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ORIGINAL RESEARCH article

Front. Surg., 06 January 2023
Sec. Surgical Oncology
This article is part of the Research Topic Digital Revolution in Oncology: How Digital Tools Transform the Evaluation and Management of Cancer Patients View all 24 articles

A nomogram to predict the risk of colorectal anastomotic leakage combining inflammatory-nutritional and abdominal aorta calcium index

\r\nZhaoxiong Zhang,&#x;Zhaoxiong Zhang1,†Weilin Sun,&#x;Weilin Sun1,†Jun Wang,Jun Wang1,2Yuanlin DengYuanlin Deng3Yongjia YanYongjia Yan1Dong LiDong Li3Weihua Fu
\r\nWeihua Fu1*
  • 1Department of General Surgery, Tianjin Medical University General Hospital, Tianjin, China
  • 2Department of Gastrointestinal Surgery, The People's Hospital of Qiannan, Duyun, China
  • 3Department of Radiology, Tianjin Medical University General Hospital, Tianjin, China

Background: Anastomotic leakage is a serious complication after colorectal cancer surgery, which affects the quality of life and the prognosis. This study aims to create a novel nomogram to predict the risk of anastomotic leakage for patients with colorectal cancer based on the preoperative inflammatory-nutritional index and abdominal aorta calcium index.

Methods: 292 patients at Tianjin Medical University General Hospital (Tianjin, China) from January 2018 to October 2021 who underwent colorectal cancer surgery with a primary anastomosis were retrospectively reviewed. A nomogram was constructed based on the results of multivariate logistic regression model. The calibration curves and receiver operating characteristic curves were used to verify the efficacy of the nomogram.

Results: Univariate and multivariate analyses showed that tumor location (P = 0.002), preoperative albumin (P = 0.006), preoperative lymphocyte (P = 0.035), preoperative neutrophil to lymphocyte ratio (P = 0.024), and superior mesenteric artery calcium volumes score (P = 0.004) were identified as the independent risk factors for postoperative anastomotic leakage in patients with colorectal carcinoma. A nomogram was constructed based on the results of the multivariate analysis, and the C-index of the calibration curves was 0.913 (95%CI: 0.870–0.957) in the training cohort and 0.840 (95%CI: 0.753–0.927) in the validation cohort.

Conclusion: The nomogram, combining basic variables, inflammatory-nutritional index and abdominal aorta calcium index, could effectively predict the possibility of postoperative anastomotic leakage for patients with colorectal cancer, which could guide surgeons to carry out the appropriate treatment for the prevention of anastomotic leakage.

Introduction

With the progress of surgical technology and oncology surgery, surgical treatment has become the principal treatment for the patients with resectable colorectal cancer, which greatly improves their survival prognosis (1, 2). However, postoperative complications, which affect the recovery of patients after surgery, and even threaten the survival of patients, have always been an urgent problem that plagues surgeons. Among postoperative complications, anastomotic leakage (AL) is one of the most common and serious postoperative complications, with an incidence of 4%–29% (3) AL not only prolongs the patient's hospital stay, reduces the patient's quality of life, but even affects the patient's survival after surgery (46). Surgeons have made much effort to avoid AL in clinical practice, such as prophylactic ileostomy, and intraoperative evaluation of blood flow with indocyanine green (79) However, there is still no objective method for helping surgeons to predict the occurrence of AL in patients with colorectal cancer before surgery.

At present, while the recognized factors related to AL after colorectal cancer surgery were not clear, we could confirm that AL is the result of multiple factors (10, 11). Some studies showed that the tumor located in the rectum, preoperative malnutrition, excessive inflammatory response and other factors could be related to postoperative AL (10, 1214). Patients with gastrointestinal cancer usually had a higher risk of preoperative malnutrition, which might be associated with poor postoperative outcomes (14, 15). Several studies showed that adequate nutritional support might improve this situation for patients with high nutritional risk (16). The nutritional status of the patients seemed to be an important factor for clinicians to predict the early prognosis. In recent years, numerous studies confirmed that cancer-associated inflammation was an important factor to produce tumor-promoting effects (17). Preoperative systemic inflammation of colorectal cancer patients was an important factor associated with the poor prognosis and high morbidity of AL (10, 18). The results of hematological tests were great indicators of preoperative systemic inflammation in patients with colorectal cancer, and the relevant data was readily available in almost all patients. Moreover, abdominal aorta calcification, which could damage the vascular function and might reduce anastomotic blood flow, might increase the risk of colorectal AL (19, 20). Therefore, accurate preoperative assessment of the above risk factors was essential to prevent AL.

