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World J Gastroenterol. Apr 28, 2026; 32(16): 117799
Published online Apr 28, 2026. doi: 10.3748/wjg.v32.i16.117799
Plasma proteomic profiling of gastric cancer: Super minimally invasive surgery vs organ-resection on trauma immunity
Yao-Qian Yuan, Qian-Qian Chen, Pan Xiao, Hui-Kai Li, Kun-Ming Lv, Shuai Tian, Jing Hao, En-Qiang Linghu, Department of Gastroenterology, The First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
Kun-Ming Lv, Hui Shi, Department of Gastroenterology, The Second Medical Center of Chinese PLA General Hospital, Beijing 100853, China
Yang Yan, Department of General Surgery, The First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
ORCID number: Qian-Qian Chen (0009-0006-9078-5711); Hui Shi (0009-0008-9300-5308); Jing Hao (0009-0009-4910-8059); Yang Yan (0000-0001-8019-7314); En-Qiang Linghu (0000-0003-4506-7877).
Co-first authors: Yao-Qian Yuan and Qian-Qian Chen.
Co-corresponding authors: Yang Yan and En-Qiang Linghu.
Author contributions: Yuan YQ and Chen QQ made equal contributions as co-first authors; Linghu EQ and Chen QQ contributed to conceptualization and supervision; Yuan YQ and Xiao P contributed to experiments; Yuan YQ, Li HK, Lv KM, Tian S, Shi H, and Hao J contributed to data collection and analysis; Yan Y contributed to literature review; Yuan YQ contributed to writing draft; Linghu EQ, Chen QQ, Li HK, Yan Y, Shi H, and Hao J contributed to surgical procedures; Linghu EQ and Yan Y made equal contributions as co-corresponding authors. All authors approved the final format of the submitted manuscript.
Supported by National Key Research and Development Program of China, No. 2022YFC2503601.
Institutional review board statement: The study was reviewed and approved by the Institutional Review Board of the Chinese PLA General Hospital, No. S2023-188-01.
Clinical trial registration statement: This study is registered at Chinese Clinical Trial Registry, No. ChiCTR2500097111.
Informed consent statement: Written informed consent was obtained from all individual participants included in the study.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
CONSORT 2010 statement: The authors have read the CONSORT 2010 Statement, and the manuscript was prepared and revised according to the CONSORT 2010 Statement.
Data sharing statement: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Corresponding author: En-Qiang Linghu, MD, Chief Physician, Professor, Department of Gastroenterology, The First Medical Center of Chinese PLA General Hospital, No. 28 Fuxing Road, Haidian District, Beijing 100853, China. linghuenqiang@vip.sina.com
Received: December 16, 2025
Revised: January 18, 2026
Accepted: February 12, 2026
Published online: April 28, 2026
Processing time: 121 Days and 17.4 Hours

Abstract
BACKGROUND

Gastric cancer remains one of the leading causes of cancer-related mortality worldwide, and surgery remains the cornerstone of curative treatment. However, the extent of surgical resection may significantly influence postoperative immune and inflammatory responses, which are closely related to recovery and complication rates.

AIM

To compare the effects of super minimally invasive surgery (SMIS) and organ-resection surgery (ORS) for gastric cancer on postoperative immune and inflammatory responses.

METHODS

This prospective study included patients with gastric cancer who underwent SMIS or conventional ORS between May 2023 and April 2024. Peripheral blood samples were collected one day preoperatively and on the third postoperative day. Plasma levels of 92 trauma- and immunity-related proteins were quantified using the Olink proteomic platform. Differentially expressed proteins (DEPs) before and after surgery were identified within each group, and comparative analyses were performed to assess immune-inflammatory alterations between SMIS and ORS.

RESULTS

A total of 38 patients were included: 20 in the SMIS group and 18 in the ORS group. Baseline demographic and clinical characteristics were comparable between the groups (all P > 0.05). Proteomic analysis identified 13 DEPs after SMIS and 37 DEPs after ORS. Nine DEPs were shared between the surgical models (TMPRSS15, CNTN2, HPGDS, PLXDC1, NPPC, CA14, calcitonin, platelet-derived growth factor C, and nitric oxide synthase). Among these, calcitonin, platelet-derived growth factor C, and nitric oxide synthase showed the most prominent postoperative upregulation, particularly after ORS, indicating a stronger trauma-related immune response than SMIS.

