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Research ArticleClinical Studies

The Severity of Anastomotic Leakage May Negatively Impact the Long-term Prognosis of Colorectal Cancer

HIDEKAZU TAKAHASHI, NAOTSUGU HARAGUCHI, JUNICHI NISHIMURA, TAISHI HATA, HIROFUMI YAMAMOTO, CHU MATSUDA, TSUNEKAZU MIZUSHIMA, YUICHIRO DOKI and MASAKI MORI
Anticancer Research January 2018, 38 (1) 533-539;
HIDEKAZU TAKAHASHI
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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  • For correspondence: htakahashi@gesurg.med.osaka-u.ac.jp
NAOTSUGU HARAGUCHI
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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JUNICHI NISHIMURA
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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TAISHI HATA
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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HIROFUMI YAMAMOTO
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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CHU MATSUDA
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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TSUNEKAZU MIZUSHIMA
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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YUICHIRO DOKI
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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MASAKI MORI
Department of Gastroenterological Surgery, Osaka University, Graduate School of Medicine, Suita, Japan
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Abstract

Background: Anastomotic leakage is a major critical complication in colorectal resection. Although its relevance to oncological outcome has been widely investigated, the correlation between the severity of anastomotic leakage and oncological outcome is not well understood. Patients and Methods: The clinical characteristics of 615 patients who underwent curative resection of colorectal cancer with anastomosis and normal healing were compared with 44 similar patients who experienced anastomotic leakage. Results: Of the 44 patients, seven had grade A anastomotic leakage, 21 had grade B and 16 had grade C. Patients with grade A and B anastomotic leakage were treated conservatively (n=28), and those with grade C (n=16) were treated surgically. Those treated surgically had significantly worse recurrence-free survival and worse cancer-specific survival. Conclusion: Anastomotic leakage had a negative prognostic impact on cancer-specific survival that depended on the severity of anastomotic leakage.

  • Colorectal cancer
  • anastomotic leakage
  • oncological outcome

The most current statistics from the World Health Organization show that colorectal cancer (CRC) is one of the most common types of cancer worldwide (1). Although recent developments in surgical techniques used for CRC resection have improved the long-term outcomes of patients, recurrence typically occurs within the first 2 years after primary curative surgery. Despite advances in the operative and non-operative management of recurrent CRC, the majority of patients remain incurable and have a median survival of around 2 years (2-8).

In patients with CRC, the prognostic assessment after surgical resection is based largely on tumour-specific characteristics, such as higher pT stage, pN stage, worse tumour differentiation, and vascular and lymphatic invasion, as well as older patient age. Anastomotic leakage (AL), a major and critical complication of colorectal surgery (9, 10), is also reported to affect long-term patient outcome, since AL is positively correlated with local recurrence. The reported incidence of local recurrence ranges from 0.5% to 30%, depending on the detection method and the type of anastomosis (11, 12).

Different groups have assessed the impact of AL on systemic recurrence and local recurrence of CRC (10, 13-15). AL after curative surgery causes severe systemic inflammation, which correlates with poor long-term outcome in patients with several types of cancers. Recent cell- and animal-based studies support these findings and further show that systemic inflammation leads to micrometastasis due to the high affinity of cancer cells for vascular endothelial cells and to the progression of micrometastases to clinically apparent metastases (16, 17). Moreover, non-steroidal anti-inflammatory drugs suppress initiation and promotion of colon cancer (18-20), supporting a link between inflammation and cancer (16). Taken together, these findings suggest that surgeons should carefully manage patients with AL who have a low level of inflammation.

The International Study Group of Rectal Cancer has defined and graded AL according to its severity (21). However, no long-term data from patients who have undergone curative resection for CRC have been analysed according to the severity of AL. The present retrospective study aimed to evaluate the prognostic impact of the severity of AL after curative resection with anastomosis in patients with CRC.

Patients and Methods

Inclusion criteria. We retrospectively analysed a total of 1481 consecutive patients who underwent colorectal surgery at Osaka University Hospital between January 2001 and June 2012. Patients were excluded if recurrent or metastatic disease was confirmed preoperatively or during surgery, or if they had benign or stage IV tumours or operation without anastomosis, or if their long-term data were unavailable. All recorded clinical and pathological data were re-validated based on medical and pathological records. Data were collected regarding age, sex, body mass index (BMI), primary tumour site, surgical approach, histological grade and TNM stage according to the seventh version of the classification of the Union for International Cancer Control (22). Within 3 weeks before surgery, laboratory blood tests were performed to determine the serum carcinoembryonic antigen (CEA) level. This retrospective study was approved by our Institutional Review Board (approval number 15144).