This study aimed to establish a model that could predict the probability of postoperative AL by assessing the preoperative status of patients with colorectal cancer. In this study, the index of nutrition, the index of inflammation and the artery calcium volumes score were considered as the risk factors for AL, and a better nomogram was prepared to guide clinicians in decision-making.

Patients and methods

Patients

Between January 2018 and October 2021, a total of 327 patients underwent colorectal cancer resection at Tianjin Medical University General Hospital. The clinicopathologic data of these patients were retrospectively reviewed from the hospital information system after receiving Institutional Review Board approval. The data included basic variables (gender, age, alcohol, smoke, diabetes, BMI, tumor location, Obstruction, ASA score and pTNM stage), preoperative nutritional variables (hemoglobin, albumin, and prognostic nutritional index), inflammatory variables (WBC, neutrophil, lymphocyte, platelet, neutrophil-lymphocyte ratio; and platelet-lymphocyte ratio), and vascular condition variables (superior mesenteric artery calcium volumes score, inferior mesenteric artery calcium volumes score, and abdominal aorta calcium volumes score). Eligibility criteria included: (I) proven histologically primary colorectal carcinoma; (II) R0 colorectal cancer surgery with D3 lymph node dissection and a primary anastomosis; (III) complete and available clinicopathological data. The exclusion criteria were: (I) less than 18 years old; (II) history of neoadjuvant chemotherapy or radiotherapy; (III) the patients who had surgery for other cancers or bowel resection for any reason.

The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Surgical procedure

All patients underwent open or laparoscopic radical surgery for colorectal cancer. The linear stapler device was applied in the intestinal anastomosis of colon cancer patients, and the circular stapler device was applied in the anastomosis of rectal cancer patients. Then we performed the seromuscular suturing with a 3–0 absorbable suture to reduce the intestinal tension and ensure the mechanical integrity of the anastomosis for colon cancer surgery. And the air-leak test was used to confirm mechanical integrity after intestinal anastomosis in rectal cancer surgery.

Evaluation of Al

AL was diagnosed by the presence of gas or intestinal contents drained from the wound or drainage tube, the evidence of the intraperitoneal infection, or the positive signs of CT or endoscopy. Digital rectal examination was also used to identify AL in patients with rectal cancer.

Preoperative variables and vascular evaluation

We recorded the results of the preoperative laboratory examination 7 days before the operation. The pathological TNM staging was assessed according to the 8th editions of the American Joint Committee on Cancer (AJCC) staging system. Prognostic nutritional index (PNI) values were calculated with the formula: 10 × albumin (g/L) + 0.005 × total lymphocyte count. Neutrophil-lymphocyte ratio (NLR) value was calculated as neutrophils count divided by absolute lymphocyte count. Platelet-lymphocyte ratio (PLR) value was calculated as platelet count divided by absolute lymphocyte count. The vascular condition was evaluated through a preoperative multi-detector computed tomography (MDCT) image. The MDCT images of aortic between the origin of the superior mesenteric artery (SMA) and inferior mesenteric artery (IMA) were analyzed on the software (Syngo Calcium Scoring, Siemens). The plaque area in the aortic lumen, which was more hyperdense than the vascular lumen and adjacent parenchyma (density more than 130 HU), was considered as vascular calcification (21). The artery calcium volume score was measured by calculating the plaque area multiplied by the slice spacing. The SMA and IMA calcium volume score was determined by calcium volume scores at the origin of SMA and IMA on the aorta, respectively. In this study, the abdominal aorta calcium volume score was calculated as the total score of SMA and IMA calcium volume (Figure 1).