CONCLUSION

SMIS for gastric cancer was associated with a reduced postoperative immune-inflammatory response and lower trauma-related protein expression than ORS, suggesting better immune preservation and lower surgical stress.

Key Words: Gastric cancer; Organ-resection surgery; Super minimally invasive surgery; Trauma immunity; Inflammatory response

Core Tip: The optimal extent of surgical intervention for gastric cancer remains controversial, particularly with respect to its impact on postoperative immune homeostasis. This study integrates super minimally invasive surgery concepts with proteomic profiling to investigate immune-inflammatory alterations following different surgical strategies, providing mechanistic insights that may support more individualized, trauma-conscious surgical decision-making in early gastric cancer.



INTRODUCTION

Gastric cancer is one of the most prevalent malignant neoplasms globally, with high incidence and mortality rates that pose a significant public health threat[1]. In China, it ranks as the second most common cancer, substantially affecting public health and life expectancy[2]. The high burden of gastric cancer highlights the critical need for early diagnosis and treatment. Advances in medical technology have led to diversified treatment approaches, with surgery, chemotherapy, radiotherapy, targeted therapy, and immunotherapy as the primary modalities[3]. Among these, surgery remains the mainstay of treatment for gastric cancer and the only curative option.

Surgical intervention inevitably causes direct mechanical tissue injury, local hemorrhage, and ischemia, followed by hypoxic cellular stress and ischemia-reperfusion injury, which activate innate and adaptive immune responses at both local and systemic levels[4,5]. Dysregulation of the host response increases the incidence of infectious complications, impairs wound healing, and adversely affects other clinical outcomes, including length of hospital stay, mortality, and long-term cognitive function[6,7]. However, the clinical manifestations of postoperative inflammation can be insidious[8].

Among the various surgical approaches, super minimally invasive surgery (SMIS) and conventional organ-resection surgery (ORS) are the two predominant treatment modalities in current clinical practice. SMIS offers several advantages over ORS, including reduced trauma, preservation of organ function, lower postoperative pain, and a reduced risk of infection and contamination[9]. SMIS has become a standard of care for early-stage gastric cancer. However, SMIS has limitations, including the need for surgeons to have advanced endoscopic skills to perform the procedure successfully. Accordingly, this exploratory pilot study aims to compare plasma levels of organ damage-related molecules following SMIS and ORS to determine which surgical method is more deleterious to the human body, an area that has not been previously explored. The findings will provide a scientific foundation for the targeted development of postoperative intervention strategies.

MATERIALS AND METHODS
Study design and grouping

This study was designed as a prospective, exploratory pilot study. In accordance with current clinical guidelines and ethical standards, the surgical strategy (SMIS or ORS) was determined by clinicians based on patients’ clinicopathologic characteristics (e.g., tumor stage and differentiation). Because the extent of surgery is strictly dictated by disease severity, random allocation was not feasible in this real-world clinical setting.

The study enrolled 38 consecutive patients with gastric cancer (20 in the SMIS group and 18 in the ORS group) who were hospitalized at the First Medical Center of Chinese PLA General Hospital between May 2023 and April 2024 and scheduled for surgical treatment. Written informed consent was obtained from all participants. Ethical approval was granted by the Ethics Committee of the Chinese PLA General Hospital, No. S2023-188-01.

The surgical approaches for the two groups were as follows: (1) The SMIS group underwent endoscopic high-frequency electrodissection, endoscopic mucosal resection, pre-incision endoscopic mucosal resection, or endoscopic submucosal dissection; and (2) The ORS group underwent laparoscopic-assisted radical gastrectomy for gastric cancer, robot-assisted radical total gastrectomy, laparoscopic-assisted radical resection of distal gastric cancer, laparoscopic total gastrectomy, or total gastrectomy.

In this study, the decision to perform SMIS or ORS was made by clinicians based on patients’ clinicopathologic characteristics. The distinction between the groups was based on the extent of surgical intervention, specifically whether the stomach was partially or completely removed.

