy benefit from specific dietary recommendations based on intercurrent symptoms and/or artificial nutrition. In palliative patients, the nutritional approach should be carried out while respecting the principle of autonomy and weighing the risks and benefits of the intervention. The objective of this review is to highlight the importance and role of nutrition in patients with gastric cancer and to provide guidelines for nutritional management based on the current evidence.

Effects of exercise interventions for specific cognitive domains in old adults with mild cognitive impairment: A meta-analysis and subgroup analysis of randomized controlled trials

OBJECTIVE

To conduct a meta-analysis and subgroup analysis investigating the effects of exercise on mild cognitive impairment (MCI) patients across specific cognitive domain outcomes. We also analyzed and identified the level of influence of exercise interventions on specific cognitive domains.

METHODS

MEDLINE, EMBASE, Cochrane Library, Web of Science, CNKI, the Wan Fang Database, and CBM were searched from inception to April 2018. Randomized controlled trials of exercise interventions in MCI patients older than 55 years, with an outcome measure of cognitive function were included.

RESULTS

Eleven studies with sufficient data met the inclusion criteria for the meta-analysis. Exercise interventions significantly improved general function (g mini-mental state examination Montreal cognitive assessment = 0.32, 95% the 95% confidence interval (CI) 0.1 to 0.54, P = .005 and g Alzheimer disease assessment scale-cognition = -0.45, 95% CI -0.82 to -0.08, P = .02); executive functions (g digit span forward test, digit span backward test, digit span forward test -B, stroop test-A, stroop test-B = 0.66, 95% CI 0.17 to 1.15, P = .008); memory (g Wechsler memory scale immediate recall and Wechsler memory scale delayed recall = 0.37, 95% CI 0.15 to 0.60, P = .001); language ability (g category verbal fluency test and letter verbal fluency test = 0.55, 95% CI 0.22 to 0.89, P = .001); and visuospatial ability (g block design score = 0.38, 95% CI 0.03 to 0.72, P = .03). However, the improvement exercise conferred on the trail-making test part B-A was not statistically significant (g trail-making test part B-A  = -0.25, 95% CI -0.88 to 0.39, P = .45). The preliminary ranking of the effect on the overall effect was as follows: Z language ability > Z executive functions >   memory > Z visuospatial ability.

CONCLUSION

Exercise improves performance in the 5 cognitive domains. Across cognitive domains, language ability was the domain most affected by exercise. Besides, the kind of ranking (Z value) provides a new perspective for community health care workers to prescribe targeted exercise interventions for MCI patients.PROSPERO registration number: CRD42018093902.

Enhanced recovery after surgery for gastric cancer (ERAS-GC): optimizing patient outcome

Significant advances were achieved, in last decades, in the management of surgical patients with gastric cancer. This has led to the concept of enhanced recovery after surgery (ERAS) with the objective of reducing the length of hospital stay, accelerating postoperative recovery and reducing the surgical stress. The ERAS protocols have many items, including the pre-operative patient education, early mobilization and feeding starting from the first postoperative day. This review aims to highlight possible advantages on postoperative functional recovery outcomes after gastrectomy in patients undergoing an ERAS program, current lack of evidences and future perspectives.

Effects of specific nutrients on immune modulation in patients with gastrectomy

Gastric cancer (GC) is one of the most prevalent and lethal malignant neoplasms worldwide. The main treatment for GC is gastrectomy, which generally causes considerable metabolic stress to patients. To modulate cell function, maintain homeostasis of the immune response, reduce postoperative complications, and obtain favorable outcomes, physicians prescribe specific nutrients with immunomodulatory properties as supplementation to enteral or parenteral formulas, indicating immunonutrition. In the formulas, among the immunonutrients, glutamine, arginine, and n-3 polyunsaturated fatty acids are the most commonly used either alone or in combination. The present review summarizes and focuses on the evidence obtained from clinical trials and animal studies supporting the role of immunonutrients supplemented enterally or parenterally in total or subtotal gastrectomy. In addition, this review describes the possible molecular mechanisms underlying the protective action of these immunonutrients, which may contribute to therapeutic approaches to improve postoperative outcomes of gastrectomy. Combination of conventional therapy with immunonutrition seems to be a useful strategy to achieve synergistic effects in the treatment of GC patients.