FIGURE 1
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Figure 1. The MDCT images of abdominal aorta, SMA and IMA calcification. The arrow in the images indicates the site of arterial calcification. The plaque was outlined, and then its area was obtained by the software (Syngo Calcium Scoring, Siemens). (A) The calcification at the origin of SMA on the aorta. (B) The calcification of the abdominal aorta.

Patients were divided into a low or high group according to the cut-off value of albumin, WBC, neutrophil, lymphocyte, platelet, NLR, PLR, PNI, SMA calcium volume score, IMA calcium volume score and abdominal aorta calcium volume score, which was calculated through receiver operating characteristic (ROC) curve analysis.

Nomogram model

First, the univariate and multivariate analyses were performed to identify the independent risk factors for AL after colorectal cancer surgery. Then, the nomogram was created based on the results of the multivariate logistic regression analysis. The nomogram was subjected to 1,000 bootstrap resamples to calculate the concordance index (c-index) which could be used to estimate the predictive accuracy of the model (22). And the calibration curves were created to graphically present the relationship between the observed results and the predicted probabilities.

Statistical analysis

The χ2 or Fisher's exact test was used for categorical variables, and the t-test was used for continuous variables. Factors that showed significant differences in the univariate analysis (P < 0.05) were included in the multivariate analysis. Multivariate analysis was performed using a logistic regression model for the evaluation of the predictive risk factors, in which, the odds ratios (ORs) and 95% confidence interval (CI) were calculated. In all the other statistical analyses, significance was defined as P < 0.05 (two-sided). ROC analysis was performed to compare the accuracy of the nomogram and five independent risk factors and area under the curve (AUC) were also calculated. All statistical analyses were performed using the statistical analysis program package IBM SPSS Statistics (Version 24.0; IBM Corp., New York, USA, RRID: SCR_019096). And R 4.0.1 software (RMS, riskRegression and pROC packages; Institute for Statistics and Mathematics, Vienna, Austria; http://www.r-project.org/, RRID: SCR_001905).

Results

Clinical characteristics of patients

According to the above eligibility and exclusion criteria, 292 patients in total were included in this study. These patients were classified into training cohort (date of surgery: 2018–2019, n = 177) and validation cohort (date of surgery: 2020–2021, n = 115) according to the date of surgery (Figure 2). The clinical and pathologic characteristics of 292 patients in this retrospective study were listed in Table 1. These patients included 168 males and 124 females. The median age was 67 (range 26–90). A total of 87 (29.79%) patients had a history of alcohol, and 94 (32.19%) had a history of smoking. 66 (22.60%) patients were diagnosed of diabetes. The median BMI was 23.73 (range 14.61–34.19). Tumors were distributed on right colon (n = 121, 41.44%), transverse colon (n = 12, 4.11%), left colon (n = 25, 8.56%), sigmoid colon (n = 58, 19.86%) and rectum (n = 76, 26.03%). A total of 37 (12.67%) patients had AL, and the number of patients with AL was 6 in the right-sided colon, 3 in the transverse colon, 3 in the left-sided colon, 9 in the sigmoid colon and 16 in the rectum. 49 (16.78%) patients had preoperative obstruction and the ASA score of 135 (46.23%) patients is 3. The pT stage of tumor for most patients was pT4a (203, 69.52%), and most patients had no lymph node metastasis (N0: 178, 60.96%). The results of hematological tests were presented in the form of the median (range) and mean (SD). Then, the Clinical characteristics between the training and validation cohort were estimated and no significant differences were shown, which was presented in Table 2.

FIGURE 2
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Figure 2. The flow chart of the selection process for the colorectal cancer patients from from January 2018 to October 2021.

TABLE 1
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Table 1. Clinicopathologic characteristics of all patients.

TABLE 2
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Table 2. Comparison of patients in the training and validation cohorts.

We chose the cutoff value of the albumin, WBC, neutrophil, lymphocyte, platelet, NLR, PLR, PNI, SMA calcium volumes score, IMA calcium volumes score and abdominal aorta calcium volumes score to divide the patients into low and high groups, according to ROC curves.

