For patients with gastric cancer who have already undergone abdominal operations earlier in life, a persistent question has shadowed surgical oncology for years: does a history of previous abdominal surgery compromise the safety and success of a subsequent minimally invasive gastrectomy? Surgeons have long suspected that adhesions, the fibrous bands of scar tissue that form after any abdominal operation, could tangle the anatomy, obscure key landmarks, and turn a carefully planned laparoscopic procedure into a prolonged and riskier undertaking. A new systematic review and meta-analysis published in BMC Cancer by a team led by Qi Yue and Yin Huang of the First Affiliated Hospital of Chongqing Medical University, with corresponding author Yang Luo, provides the most rigorous quantitative answer to date, and its findings are more reassuring than many clinicians feared, though not entirely without caveats.

The research team synthesized comparative observational studies that directly contrasted patients with and without previous abdominal surgery who underwent minimally invasive gastrectomy for gastric cancer. Searching four databases from their inception through February 18, 2026, the investigators identified six studies comprising seven comparative cohorts and up to 1,851 patients. The primary outcome of interest was overall postoperative complications, while secondary outcomes included conversion to open surgery, operative time, intraoperative blood loss, lymph node yield, and postoperative length of stay. Because randomized trials are neither practical nor ethical in this context, the meta-analysis of observational evidence represents the strongest available tool for quantifying how surgical history shapes perioperative outcomes, pooling odds ratios and mean differences with 95 percent confidence intervals under random-effects models to accommodate the inevitable statistical heterogeneity between studies.

The headline result concerns time on the operating table. Patients with previous abdominal surgery experienced an average of 11.17 additional minutes of operative time, with a 95 percent confidence interval spanning 3.80 to 18.54 minutes, a statistically significant difference. For an experienced surgical team, eleven minutes is not a trivial addition, since it reflects real technical work, likely the careful adhesiolysis needed to free the abdominal wall and operative field from scar tissue before the gastrectomy itself can proceed. Every additional minute under anesthesia and pneumoperitoneum carries a marginal physiological cost, and prolonged operative times are consistently associated with higher rates of surgical site infection and other complications in the broader surgical literature, making this finding clinically meaningful even though it is numerically modest.

Alongside the longer operations, the analysis detected a statistically significant but strikingly small increase in postoperative hospital stay, with a mean difference of just 0.07 days, at 95 percent confidence interval of 0.01 to 0.14 days. Expressed plainly, that is roughly one hundred minutes of additional hospitalization on average, a margin so slim that most clinicians would regard it as clinically negligible. The precision of this estimate, narrow enough to exclude the possibility of no difference, actually strengthens the reassuring interpretation: the systematic review found no evidence that prior surgery meaningfully delays recovery or discharge. In the context of enhanced recovery after surgery pathways, which have dramatically shortened gastric cancer hospitalization in many centers, this result suggests that a history of prior abdominal operations need not disqualify patients from such protocols.

On the outcomes that matter most to patient safety, the picture becomes more nuanced. Overall postoperative complications showed an odds ratio of 1.21 with a 95 percent confidence interval of 0.95 to 1.55, and conversion to open surgery showed an odds ratio of 1.75 with a confidence interval of 0.80 to 3.81. Neither result reached statistical significance, meaning the observed differences are compatible with chance. However, the authors were careful to note that clinically important increases in these risks could not be excluded. The confidence interval for complications brushes against a 55 percent relative increase at its upper bound, and the conversion confidence interval is wide enough to encompass everything from a substantial protective effect to a nearly fourfold increase in risk. This statistical ambiguity is not a weakness unique to this study; it is the honest consequence of pooling relatively few cohorts with limited event rates, and it defines the frontier of what current evidence can and cannot tell surgeons.

Encouragingly, two markers of oncological and technical quality showed no significant differences between the groups. Intraoperative blood loss and lymph node yield, the number of lymph nodes retrieved for pathological staging, were statistically indistinguishable between patients with and without previous surgery. Lymph node yield deserves particular emphasis in gastric cancer surgery, because adequate lymphadenectomy is fundamental to accurate staging and to the curative intent of gastrectomy. If adhesions and altered anatomy compromised the thoroughness of the dissection, one would expect to see reduced nodal harvests; the absence of such a difference suggests that skilled minimally invasive surgeons can navigate scarred abdomens without sacrificing oncological quality. Similarly, equivalent blood loss indicates that adhesiolysis does not translate into meaningful hemorrhagic risk in experienced hands.

