Efficacy and outcome of extensive intraoperative peritoneal lavage plus surgery vs surgery alone with advanced gastric cancer patients

Oncologic Impact of Conservative Treatment Compared with Surgical Treatment of Anastomotic Leakage Following Colorectal Cancer Surgery: A Retrospective Study

Objectives

Differences in oncological outcomes between conservative and surgical treatments for anastomotic leakage (AL) in patients undergoing colorectal cancer surgery remain unclear.

Methods

From July 2011 to June 2020, 385 patients underwent curative resection with double-stapling anastomosis for left-sided colon and rectal cancers. Among them, 33 patients who experienced AL were retrospectively evaluated and categorized into two groups: conservative (n = 20) and surgical (n = 13). In the surgical group, abdominal lavage using a sufficient amount of normal saline was performed during reoperation. The primary endpoint was the 3-year cumulative incidence of local recurrence (LR).

Results

Seven (21.2%) patients in the conservative group experienced LR, while none in the surgical group. Survival analysis indicated no differences in overall and recurrent-free survival. However, the 3-year cumulative incidence of LR was significantly lower in the surgical group than in the conservative group (0% versus 31.3%, p=0.045).

Conclusions

Differences in AL management were associated with oncological outcomes, specifically a decreased LR. Therefore, surgeons should consider our findings when determining the most appropriate AL treatment to improve oncological outcomes.

Extensive intraoperative peritoneal lavage with surgery, compared to surgery alone, for patients diagnosed with gastric cancer: a systematic review and meta-analysis of randomized controlled trials

BACKGROUND

Gastric cancer ranks as the fifth most frequently diagnosed cancer and the seventh most prevalent overall. The lifetime risk of developing gastric cancer is 1.87% for males and 0.79% for females worldwide.

AIM

This systematic review and meta-analysis aimed to determine whether extensive intraoperative peritoneal lavage (EIPL) provides short-term benefits or improved survival outcomes for patients undergoing gastrectomy.

METHODS

A comprehensive search spanned PubMed, Embase, Cochrane Library, clinicaltrials.gov, and Web of Science, from their inception up to October 2023, adhering to predefined inclusion and exclusion criteria. The quality of the studies was analyzed using the Cochrane Collaboration Risk of Bias Tool. Data analysis was done using Review Manager 5.3, utilizing a random-effects model.

RESULTS

Our analysis incorporated seven randomized controlled trials with 2602 patients. The follow-up time for all outcomes varied from 30-60 months. For our primary outcomes, EIPL demonstrated a significant benefit over surgery alone in terms of recurrence (RR=0.73; 95% CI: 0.65-0.83, P <0.00001) and postoperative complications (RR=0.67; 95% CI: 0.51-0.87, P =0.003). For our secondary outcomes, postoperative hospital stay (MD=-0.35; 95% CI: -1.11 to 0.41; P =0.37), 3-year overall survival (OR=1.44; 95% CI: 0.84-2.47; P =0.19), 3-year disease-free survival (HR=0.93; 95% CI: 0.78-1.13; P =0.48), and time to first flatus (MD=-0.17; 95% CI: -0.35 to 0.01; P =0.06), no statistically significant differences were observed between the EIPL and control groups.

CONCLUSION

While there is a marginal difference in survival outcomes, EIPL holds promise in significantly reducing overall cancer recurrence and suggests an enhancement in postoperative recovery.

Efficacy and Safety of Extensive Intraperitoneal Lavage for Patients with Gastric Cancer - A Systematic Review and Meta-analysis

PURPOSE

Extensive  intraperitoneal lavage (EIPL) is a novel therapeutic intervention that aims to limit the chance of peritoneal metastasis during gastrectomy. Clinical trials on using EIPL after gastrectomy show controversial results. We aimed to summarize the evidence of efficacy and safety for using EIPL after gastrectomy to limit the possibility of peritoneal metastasis and improve survival.

METHODS

A literature search on PubMed, Scopus, Embase, and Web of Sciences was conducted till June 2023 to identify eligible RCTs that assess the efficacy and safety of EIPL after gastrectomy. The hazard ratio with 95% CI was used to determine the survival probability, the risk ratio with 95% CI was used to assess the surgical outcomes, and ROB-2 and GRADE guidelines were used to assess the risk of bias and the certainty of evidence respectively.