Correlation analysis of risk factors for postoperative Al

We investigated the potential risk factors for AL by univariate analysis in the training cohort (Table 3). The univariate analysis showed the tumor located in the sigmoid colon and rectum (P = 0.007), low preoperative albumin (P = 0.011), high preoperative lymphocyte (P = 0.021), high preoperative NLR (P = 0.016), high SMA calcium volumes score (P = 0.001), high IMA calcium volumes score (P = 0.001) and high abdominal aorta calcium volumes score (P = 0.001) were significantly correlated with the occurrence of postoperative AL. Then, these significant variables were performed in the forward step procedures by the multivariate logistics regression model. We observed tumor location (transverse colon, OR: 2.891, 95% CI: 0.194–43.017, P = 0.441; left colon, OR: 10.417, 95% CI: 0.668–162.511, P = 0.095; sigmoid colon, OR: 12.162, 95% CI: 2.213–66.836, P = 0.004; rectum, OR: 13.568, 95% CI: 2.590–71.082, P = 0.002), preoperative albumin (OR: 0.157, 95% CI: 0.042–0.593, P = 0.006), preoperative lymphocyte (OR: 10.623, 95% CI: 1.175–96.071, P = 0.035), preoperative NLR (OR:13.004, 95% CI: 1.406–120.226, P = 0.024), SMA calcium volumes score (OR: 6.810, 95% CI: 1.870–24.801, P = 0.004) were identified as the independent risk factors for postoperative AL in patients with colorectal carcinoma (Figure 3).

FIGURE 3
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Figure 3. Forest plot about multivariate logistic regression analysis of clinicopathologic characteristics in the training cohort for anastomotic leakage.

TABLE 3
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Table 3. Univariate analysis of risk factors for anastomotic leakage in training cohort.

Creation and confirmation of the nomogram

Based on the above results of univariate and multivariate analysis, we chose the tumor location, preoperative albumin, preoperative lymphocyte, preoperative NLR, and SMA calcium volumes score as factors to create a nomogram for predicting postoperative AL in patients with colorectal carcinoma. The occurrence probability of postoperative AL can be predicted by calculating the points of each variate and projecting the total points to the bottom scale (Figure 4).

FIGURE 4
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Figure 4. The nomogram predicting postoperative AL in patients with colorectal adenocarcinoma. Match the characteristics of patients to the scale of each risk factor in the nomogram to get the corresponding points. All points were added up to obtain the total points, and then total points was matched to the scale of anastomotic fistula rate to obtain the probability of AL. NLR, neutrophil-lymphocyte ratio.

Then, in order to evaluate the predictive ability of the nomogram model, we performed 1,000 resampling bootstrap analyses in both the training cohort and validation cohort. And the calibration curves were illustrated to verify the relationship between the predicted risk and observed frequency (Figure 5). The C-index of the training cohort and validation cohort was 0.913 (95%CI: 0.870–0.957), and 0.840 (95%CI: 0.753–0.927), respectively. And the brier score was 0.077 (95%CI: 0.051–0.103), and 0.106 (95%CI: 0.066–0.146) respectively. These results demonstrated the nomogram model had a good accuracy in predicting postoperative AL in patients with colorectal carcinoma.

FIGURE 5
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Figure 5. The calibration curves of the nomogram in the training cohort (A) and validation cohort (B). The X-axis represented the possibility of AL predicted by the nomogram, and the Y-axis represented the possibility of AL observed in patients.

Receiver operating characteristic analysis

We then used ROC analysis to compare the accuracy of the nomogram and five independent risk factors. The AUC for postoperative AL in training cohort and validation cohort were calculated: the nomogram, 0.913 (95%CI: 0.869–0.957) and 0.840 (95%CI: 0.751–0.929); tumor location, 0.711 (95%CI: 0.607–0.815) and 0.573 (95%CI: 0.449–0.698); preoperative lymphocyte, 0.617 (95%CI: 0.559–0.676) and 0.598 (95%CI: 0.448–0.708); preoperative NLR, 0.624 (95%CI: 0.565–0.682) and 0.611 (95%CI: 0.570–0.652); preoperative albumin, 0.647 (95%CI: 0.546–0.748) and 0.644 (95%CI: 0.533–0.754); SMA calcium volumes score, 0.694 (95%CI: 0.588–0.799) and 0.692 (95%CI: 0.566–0.818), respectively (Figure 6).