Comparative analyses were performed across the following subgroups: Preoperative vs postoperative comparisons within the SMIS group and within the ORS group. The subgroups were defined as follows: GEP = SMIS preoperative, GEA = SMIS postoperative, GSP = ORS preoperative, and GSA = ORS postoperative.

Data collected included: (1) General data. Sex, age, body mass index (BMI), smoking history, and alcohol consumption history; and (2) Clinical characteristics and treatment data. Past medical history, prior medication use, preoperative medication use, Helicobacter pylori infection history, tumor pathology type, preoperative blood counts, surgical procedure, postoperative temperature changes, antibiotic use during hospitalization, antipyretic and analgesic drug use during hospitalization, time to discharge after surgery, and hospitalization costs.

Patient inclusion and exclusion criteria

Inclusion criteria: (1) Pathologically confirmed diagnosis of gastric cancer or high-grade intraepithelial neoplasia; (2) Elective surgery with signed informed consent for surgical treatment; (3) Age 18-80 years, male or female; (4) Willingness to cooperate with the study; and (5) No contraindications to endoscopic or surgical procedures.

Exclusion criteria: (1) Documented history of gastrointestinal surgery; (2) History of palliative resection surgery; (3) Presence of malignant tumors at other sites; (4) Severe organ dysfunction; (5) Administration of antibiotics or anti-inflammatory medications within 1 week before surgery; (6) Intellectual disability; (7) Patients who did not meet surgical indications or refused the procedure; and (8) Patients requiring other study-related treatments due to concurrent illnesses during the study period.

Olink plasma proteomics profiling technology

Normalized protein expression: The blood sample collection protocol was as follows. Samples were collected from two patient groups (SMIS and ORS) at two time points. The first set of samples was collected 1 day before the surgical procedure, and the second set was collected on postoperative day (POD) 3. Specifically, preoperative sampling was chosen to capture patients’ baseline immune status, independent of the acute stress, anesthesia, or blood transfusions associated with surgery. This 24-hour window also minimizes potential confounding from longer-term variables such as tumor progression or nutritional changes. The selection of POD 3 is based on the biological kinetics of the systemic inflammatory response, as inflammatory mediators, including cytokines, chemokines, and damage-associated molecular patterns, typically reach significant or peak levels 48-72 hours after surgical trauma. Furthermore, POD 3 sampling avoids immediate, transient fluctuations related to residual anesthesia, fluid resuscitation, and the acute hormonal stress response that are most pronounced within the first 24 postoperative hours[10,11]. Samples were then centrifuged at 3500 rpm (2500 × g) for 10 minutes at 4 °C. After centrifugation, the samples were stored at -80 °C.

EDTA plasma samples from 20 patients in the SMIS group and 18 in the ORS group (40 plasma samples from the SMIS group and 36 plasma samples from the ORS group) were analyzed using the Olink Proseek Organ Injury Panel (PEA technology; Shanghai Biotech, Shanghai, China) to assess organ damage markers. The panel includes 92 proteins and uses protein-binding plates in which targets are recognized by pairs of oligonucleotide-labeled antibody probes. The resulting DNA sequences were quantified by microfluidic real-time polymerase chain reaction amplification of the oligonucleotide sequences. Internal and external controls were used to generate threshold cycle (Ct) data for quality control and normalization. Normalized protein expression (NPX) values were calculated by normalizing Ct values using the extension control, inter-plate control, and calibration factor. NPX values were used as the final assay readout; NPX represents relative protein abundance after log2 transformation of the protein values by Olink. Additional details are available on the Olink website (https://www.olink.com).

Principal component analysis: Principal component analysis aggregates signal values from protein samples to generate a new set of composite variables. Typically, two to three composite variables are selected to capture as much information as possible from the original variables, thereby reducing dimensionality based on the specific problem being addressed.

Cluster analysis: Cluster analysis is a widely used exploratory data analysis technique that groups and classifies data based on similarity. Patterns within clusters are highly similar, whereas similarities between different clusters are comparatively low.