Methodologically, the study adhered to established standards for evidence synthesis. The team followed PRISMA reporting guidelines and assessed risk of bias using ROBINS-E, the Risk Of Bias In Non-randomized Studies of Exposures tool, which is specifically designed to evaluate observational comparative studies rather than borrowing instruments intended for randomized trials. This choice reflects a maturing meta-analytic practice: since the exposure in question, previous abdominal surgery, cannot be randomized, the validity of conclusions rests on transparent assessment of confounding, selection bias, and measurement error in the underlying cohorts. The inclusion criteria also demanded genuine comparative designs, excluding single-arm case series that would inflate apparent safety by omitting an appropriate control group.

The clinical implications radiate outward from the operating theater to the multidisciplinary tumor board. Gastric cancer is among the leading causes of cancer mortality worldwide, and minimally invasive gastrectomy, whether laparoscopy-assisted distal or total gastrectomy, has become the standard of care at high-volume centers, offering patients less pain, faster recovery, and fewer wound complications than open surgery. A large fraction of gastric cancer patients, particularly in East Asian populations where screening detects tumors in older adults, carry surgical histories that include appendectomy, cholecystectomy, cesarean section, or prior colorectal procedures. The new evidence indicates that such histories should inform, rather than forbid, a minimally invasive approach. As the authors conclude, the findings highlight the need for individualized surgical planning, in which the type, location, and recency of prior operations, along with surgeon experience, shape the operative strategy.

Several important limitations temper the strength of the conclusions and point toward future research. The pooled analysis rests on only six studies and seven cohorts, so the estimates carry wide uncertainty, especially for the rarer outcomes such as conversion. Observational studies inherently cannot exclude residual confounding; patients with prior surgery may differ systematically in body mass index, tumor stage, comorbidity burden, or institutional referral patterns in ways the original studies did not fully adjust. Heterogeneity in the definition of previous abdominal surgery, whether limited to upper abdominal procedures or inclusive of all laparotomies and laparoscopies, may also blur true subgroup effects, since lower abdominal scar tissue is generally less disruptive to gastric mobilization than adhesions in the upper abdomen. Future studies stratifying by the anatomical site of prior surgery, and by surgeon volume, would sharpen the clinical calculus considerably.

For now, the message to patients is broadly reassuring. A history of previous abdominal surgery will make a minimally invasive gastrectomy take a few minutes longer and may, in unresolved ways, modestly influence complication and conversion risks, but it does not appear to undermine the essential quality of cancer surgery or materially delay recovery. The study, which received no specific grant funding and declared no competing interests, was published open access on October 13, 2026, under a Creative Commons license, allowing clinicians worldwide to weigh its evidence directly. As minimally invasive techniques continue to expand across surgical oncology, this synthesis offers a data-driven foundation for the conversations surgeons must have with every scarred abdomen on the operating table: informed, quantified, and centered on individualized care rather than blanket exclusion.

Subject of Research: Perioperative outcomes of minimally invasive gastrectomy for gastric cancer in patients with previous abdominal surgery

Article Title: Impact of previous abdominal surgery on perioperative outcomes after minimally invasive gastrectomy for gastric cancer: an evidence synthesis and quantitative analysis

Article References: Yue, Q., Huang, Y., Yu, R.-X., Li, K.-Q., Fu, D.-H., Wang, L., Shi, Y.-Y., & Luo, Y. (2026). Impact of previous abdominal surgery on perioperative outcomes after minimally invasive gastrectomy for gastric cancer: an evidence synthesis and quantitative analysis. BMC Cancer. https://doi.org/10.1186/s12885-026-17123-7

Image Credits: AI Generated

DOI: 10.1186/s12885-026-17123-7

Keywords: gastric cancer, minimally invasive gastrectomy, previous abdominal surgery, meta-analysis, postoperative complications, surgical adhesions, lymph node yield, conversion to open surgery, operative time, surgical oncology, Impact, previous