FIGURE 6
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Figure 6. Receiver operating characteristic (ROC) curves of the nomogram and five risk factors in training cohort (A) and validation cohort (B). The values of AUC (95%CI) for the nomogram and five risk factors were listed in the figure. The X-axis represented the specificity of the nomogram and five risk factors to predict AL, and the Y-axis represented the sensitivity of these items. NLR, neutrophil-lymphocyte ratio; SMA, superior mesenteric artery; AUC, area under the curve.

Discussion

AL is a serious complication that can affect the short-term quality of life and long-term prognosis after colorectal cancer surgery (5). Surgeons usually judge whether the anastomotic bowel is ischemic by observing the color of the bowel in surgery, but this method is too subjective. Recent studies showed that intraoperative application of indocyanine green, selective ileostomy and other methods could also reduce the morbidity of postoperative AL (7, 9, 23). However, these methods were easily biased by some factors and new evaluation methods were needed. Preoperative malnutrition, serious inflammatory response and abdominal artery calcification might have an adverse effect on postoperative tissue healing (10, 12, 19, 20), and these risk factors were included in this study to construct the nomogram.

The baseline data of 292 patients were retrospectively collected in this study and multivariate analysis showed that tumor location, preoperative albumin, preoperative lymphocyte, preoperative NLR, and SMA calcium volumes score were the risk factors for AL after colorectal cancer surgery. It was worth noting that BMI, brinkman index and sake index were not significantly correlated with the occurrence of AL, which may be attributed to the small sample size and single-center study. Many studies showed that the morbidity of AL was the greatest in the patients after low anterior resection for rectal cancer (12, 24). The patients had higher morbidity of AL when the tumor was closer to the anal margin. This study demonstrated that tumor location was the strongest risk factor for colorectal cancer surgery, and surgeons should pay special attention to the prevention of AL in these patients. The preoperative nutrition of the patients could affect the occurrence of postoperative complications. A multicenter prospective study of 3,193 patients conducted by Matteo et al. showed that low preoperative albumin was an independent risk factor for AL after colon resection for cancer (25). The low albumin usually represented severe malnutrition in cancer patients, and the patients were generally in poor condition with serious symptoms and more malignant tumors. Adequate preoperative nutritional support for such patients was necessary to improve postoperative recovery. The preoperative systemic inflammatory response was significantly associated with postoperative AL, but the mechanism of inflammation in AL was still unclear (10). The preoperative NLR was a better indicator to reflect the basic level of the inflammatory response (18, 26). The preoperative NLR was associated with the occurrence of major postoperative surgical complications (27), and one study showed that the high perioperative lymphocyte and NLR were related to the occurrence of AL in patients with colorectal cancer surgery (28). Another study showed that preoperative NLR was an independent risk factor for postoperative AL of rectal cancer, but its specificity was not high (29). This study concluded that high preoperative lymphocytes and NLR may lead to AL, which might be due to the local continuous infiltration of numerous inflammatory cells, which inhibited angiogenesis and fibroblast growth (17).

The abdominal aorta and its branches are important blood vessels that surgeons should pay special attention to protecting. Some studies have shown that some factors related to vascular abnormalities can affect the outcome of gastrointestinal surgery. The calcification of the thoracic aorta, celiac axis and SMA increased the risk of AL after esophageal cancer surgery (30, 31). One meta-analysis showed that calcification of the abdominal aorta might increase the risk of colorectal AL (19). Some prospective studies that explored the correlation between arterial calcification and AL in patients after colorectal cancer surgery were needed. The results of multivariate analysis in this study showed that a high SMA calcification score was an independent risk factor for AL after colorectal cancer surgery. The occurrence of AL was affected by blood perfusion at the anastomotic site. The blood supply of the proximal bowel always comes from direct or compensatory perfusion of SMA after colorectal cancer surgery. SMA with high calcification score has less blood flow, which may reduce the amount of blood circulation in the intestine and prolong the time of compensatory blood supply. Eventually, intestinal healing may be delayed due to insufficient nutrient supply, and the risk of AL will increase.