Differential protein analysis: The method for screening differentially expressed proteins (DEPs) involved using the PEA technique, the core technology of the Olink proteomics assay, to analyze plasma samples. Differential protein analysis was performed using normalized NPX values. NPX is a quantitative representation of protein levels that aims to minimize variation between internal test components and external standards. Olink standard difference analysis utilizes Student’s t-test (or ANOVA when comparing more than two groups) to calculate protein expression differences from normalized NPX data under various experimental conditions. Differential protein information is identified by screening for conditions with P values < 0.05 (Student’s t-test). Subsequent differential protein expression analysis is then performed, leading to the creation of heat maps and box plots.

Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analysis: Functional enrichment analysis was performed only for statistically significant DEPs (P < 0.05). These DEPs were compared with the full panel of 92 proteins quantified in the Olink assay, which served as the background reference set. Enrichment significance was evaluated using Fisher’s exact test (P < 0.05) to identify overrepresented Gene Ontology (GO) terms and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. The analysis was conducted at the GO term or KEGG pathway level, providing insight into overall functional enrichment patterns among the DEPs.

Statistical analysis

Statistical analyses were performed using SPSS version 27.0. Continuous variables are presented as the mean ± SD or median (interquartile range), as appropriate. Comparisons between two independent groups were performed using the independent-samples t test or the Mann-Whitney U test, depending on the data distribution. Paired comparisons before and after surgery within the same group were conducted using paired t tests or Wilcoxon signed-rank tests. Categorical variables were compared using the χ2 test or Fisher’s exact test, as appropriate. A generalized estimating equation was used to analyze repeated measurements over time. All statistical tests were two-sided, and a P value < 0.05 was considered statistically significant. Owing to the exploratory nature of this study, no adjustment for multiple comparisons was performed.

RESULTS
Clinical characteristics of gastric cancer patients in the SMIS and ORS groups

A total of 38 patients were included in the study, with 20 in the SMIS group and 18 in the ORS group. The SMIS group comprised 18 males and 2 females, with a mean age of 61 years (range, 55.5-72 years), whereas the ORS group comprised 13 males and 5 females, with a mean age of 60.5 years (range, 46.5-65 years). As shown in Table 1, no statistically significant differences were observed between the groups in sex, age, BMI, history of Helicobacter pylori infection, history of chronic diseases, preoperative blood counts, prior medication use, smoking, or alcohol consumption (all P > 0.05).

Table 1 Comparison of general data of gastric cancer patients in two groups, n (%)/median (interquartile range)/mean ± SD.
Variables
SMIS (n = 20)
ORS (n = 18)
P value
Gender0.164
Male18 (90)13 (72)
Female2 (10)5 (28)
Age (years)61 (55.5, 72)60.5 (46.5 65)0.219
BMI (kg/m2)24.95 (23.6, 27.25)22.95 (21.15, 26.05)0.106
Smoking history7 (35)7 (39)1.000
History of alcohol use10 (50)9 (50)1.000
History of Helicobacter pylori infection3 (15)3 (17)1.000
Hypertension10 (50)6 (33)0.342
Diabetes5 (25)4 (22)1.000
Coronary heart disease, pre-operative blood test4 (20)1 (6)0.344
White blood cells (× 109/L)6.085 (5.515, 7.57)5.57 (4.385, 7.185)0.148
Neutrophils (× 109/L)0.558 ± 0.7210.608 ± 0.9490.076
Lymphocytes (× 109/L)0.335 ± 0.7290.293 ± 0.8530.12
Monocytes (× 109/L)0.0775 (0.065, 0.088)0.074 (0.057, 0.082)0.342
Previous medication history1.000
Anti-inflammatory drugs (anticoagulants, anti-platelet drugs, non-steroidal anti-inflammatory drugs, hormonal drugs)2 (10)1 (5.6)
No anti-inflammatory medication18 (90)17 (94.4)

A comparison of clinical characteristics and treatment plans showed statistically significant differences between the two groups in pathological tumor type (P < 0.001), type of postoperative antibiotics (P < 0.05), duration of antibiotic therapy (P < 0.001), use of analgesia (P < 0.001), length of postoperative hospital stay (P < 0.05), postoperative body temperature, and postoperative hospitalization costs (P < 0.001) (Table 2).

Table 2 Comparison of clinical characteristics and treatment options data, n (%)/median (interquartile range).