Anastomotic leakage. In this study, AL was diagnosed when peritonitis caused by leakage, pelvic abscess, or the discharge of faeces, pus or gas from the abdominal drain was observed. AL was defined according to the criteria proposed by the International Study Group of Rectal Cancer (21). Briefly, radiological leakage requiring no active therapeutic interventions was categorized as grade A, AL requiring active therapeutic interventional radiology that was manageable without re-laparotomy was categorized as grade B and that requiring re-laparotomy was categorized as grade C. Grade A and e B AL was termed conservatively treated AL, and grade C AL was categorized as surgically treated AL.

Surveillance. After CRC resection, the surveillance schedule was based on the guidelines of the Japanese Society for Cancer of the Colon and Rectum (23). Briefly, physical examination, serum CEA, chest-X ray and an abdominal computed tomographic (CT) scan were performed at least every 6 months after surgery for 3 years and annually thereafter. Other examinations, such as colonoscopy or chest CT scan, were performed according to patient status.

Diagnosis of recurrence. Diagnosis of recurrence was performed by observation over time using positron-emission tomography-CT, magnetic resonance imaging, or histological examination. Definitive diagnosis of recurrence in this study was confirmed retrospectively.

Statistical analysis. The outcome measures were recurrence-free survival, which was measured as the duration from surgery to any recurrence, and cancer-specific survival, which was measured as the duration from surgery to all-cause cancer-specific death. The Kaplan–Meier method and the log-rank test were used for survival analysis. Univariate analyses of recurrence-free survival and cancer-specific survival were conducted using the Cox proportional hazards model to identify potential prognostic factors of survival; variables that gave p-values of less than 0.05 in univariate analysis were included in a Cox multivariate regression model to investigate independent predictors of recurrence-free and cancer-specific survival in CRC; a p-value of less than 0.05 was considered to indicate statistical significance. All statistical analyses were performed using JMP Pro Version 12 (SAS Institute, Inc., Cary, NC, USA).

Results

Patient characteristics. A total of 1,481 patients underwent colorectal resection from January 2001 to June 2012 at our Institute. Of these, 285 patients did not have primary anastomosis, 228 patients did not have CRC, 136 patients had stage IV CRC, three patients died in the hospital (two due to systemic inflammatory response syndrome followed by AL and one patient due to pneumonia) and 47 patients changed hospitals for further surveillance. Thus, a total of 659 patients with CRC who underwent curative resection with anastomosis were enrolled in this study (Figure 1). The incidence of AL was 6.7% (44/659). Seven patients were categorised as having AL of grade A, 21 with grade B, and 16 with grade C. Of the cases with grade C AL, two died in-hospital. The median follow-up for survivors was 64.6 months (interquartile range=48.7-86.9 months). During the follow-up period, 70/659 patients (10.6%) patients died, and 48 deaths (68.6%) were cancer-specific. Cancer recurrence was observed in 103/659 patients (15.6%). Patient clinical and pathological data are shown in Table I.

Figure 1.
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Figure 1.

Flowchart of patients included in the study.

Prognostic value of AL in disease-free and disease-specific survival. Since the number of patients with grade A AL was too small to analyse, grade A and grade B AL cases were categorized as conservatively treated AL (n=28), while grade C was categorized as surgically treated AL (n=16). Thirty-seven patients in the group with no leakage, two in the conservatively treated group, and five in the surgically treated group died from primary cancer. Recurrence was observed in 90, five and five patients, respectively.

To address the impact of AL on disease-specific long-term outcome, Kaplan–Meier analysis was performed to assess the effect of AL on disease-free survival and disease-specific survival. The disease-free survival rate was significantly different in the no-leakage, and conservatively treated AL groups versus the surgically treated AL group (p<0.05, Figure 2). Univariate analysis showed that disease-free survival was significantly worse in the surgically treated AL group than in the no-leakage group (p<0.05); however, no significant differences were found in the other pairwise group comparisons (Figure 2). Local recurrence was observed in a total of 10 patients, including eight patients in the no-leakage group, one in the conservatively treated group and one in the surgically-treated group. The disease-specific survival rate of the no-leakage conservatively-treated AL group was significantly better than that of the surgically-treated AL group (p<0.001, Figure 3). There was no difference in disease-specific survival between the conservatively treated AL group and the no-leakage group (p=0.70), but disease-specific survival of the surgically treated leakage group was significantly worse than that of the no-leakage group (p<0.001), and that of the conservatively treated AL group (p<0.05).

Figure 2.
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Figure 2.

Kaplan–Meier curves for disease-free survival according to anastomotic leakage category. Disease-free survival was significantly worse in the surgically-treated AL group than in the no-leakage group (p<0.05).