In this paper, a nomogram based on the multivariate analysis model was constructed to accurately predict the morbidity of AL after colorectal cancer surgery. The nomogram showed that tumor location and preoperative NLR were the two important risk factors for AL. The AL was most likely to occur in the rectum, sigmoid colon and left-side colon, and surgeons should carefully evaluate these patients' conditions during the perioperative period. The high-level NLR and lymphocyte indicated that the patients had unsuited inflammatory response which might inhibit the tissue growth at the anastomotic site. Many studies showed that some perioperative treatments like NSAIDs did not achieve the purpose of preventing AL (32, 33). Preoperative low albumin and severe SMA calcification could exacerbate nutrient deficiency at the anastomotic site. The severe SMA calcification was also the main risk factor and got approximately 74 points in the nomogram, which suggested that adequate blood supply was necessary for anastomotic healing. Preoperative treatment may be necessary for patients with obvious SMA calcification. The calibration curves in both the training cohort and validation cohort proved the consistency between the predicted value and the actual observation value. The ROC curve of the nomogram had the largest AUC, and the predictive accuracy of the nomogram was better than that of other risk factors. This nomogram can be used clinically to accurately predict the possibility of postoperative AL in patients with colorectal cancer.

Some limitations still existed in this study. This study was a single-center retrospective study, and more samples were needed to be included to obtain high-level evidence. The nomogram in this study showed excellent performance in internal verification, but it still needed to be further tested with more samples.

In conclusion, the occurrence of AL was affected by multiple factors, and a comprehensive evaluation of patients would be necessary. The tumor location closes the anal margin, malnutrition, excessive inflammatory response and severe SMA calcification could increase the risk of AL in patients after colorectal cancer surgery. The nomogram, combining the above risk factors, could effectively predict the probability of postoperative AL in patients with colorectal carcinoma, which can guide surgeons to carry out the appropriate treatment for the prevention of AL.

Data availability statement

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Ethics statement

The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by the Ethics Committee of Tianjin Medical University General Hospital (NO.: IRB2021-WZ-179) and individual consent for this retrospective analysis was waived.

Author contributions

ZZ, WS, and WF contributed to conception and design of the study. JW, YD, and DL organized the database. ZZ and WS performed the statistical analysis. ZZ wrote the first draft of the manuscript. WS, YY and WF wrote sections of the manuscript. All authors contributed to the article and approved the submitted version.

Funding

This study was funded by Tianjin Key Medical Discipline (Specialty) Construction Project (TJSYXZDXK015) and the Health Science and Technology Project of Tianjin Health Commission [ZC20190].

Acknowledgments

The authors would like to thank Tianjin Medical University General Hospital, Tianjin Key Medical Discipline (Specialty) Construction Project and Health Science and Technology Project of Tianjin Health Commission for support.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: arterial calcification, anastomotic fistula, colorectal cancer, inflammation, nutrition

Citation: Zhang Z, Sun W, Wang J, Deng Y, Yan Y, Li D and Fu W (2023) A nomogram to predict the risk of colorectal anastomotic leakage combining inflammatory-nutritional and abdominal aorta calcium index. Front. Surg. 9:1008448. doi: 10.3389/fsurg.2022.1008448

Received: 31 July 2022; Accepted: 24 October 2022;
Published: 6 January 2023.

Edited by:

Kee Yuan Ngiam, National University Health System (Singapore), Singapore

Reviewed by:

Shuai Xiao, University of South China, China
Marius Kryzauskas, Vilnius University, Lithuania

© 2023 Zhang, Sun, Wang, Deng, Yan, Li and Fu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Weihua Fu dGptdWdoZ3NfZndoQDE2My5jb20=

These authors have contributed equally to this work and share first authorship

Specialty Section: This article was submitted to Surgical Oncology, a section of the journal Frontiers in Surgery

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