SMIS (n = 20)
ORS (n = 18)
P value
Tumor pathology type< 0.001
Severe atypical hyperplasia (high-grade intraepithelial neoplasia)4 (20)0
High-grade intraepithelial neoplasia with carcinoma9 (45)0
Moderately differentiated adenocarcinoma3 (15)0
Poorly differentiated adenocarcinoma06 (33.3)
Low and intermediate grade glandular cancer2 (10)3 (16.7)
Signet ring cell carcinoma1 (5)0
Low-to-moderately differentiated adenocarcinoma combined with signet ring cell carcinoma04 (20)
Undifferentiated adenocarcinoma combined with signet ring cell carcinoma1 (5)5 (25)
Number of types of antibiotics used 0.03829
Use of 1 antibiotic9 (45)2 (11)
Use of 2 antibiotics4 (20)7 (39)
Use of 3 antibiotics5 (25)9 (50)
Use of 4 antibiotics00
No antibiotics used2 (10)0
Duration of antibiotic use2 (2, 3)6 (5.5, 7)< 0.001
Postoperative analgesia< 0.001
Yes2 (10)17 (94.4)
No18 (90)1 (5.6)
Length of stay after surgery5 (5, 7)7 (6, 7.5)0.002849
Hospitalization costs24710.9 (20873.79, 31738.355)93442.45 (84969.0, 101357.365)< 0.001
Postoperative temperature0.01544
Low-grade fever (37.3-38.0 °C)1 (5)7 (38.9)
Medium fever (38.1-39.0 °C)2 (10)1 (5.6)
High fever (> 39.1 °C)01 (5.6)
Normal temperature17 (85)9 (50)
Olink biomarker analysis

Differential protein analysis: We performed preoperative and postoperative differential protein expression analysis on the two groups (Figure 1). Comparative analysis of the SMIS group before and after surgery identified 13 DEPs, of which 4 were upregulated post-SMIS (Figure 2). A similar analysis of the ORS group revealed 37 DEPs, with 29 upregulated after ORS (Figure 3). A total of nine DEPs were identified in both the SMIS group and ORS group. These included TMPRSS15, CNTN2, HPGDS, PLXDC1, NPPC, CA14, calcitonin (CALCA), platelet-derived growth factor C (PDGFC), and nitric oxide synthase (NOS3) (Figure 4). Among these nine common DEPs, CALCA, PDGFC, and NOS3 were found to be upregulated post-surgically in comparison to the pre-surgical state. Notably, CALCA, PDGFC, and NOS3 showed the greatest increase following ORS (Figure 5).

Figure 1
Figure 1 Heatmap illustrating the differential expression of proteins in the super minimally invasive surgery and organ-resection surgery pre- and postoperative groups. A: Thirteen differentially expressed proteins generated by comparative analysis of the pre- and postoperative super minimally invasive surgery groups; B: Thirty-seven differentially expressed proteins generated by comparative analysis of the pre- and postoperative organ-resection surgery groups (P < 0.05). GEA: Postoperative period of super minimally invasive surgery; GEP: Preoperative period of super minimally invasive surgery; GSA: Postoperative period of organ-resection surgery; GSP: Preoperative period of organ-resection surgery.
Figure 2
Figure 2 Boxplot of the four differentially expressed proteins among the 13 differentially expressed proteins in the super minimally invasive surgery group. These differentially expressed proteins are endothelial nitric oxide synthase, calcitonin, CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase1, platelet-derived growth factor C. NOS3: Nitric oxide synthase; CALCA: Calcitonin; ST3GAL1: CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase1; PDGFC: Platelet-derived growth factor C; GEA: Postoperative period of super minimally invasive surgery; GEP: Preoperative period of super minimally invasive surgery; NPX: Normalized protein expression.
Figure 3
Figure 3 Boxplot of 29 differentially expressed proteins that were upregulated after organ-resection surgery. GSA: Postoperative period of organ-resection surgery; GSP: Preoperative period of organ-resection surgery; NPX: Normalized protein expression.
Figure 4
Figure 4 Boxplot of the nine differentially expressed proteins common to the organ-resection surgery and super minimally invasive surgery groups. GEA: Postoperative period of super minimally invasive surgery; GEP: Preoperative period of super minimally invasive surgery; GSA: Postoperative period of organ-resection surgery; GSP: Preoperative period of organ-resection surgery; NPX: Normalized protein expression.
Figure 5
Figure 5 Pre- and postoperative super minimally invasive surgery and organ-resection surgery. Three commonly upregulated differential expression proteins and the upregulation amplitude display diagram. CALCA: Calcitonin; PDGFC: Platelet-derived growth factor C; NOS3: Nitric oxide synthase 3; GEA: Postoperative period of super minimally invasive surgery; GEP: Preoperative period of super minimally invasive surgery; GSA: Postoperative period of organ-resection surgery; GSP: Preoperative period of organ-resection surgery.