Immunonutrition vs Standard Nutrition for Cancer Patients: A Systematic Review and Meta-Analysis (Part 1)

The aim of this study was to determine the efficacy of immunonutrition vs standard nutrition in cancer patients treated with surgery. Cochrane Central Register of Controlled Trials, EMBASE, MEDLINE, EBSCOhost, and Web of Science were searched. Sixty-one randomized controlled trials were included. Immunonutrition was associated with a significantly reduced risk of postoperative infectious complications (risk ratio [RR] 0.71 [95% CI, 0.64-0.79]), including a reduced risk of wound infection (RR 0.72 [95% CI, 0.60-0.87]), respiratory tract infection (RR 0.70 [95% CI, 0.59-0.84]), and urinary tract infection (RR 0.69 [95% CI, 0.51-0.94]) as well as a decreased risk of anastomotic leakage (RR 0.70 [95% CI, 0.53-0.91]) and a reduced hospital stay (MD -2.12 days [95% CI -2.72 to -1.52]). No differences were found between the 2 groups with regard to sepsis or all-cause mortality. Subgroup analyses revealed that receiving arginine + nucleotides + ω-3 fatty acids and receiving enteral immunonutrition reduced the rates of wound infection and respiratory tract infection. The application of immunonutrition at 25-30 kcal/kg/d for 5-7 days reduced the rate of respiratory tract infection. Perioperative immunonutrition reduced the rate of wound infection. For malnourished patients, immunonutrition shortened the hospitalization time. Therefore, immunonutrition reduces postoperative infection complications and shortens hospital stays but does not reduce all-cause mortality. Patients who are malnourished before surgery who receive arginine + nucleotides + ω-3 fatty acids (25-30 kcal/kg/d) via the gastrointestinal tract during the perioperative period (5-7 days) may show better clinical efficacy.

Perspective: Network Meta-analysis Reaches Nutrition Research: Current Status, Scientific Concepts, and Future Directions

Traditional pairwise meta-analysis (PMA) is a very useful method that pools evidence from one study design type if appropriate; its widespread use in nutrition research is an important phenomenon. Recently, a promising method for more advanced evidence-synthesis, called network meta-analysis (NMA), was introduced. NMA is an extension of PMA that enables simultaneous comparison of multiple interventions. NMA combines direct evidence (i.e., trials comparing 2 interventions directly) and indirect evidence (i.e., from a connected route via ≥1 comparators, e.g. placebo) in a network of studies. NMAs have the potential to advance knowledge in the field of nutrition as they provide insights that cannot be obtained by individual 2-arm randomized controlled trials or PMA. Thus, in this perspective paper, we aim to summarize the current (methodologic) status of published NMAs in nutrition research and emphasize advances and strengths in comparison with traditional PMA through specific examples, and highlight potential pitfalls and limitations. NMA is an emerging methodology in the field of nutrition research. A PubMed search identified only 23 nutrition research-related NMAs published since the inception of journals up to January 8, 2019 (61% of them published since 2017), compared with >5000 published PMAs. Moreover, we aim to highlight the scientific concepts and standards through the use of the following NMA example: "Which type of oils/solid fats offers the greatest impact on blood lipids?" In this regard, we discuss intervention definitions, transitivity/similarity, statistical methods, description and visualization of results, inconsistency, ranking, dissemination bias, assessing the certainty of evidence by Grading of Recommendations Assessment, Development and Evaluation, and reporting guidelines. We expect that rigorously conducted NMAs based on high-quality systematic reviews will become the new evidence synthesis benchmark in nutrition research. However, caution is warranted because abuse and misinterpretations of PMA and NMA findings could hamper the scientific field and possibly decision-making regarding public policy.