RESULTS

Six eligible studies with a total of 1993 patients were included in the meta-analysis. Regarding survival benefits, the survival of the EIPL group did not differ significantly from the non-EIPL group, and the pooled HR of overall survival was 0.86 (95% CI 0.58-1.26) P = 0.44, the disease-free survival was 0.81 (0.58-1.13) P = 0.21, and peritoneal recurrence-free survival was 0.97 (0.79-1.2) P = 0.25. There is no significant association between EIPL and short-term postoperative outcomes. The use of EIPL does not appear to affect postoperative mortality, infection, anastomotic leakage, bleeding, ileus, or hospital stay.

CONCLUSION

Our study yielded insufficient evidence about the survival benefits and surgical outcomes of EIPL in patients with gastric cancer after gastrectomy. Therefore, it is not recommended for treating gastric cancer patients.

Gene polymorphisms associated with sudden decreases in heart rate during extensive peritoneal lavage with distilled water after gastrectomy

BACKGROUND

Our previous study found that the telomerase-associated protein 1 (TEP1, rs938886 and rs1713449) and homo sapiens RecQ like helicase 5 (RECQL5, rs820196) single nucleotide polymorphisms (SNPs) were associated with changes in heart rate (HR) ≥ 30% during peritoneal lavage with distilled water after gastrectomy. This study established a single tube method for detecting these three SNPs using two-dimensional (2D) polymerase chain reaction (PCR), and investigated whether SNP-SNP and SNP-environment interactions increase the risk of high HR variability (HRV).

AIM

To investigate whether genotypes, genetic patterns, SNP-SNP and SNP-environment interactions were associated with HRV.

METHODS

2D PCR was used to establish a single-tube method to detect TEP1 rs938886 and rs1713449 and RECQL5 rs820196, and the results were compared with those of sanger sequencing. After adjusting for confounders such as age, sex, smoking, hypertension, and thyroid dysfunction, a nonconditional logistic regression model was used to assess the associations between the genotypes and the genetic patterns (codominant, dominant, overdominant, recessive, and additive) of the three SNPs and a risk ≥ 15% or ≥ 30% of a sudden drop in HR during postoperative peritoneal lavage in patients with gastric cancer. Gene-gene and gene-environment interactions were analyzed using generalized multifactor dimensionality reduction.

RESULTS

The coincidence rate between the 2D PCR and sequencing was 100%. When the HRV cutoff value was 15%, the patients with the RECQL5 (rs820196) TC genotype had a higher risk of high HRV than those who had the TT genotype (odds ratio = 1.97; 95%CI: 1.05-3.70; P = 0.045). Under the codominant and overdominant models, the TC genotype of RECQL5 (rs820196) was associated with a higher risk of HR decrease relative to the TT and TT + CC genotypes (P = 0.031 and 0.016, respectively). When the HRV cutoff value was 30%, patients carrying the GC-TC genotypes of rs938886 and rs820196 showed a higher HRV risk when compared with the GG-TT genotype carriers (P = 0.01). In the three-factor model of rs938886, rs820196, and rs1713449, patients carrying the GC-TC-CT genotype had a higher risk of HRV compared with the wild-type GG-TT-CC carriers (P = 0.01). For rs820196, nonsmokers with the TC genotype had a higher HRV risk compared with nonsmokers carrying the TT genotype (P = 0.04). When the HRV cutoff value was 15%, patients carrying the TT-TT and the TC-CT genotypes of rs820196 and rs1713449 showed a higher HRV risk when compared with TT-CC genotype carriers (P = 0.04 and 0.01, respectively). Patients carrying the GC-CT-TC genotypes of rs938886, rs1713449, and rs820196 showed a higher HRV risk compared with GG-CC-TT genotype carriers (P = 0.02). When the HRV cutoff value was 15%, the best-fitting models for the interactions between the SNPs and the environment were the rs820196-smoking (P = 0.022) and rs820196-hypertension (P = 0.043) models. Consistent with the results of the previous grouping, for rs820196, the TC genotype nonsmokers had a higher HRV risk compared with nonsmokers carrying the TT genotype (P = 0.01).

CONCLUSION

The polymorphism of the RECQL5 and TEP1 genes were associated with HRV during peritoneal lavage with distilled water after gastrectomy.