The 9 DEPs were functionally classified as follows. (1) Proteins involved in the repair and regeneration of cells: CNTN2[12], NOS3[13]; (2) Protein involved in immune and inflammatory processes: HPGDS[14,15], PDGFC[16-18], NOS3[19]; (3) Protein involved in biological metabolism: NPPC[20,21], CA14[22], CALCA[23]; (4) Cancer-related protein: PLXDC1[24,25], PDGFC[26-28], NOS3[29]; and (5) Trauma-related: TMPRSS15[30].

The four DEPs that were upregulated after SMIS surgery were functionally classified as follows. (1) Proteins involved in the repair and regeneration of cells: NOS3[13], PDGFC[31]; (2) Protein involved in immune and inflammatory processes: PDGFC[16]; NOS3[19,32]; CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase1[33]; (3) Protein involved in biological metabolism: CALCA[23]; and (4) Cancer-related protein: CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase1[34,35].

The 29 DEPs that were found to be upregulated after ORS were functionally classified as follows: (1) Proteins involved in the repair and regeneration of cells: CALR[36,37], TOP2B[38], RRM2B[39,40], NUCB2[41], MAX[42], FKBP1B, PDGFC[43], YES1[44], PXN[45,46], ENAH[47,48]; (2) Protein involved in immune and inflammatory processes: SIRT5[49], PDGFC[18,27], FGR[50-52], STXBP3[53,54], PLIN1[55,56], PVALB[57], MAP4K5[58], LAT2[59], BANK1[60,61], RARRES1[62,63], NOS3[32], ERBB2IP[64]; (3) Protein involved in biological metabolism: NUCB2[65,66], PDGFC[28], PLIN1[67], PDP1[68], NOS3[69], FOXO1[70], SIRT5[71,72], CALCA[73], PTPRJ[74]; and (4) Cancer-related protein: SIRT5[75], NUCB2[76], CALR[77], PDGFC[26], YES1[44,78], PXN[79], PLIN1[80], ERBB2IP[81], LRP1[82], MAGED1[83], PGF[84], ENAH[85], PRKRA[86].

Correlation and biological function analysis of DEPs in the SMIS and ORS group: We analyzed the correlations among DEPs and performed functional enrichment analyses in the SMIS and ORS groups. Figure 6A shows a correlation heatmap of proteins in the endoscopic super minimally invasive surgery and laparoscopic surgery groups. The correlation heatmap includes only DEPs (|log2fold change| > 1, adjusted P < 0.05). The full protein list is provided in Supplementary Table 1.

Figure 6
Figure 6 Differential expression protein analysis of gastric cancer patients in the super minimally invasive surgery group and the organ-resection surgery group. A: Differential expression protein correlation heatmap; B: Gene Ontology term enrichment statistical bar chart; C: Kyoto Encyclopedia of Genes and Genomes path annotation diagram; D: Pathway enrichment dot plot. GO: Gene Ontology; KEGG: Kyoto Encyclopedia of Genes and Genomes.

GO analysis indicated enrichment in immune system processes, cellular processes, metabolic processes, and single-organism processes. In terms of molecular function, binding and catalytic activity were enriched (Figure 6B). KEGG analysis showed significant enrichment in immune system-related pathways (Figure 6C). Pathway enrichment analysis further indicated that differentially expressed postoperative immune-related proteins were mainly enriched in terpenoid backbone biosynthesis, taste transduction, and nitrogen metabolism pathways. Nitrogen metabolism includes the production of nitric oxide (NO), an important immune effector molecule generated by activated macrophages and other leukocytes during inflammation and wound repair, reflecting alterations in immune status (Figure 6D)[87].