Risk factors for predicting progression from normal cognition to mild cognitive impairment: protocol for a systematic review and meta-analysis of cohort studies

INTRODUCTION

Mild cognitive impairment (MCI) often represents the earliest stage of Alzheimer's disease. There has been considerable research investigating specific risk factors regarding the progression from normal cognition to MCI. However, different studies have come to different conclusions on the impact of particular risk factors. Therefore, it is necessary to conduct a meta-analysis of the risk factors that predict cognitive disruption in individuals based on associations with MCI.

METHODS AND ANALYSIS

We will search seven electronic databases without time limit, including MEDLINE, EMBASE, The Cochrane Library, Web of Science, China National Knowledge Infrastructure, the Wan Fang Database and China Biology Medicine. Two researchers will independently screen for eligibility and perform data extraction. Data were extracted from cohort studies meeting the inclusive criteria according to the Newcastle Ottawa Scale (NOS) methods. A third member of the research team will be contacted when a consensus cannot be reached. Any disagreement will be settled by consensus. The NOS will be used to assess the quality of the studies. All analyses were performed using Stata V.15.1.

ETHICS AND DISSEMINATION

We will report this review in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis statement. We will disseminate our findings through a publication in a peer-reviewed journal. This systematic review does not require ethical approval as no primary data are collected.

PROSPERO REGISTRATION NUMBER

CRD42018109099.

Current status of the "enhanced recovery after surgery" program in gastric cancer surgery

Since the late 1990s, perioperative care through the enhanced recovery after surgery (ERAS, European Society for Clinical Nutrition and Metabolism [ESPEN]) program has spread. ERAS protocols aim to reduce surgical complications, improving postoperative outcomes and thereby saving resources by addressing various clinical elements through a multidisciplinary approach or based on evidence. In the field of gastric cancer, the philosophy of ERAS has gradually become accepted and, in 2014, consensus guidelines for enhanced recovery after gastrectomy were published. These guidelines consist of "procedure-specific" guidelines and "general (not procedure-specific) enhanced recovery items." In this review, we focused on the procedure-specific guidelines and tried to update the contents of every element of the procedure-specific guidelines. The procedure-specific guidelines consist of the following eight elements: "Preoperative nutrition," "Preoperative oral pharmaconutrition," "Access (of gastrectomy)," "Wound catheters and transversus abdominis plane block," "Nasogastric/Nasojejunal decompression," "Perianastomotic drains," "Early postoperative diet and artificial nutrition," and "Audit." On reviewing papers supporting these elements, it was reconfirmed that the recommendations of the guidelines are pertinent and valid. Four meta-analyses concerning the evaluation of ERAS protocols for gastric cancer were included in this review. Every study showed that the ERAS protocol reduced the cost and duration of hospital stay without increasing surgical complication rates, suggesting that ERAS is effective for gastric cancer surgery. However, it cannot be said that ERAS has achieved full penetration in Japan because most evidence is established in Western countries. Future studies must focus on developing a new ERAS protocols appropriate to Japanese conditions of gastric cancer.

Effect of Enteral Immunonutrition on Immune, Inflammatory Markers and Nutritional Status in Gastric Cancer Patients Undergoing Gastrectomy: A Randomized Double-Blinded Controlled Trial

Backgrounds: Enteral immunonutrition (EIN) has received increasing attention, however, evidence on its immunomodulatory and anti-inflammatory function in gastric cancer patients undergoing gastrectomy is poorly investigated. Objectives of this study were to evaluate the effect of EIN on immune function, inflammation response and nutrition status when compared to standard enteral nutrition (SEN). Methods: Totally 124 gastric cancer patients after gastrectomy were randomized to receive early 5-days postoperative EIN (formula enriched with arginine, glutamine, omega-3 fatty acids and nucleotide), or SEN. The primary end-points were CD4⁺ T-cells, CD3⁺ T-cells as well as counts of CD4⁺/CD8⁺, IgG, IgM, and IgA levels. Second-points included white blood cell (WBC), C-reactive protein (CRP), procalcitonin (PCT), tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6) levels and nutritional index such as serum albumin, prealbumin, and transferrin concentration. Results: There existed significant difference in primary end-points between EIN group and SEN group. The proportion of CD4⁺ T-cells, CD3⁺ T-cells and the counts of CD4⁺/CD8⁺, IgG, IgM, and IgA were higher in EIN group eventually. Meanwhile, the level of WBC, CRP and TNF-α were significantly lower in EIN group finally. But there were no other significant differences in nutritional markers between two groups. Conclusion: Early postoperative EIN significantly improves immune function and inflammatory response in gastric cancer patients undergoing gastrectomy.

Effects of exercise interventions for specific cognitive domains in old adults with mild cognitive impairment: A protocol of subgroup meta-analysis of randomized controlled trials

BACKGROUND

Mild cognitive impairment (MCI) is the clinical prognosis that leads to dementia. Early intervention of MCI is critical to protect against dementia. Exercise intervention has gained popularity for the management of MCI. Most current studies have focused only on improvements made by exercise interventions on the global/general cognitive function and/or a specific cognitive function. However, no studies have been performed on a subgroup analysis of the effects of exercise interventions on different cognitive domains of the elderly with MCI. The exploration of this issue will help to clarify the influence and through a preliminary analysis identify the level of influence of exercise interventions on particular cognitive domains, and it will provide the theoretical framework for the construction of precise exercise intervention strategies for MCI patients.

METHODS

A systematic review of electronic databases (MEDLINE, Embase, The Cochrane Library, Web of Science, CNKI, the Wan Fang Database, and CBM), supplemented by expert contact, reference and citation checking, and gray literature searches have been conducted. There is no restriction on language or publication status. Cochrane Handbook for Systematic Reviews of Interventions and add another 3 items according to PEDpro, including "the type of statistical analyses used (true intention-to-treat vs other)," "eligibility criteria," and "baseline comparability," are used to assess the risk of bias. Primary outcomes of interest are standardized measurements of executive functions, memory, language, processing speed, and attention. If possible, we conduct a meta-analysis to synthesize the evidence for each outcome.

RESULTS

This study will provide a high-quality synthesis of current evidence of exercise for MCI patients.

CONCLUSION

The conclusion of this systematic review will provide evidence to judge whether exercise is an effective intervention for patient with MCI and preliminary ranking of the effects of exercise on specific cognitive domains.

PROSPERO REGISTRATION NUMBER

CRD42018093902.

Survival Benefit of Three Different Therapies in Postoperative Patients With Advanced Gastric Cancer: A Network Meta-Analysis

Purpose: Gastric cancer is mainly treated by gastrectomy, the results of which were unsatisfactory without any adjuvant treatments. This study aimed to examine the performance of radiotherapy, chemotherapy, and chemoradiotherapy after surgery in order to acquire the optimal adjuvant treatment. Method: Embase and PubMed were retrieved to conduct a systematic research. Hazard ratios (HR) of overall survival (OS) and progression-free survival (PFS) as outcomes were calculated by synthesizing direct and indirect evidence to evaluate the efficacy of three treatments against surgery alone. The P-score ranking was utilized to rank the therapies. Consistency was assessed by heat plot. Begg's test was performed to evaluate publication bias. Results: A total of 35 randomized controlled studies (RCTs) with 8973 patients were included in our network meta-analysis (NMA). As for efficacy outcomes, OS and PFS of 1, 2, 3, and 5 years, all revealed chemoradiotherapy (CRT) as the best of three adjuvant therapies. Meanwhile, P-score ranking results also displayed that CRT was the optimal regimen. Additionally, radiotherapy (RT) and chemotherapy (CT) were two alternative options following CRT since RT performed well in short-term survival while CT could improve the long-term survival. Conclusion: CRT was the most recommended therapy to accompany surgery according to our results. However, no analysis about the safety of these three treatments was mentioned in our study. Further studies including safety outcomes were required to draw a more comprehensive conclusion.