DISCUSSION

This study systematically evaluated the comparative changes in trauma-induced immune inflammation in gastric cancer patients undergoing SMIS vs those undergoing ORS. Specifically, it analyzed alterations in trauma immunity before and after surgery, as well as the impact of different surgical methods on organ damage in patients. The results indicated that the SMIS group, before and after surgery, yielded 13 DEPs, while the ORS group revealed 37 DEPs. Notably, a significant increase in the number of DEPs related to organ damage was observed in the ORS group, both preoperatively and postoperatively, compared to the SMIS group. This suggests that ORS has a more pronounced effect on the patients, contributing to greater organ damage.

Clinical data from the 38 enrolled patients, including sex, age, BMI, chronic diseases, history of Helicobacter pylori infection, and preoperative use of anti-inflammatory drugs, were analyzed. No significant differences were observed between the SMIS and ORS groups, indicating comparable baseline inflammatory and immune status between groups, which is important for interpreting the study findings.

We then compared postoperative outcomes between the SMIS and ORS groups and found significant differences in the type and duration of postoperative antibiotic use, postoperative body temperature, and postoperative analgesia. The ORS group had higher postoperative body temperature and a longer duration of antibiotic therapy than the SMIS group. This finding supports the hypothesis that ORS induces disparities in inflammatory and immune-related proteins in the proteome, which are comparatively overexpressed. Statistical analysis also revealed significant differences in hospital stay between the SMIS and ORS groups, further substantiating the notion that ORS results in differential expression of proteins related to cell repair and regeneration. These proteins exhibited a general upward trend, with substantial discrepancies observed across pathological tumor types, influenced by individual conditions, the chosen surgical method, and indications for surgery.

This study also investigated the expression levels and functional characteristics of three proteins. NOS3 is predominantly expressed in endothelial cells and has been identified as a key contributor to NO synthesis, a critical signaling process. NO plays an important role in cardiovascular function, including regulation of vascular tone, endothelial function, cardiac performance, blood coagulation, and thrombosis[32,88]. The ORS preoperative and postoperative groups showed greater upregulation of NOS3, suggesting that ORS generally causes greater damage to the vascular endothelium, with a more significant impact on the circulatory system and vascular endothelial function.

PDGFC is expressed in most organs and cell types[31] and plays a pivotal role in multiple biological, physiological, and pathological processes, including development, angiogenesis, tumor growth, tissue remodeling, wound healing, atherosclerosis, fibrosis, and metabolism. Aberrant PDGFC expression has been linked to several pathological conditions, including choroidal neoplasms, chronic myocarditis, glomerulosclerosis, tissue fibrosis, atherosclerosis, and various cancers. Cancer-associated fibroblasts have been shown to secrete PDGFC, activating PDGFC/PDGFRA signaling in gastric stromal tumor cells and promoting tumor growth and metastasis[26]. Elevated PDGFC levels in gastrointestinal stromal tumors have been associated with increased tumor growth, migration, and invasion. Therefore, avoiding marked postoperative upregulation of PDGFC-related proteins may help mitigate tumor-related risks. In addition, PDGFC overexpression has been shown to enhance the proliferation, migration, and invasion of pancreatic ductal adenocarcinoma cells, suggesting a potential association with tumor recurrence. In the present study, PDGFC was more strongly upregulated in the preoperative and postoperative ORS groups, suggesting that ORS may be associated with greater physiological risk than SMIS; however, further validation is required.

CALCA is a polypeptide hormone that regulates metabolism and plays a role in maintaining bone density and reducing fracture rates. CALCA is also involved in pain regulation and exhibits analgesic effects[23]. In this study, CALCA was significantly upregulated in the preoperative and postoperative ORS groups, suggesting that patients undergoing ORS may experience more pronounced postoperative pain, greater metabolic disturbance, and a longer recovery period. The increase was particularly evident alongside routine use of pain pumps and antipyretic analgesics after ORS, consistent with a higher postoperative analgesic requirement in these patients.