Total iron-binding capacity is a novel prognostic marker after curative gastrectomy for gastric cancer

BACKGROUND

Patients with gastric cancer (GC) are affected by changes in iron status. Before surgery, GC patients are likely to have iron-deficiency anemia; and after gastrectomy, patients suffer from low nutritional status and low iron. This study investigated preoperative iron status associated with prognosis after curative gastrectomy for gastric cancer.

METHODS

We evaluated preoperative serum hemoglobin (Hgb), Fe and total iron-binding capacity (TIBC) in 298 patients who underwent curative gastrectomy for GC without preoperative chemotherapy, and analyzed these factors' associations with prognosis after surgery.

RESULTS

Of the 298 patients, 129 (43.2%) had low Hgb levels, and 33 (11.1%) had low TIBC (< 260 µg/dl) that was not associated with Hgb or Fe level. Patients with low TIBC were significantly associated with older age (≥ 65 years old; P = 0.0085), low albumin (< 3.9 g/dl; P = 0.0388) and high CRP (≥ 0.15 mg/dl; P = 0.0018) in multivariate analysis. Low Fe (< 60 µg/dl) was not associated with disease-free survival (DFS) or overall survival (OS); however, low Fe was associated with longer cancer-specific survival in Stage III GC patients (P = 0.0333). Both low Hgb and low TIBC were significantly associated with shorter DFS (Hgb: P = 0.0433; TIBC: P < 0.0001) and shorter OS (Hgb: P = 0.0352; TIBC: P < 0.0001). Low TIBC were significantly associated with shorter DFS (HR 2.167, 95% CI 1.231-3.639, P = 0.0086) and shorter OS (HR 2.065, 95% CI 1.144-3.570, P = 0.0173) in multivariate Cox hazard regression analysis.

CONCLUSIONS

Preoperative serum TIBC level of GC patients who undergo curative gastrectomy is a novel prognostic marker in univariate and multivariate analyses.

Acupuncture for constipation in patients with stroke: protocol of a systematic review and meta-analysis

INTRODUCTION

Constipation is one of the most common complications in patients with stroke. Acupuncture has gained increased popularity for the management of constipation. However, there is a lack of supportive evidence on the efficacy of acupuncture for poststroke constipation. This systematic review aims to collect and critically appraise all the available evidence about the efficacy and safety of the acupuncture for constipation in poststroke patients.

METHODS AND ANALYSIS

A comprehensive search of Pubmed, Embase, Cochrane Central Register of Controlled Trials, Web of Science, four Chinese databases (National Knowledge Infrastructure (CNKI), Chinese Biomedical Literatures database (CBM), Wanfang Digital Periodicals (WANFANG) and Chinese Science and Technology Periodicals (VIP) database), one Japanese medical database (National Institute of Informatics, CiNii) and one Korean medical database (Oriental Medicine Advanced Searching Integrated System, OASIS) will be conducted to identify randomised controlled trials of acupuncture for constipation in poststroke patients. There is no restriction on language or publication status. The primary outcome measure will be frequency of bowel movement. The risk of bias will be assessed using the approach recommended by Cochrane Handbook for Systematic Reviews of Interventions. We will conduct the meta-analysis to synthesise the evidence for each outcome, if possible. The heterogeneity will be statistically assessed using a χ2 test and I2 statistic. This protocol is developed following the guideline of Preferred Reporting Items for Systematic Reviews and Meta-analyses Protocols 2015.

ETHICS AND DISSEMINATION

The ethical approval is not required because no primary data are collected. The findings will be presented at scientific conferences or a peer-reviewed scientific journal.

PROSPERO REGISTRATION NUMBER

CRD42017076880.