In summary, the increases in CALCA, NOS3, and PDGFC observed with both surgical approaches suggest postoperative inflammation and immune-related responses to these procedures. Implementing preventive measures in clinical settings may help reduce complications related to metabolic disturbance, inflammation, and vascular endothelial injury, thereby facilitating faster recovery and earlier return to normal activities. Although both surgical methods result in the production of DEPs, ORS appears to have a more significant impact on the human body, affecting a broader range of processes, whereas SMIS has a less pronounced effect, with fewer significant changes in the number and function of DEPs.

In comparison with the SMIS group, the ORS group demonstrated a greater capacity to detect proteins associated with cancer cell metastasis. This finding is likely attributable, at least in part, to the more advanced clinicopathological staging of tumors in the ORS group, rather than solely to the surgical approach itself. This underscores the importance of early diagnosis and treatment of digestive tract cancers, as early-stage disease preserves the option for less invasive interventions. Regarding potential confounders, although anesthetics may transiently affect immune responses, they are typically metabolized within 24 hours postoperatively. Given that blood samples were collected on postoperative day 3, residual anesthetic effects are unlikely to have substantially influenced the proteomic results; nonetheless, this possibility cannot be entirely excluded.

However, this study also has limitations. First, patient grouping was determined by clinicians based on tumor pathological characteristics and was not randomized. The SMIS group consisted predominantly of early-stage lesions, whereas the ORS group comprised exclusively invasive adenocarcinomas. We acknowledge that these fundamental differences in disease biology introduce significant selection bias.

Because the extent of surgery is intrinsically linked to tumor progression, the identified DEPs likely represent a composite molecular signature reflecting both the systemic response to surgical trauma and the underlying tumor-burden. Although this limits isolation of the surgical impact alone, it provides a “real-world” snapshot of the molecular alterations associated with different standard-of-care interventions. Future studies employing propensity score matching are needed to further disentangle these factors. Second, although Olink technology offers high sensitivity and microliter-scale detection capability, protein expression levels are determined through relative comparisons. Therefore, new technologies will be needed to enable quantitative analysis of key proteins in the future. Third, this prospective exploratory study is limited by its small sample size (n = 38) and single-center design, which reduces statistical power and precludes subgroup analyses. Thus, these findings represent a preliminary molecular “snapshot” and require validation in large-scale, multicenter prospective trials. Furthermore, our study primarily focused on the acute-phase response and did not investigate long-term proteomic adaptations. Future research should explore how early molecular markers evolve into sustained physiological outcomes.

Despite these limitations, this study provides a preliminary comparison of trauma-associated immune proteins in patients treated with SMIS and ORS. It also highlights the potential adverse effects of organ resection on immune and inflammatory responses, other biological processes, and overall quality of life. Early detection and treatment of gastric cancer are crucial for maintaining viable options for SMIS, thereby minimizing the impact of surgical interventions on patients. However, for locally advanced gastric cancer, ORS remains the prevalent option, as current technological limitations restrict minimally invasive surgery to treating cancers up to stage T1. Consequently, early detection and diagnosis are paramount to ensuring SMIS remains a viable treatment option for patients.

CONCLUSION

Organ-preserving SMIS has been shown to result in fewer DEP species related to trauma and inflammation, as well as fewer upregulated proteins. Conversely, ORS has been observed to yield a greater number of DEP species associated with trauma and inflammation, along with higher expression of these proteins. These findings suggest that ORS exerts a more substantial influence on the body’s responses to trauma and inflammation, as well as on immune function. In light of these observations, implementing targeted preventive measures may be a viable approach to mitigate these effects.

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Footnotes

Peer review: Externally peer reviewed.

Peer-review model: Single blind

Corresponding Author's Membership in Professional Societies: President of the Digestive Disease Branch of the Chinese Medical Doctor Association.

Specialty type: Gastroenterology and hepatology

Country of origin: China

Peer-review report’s classification

Scientific quality: Grade B, Grade B

Novelty: Grade C, Grade C

Creativity or innovation: Grade B, Grade C

Scientific significance: Grade B, Grade C

P-Reviewer: Higaki E, PhD, Japan; McCormack V, PhD, France S-Editor: Wu S L-Editor: A P-Editor: Yu HG