Cox proportional hazards model for disease-specific survival. A Cox proportional hazards model was used to support the data from the Kaplan–Meier analysis regarding disease-specific survival. Cox regression analysis, which included age, sex, tumour site, tumour grade, T-stage, N-stage and AL treatment strategy showed that tumour grade (p<0.05), T-stage (p<0.0001), N-stage (p<0.0001) and AL (p<0.05) each had an independent effect on disease-specific survival (p<0.001, Table II). In the multivariate model, N-stage (p<0001) and AL (p<0.05) each had a negative impact on disease-specific survival (Table II).

Figure 3.
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Figure 3.

Kaplan–Meier curves for disease-specific survival according to anastomotic leakage (AL) category. Disease-specific survival rate of the no-leakage conservatively-treated AL group was significantly better than that of the surgically-treated AL group (p<0.001). Disease-specific survival of the surgically-treated AL group was significantly worse than that of no-leakage group (p<0.001), and that of the conservatively-treated AL group (p<0.05).

Assessment of the severity of AL. To assess the severity of AL in each group, peak white blood cell (WBC) counts and the C-reactive protein (CRP) level after surgery were analysed in each group as subjective indicators. The peak WBC count and the peak CRP value after surgery were both significantly higher than for patients with conservatively treated AL (Table III, patients with grade A or grade B AL, p<0.05). These results suggest that patients categorized with grade C AL had more severe inflammation than those with grade A AL.

Discussion

The present study demonstrated that patients with AL that had unavoidable reoperations had poorer overall survival than patients with AL that was treated conservatively. In other words, the severity of the AL might be associated with the long-term outcomes of patients with CRC.

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Table I.

The characteristics of patients with and without anastomotic leakage after colorectal resection.

Although AL is a highly-feared early complication after surgical treatment of CRC that is associated with high morbidity and mortality, the impact of AL on longer-term oncological outcomes such as local recurrence, distant recurrence and survival remains a matter of debate. Recurrence after AL is most commonly local, and several groups have reported increased local tumour recurrence after AL in patients who underwent resection for CRC, as summarised in the meta-analysis by Mirnezami et al. (12), which focused on studies conducted before 2009, and that by Lu et al. (11), which focused on studies conducted after 2003. Both concluded that AL after curative resection for CRC has an adverse impact on cancer-specific local recurrence and thus survival. Although these findings have been substantiated by additional studies (14, 15, 25-27), other groups have reported contradictory findings (10, 13, 28, 29). For example, Eriksen et al. found no significant increase in recurrence after AL in a study of 1958 patients from the Norwegian Rectal Cancer Registry (29). There were some differences in these previous reports in terms of, for example, the historical background, the number of cases and the AL rates, suggesting that the short- and long-term outcomes of AL that accompanies curative surgery for CRC might vary in the different reports. In the present study, although the local recurrence rate of the AL patients was significantly higher than that of the no-leakage patients [5.4% (2/37) versus 1.2% (10/782); p<0.05, Pearson's test], the event number was too small for further subgroup analysis.

In terms of the long-term cancer-specific survival of patients of AL with CRC, it is possible that the inflammatory response associated with AL could itself facilitate cancer recurrence. During the acute and subsequent chronic inflammation that accompanies AL, a variety of acute-phase reactants and pro-inflammatory mediators are released both locally and systemically. After a local inflammatory reaction, local site recurrence may emerge (30). For systemic reactions, an increasing number of experimental studies in recent years have demonstrated that many inflammatory biomarkers are implicated in tumour cell proliferation, survival, avoidance of apoptosis, progression to metastasis and resistance to drug therapy. For example, interleukin-1 (IL1) can enhance the growth and progression of CRC (31, 32). Notably, IL1 is highly expressed in advanced cases, and IL1 antagonists inhibited tumour growth in experimental models. It is therefore conceivable that high IL1 levels, either systemically or locally, may sustain exfoliated cancer cells, providing the survival and growth signals needed to promote recurrence at a later date. Nojiri et al. suppressed tumour metastasis by targeting guanylyl cyclase-A (GC-A), an inflammation-related target of nuclear factor kappa-B (NF-κB), using atrial natriuretic peptide (17). More recently, endothelial death receptor 6, a well known NF-κB target, was found to act as the primary mediator of cancer cell extravasation and metastasis in vivo and in vitro (33).

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Table II.

Clinical, histopathological characteristics and Cox proportional hazards models predicting cancer-specific survival for patients who underwent curative colorectal resection with anastomosis.

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Table III.

Peak levels of inflammatory indicators in each group (mean±SD).

The notion that an inflammatory response may promote CRC recurrence is further supported by data from other cancer types. In breast cancer, several authors have suggested that inflammation plays a role in disease recurrence (34-36). Murthy et al. noted a significant relationship between infective wound complications after primary breast cancer resection and subsequent tumour recurrence (34). Pierce et al. studied the relationship between markers of inflammation and overall and disease-free survival from breast cancer. In their study of 659 patients, elevated markers of inflammation were significantly associated with reduced overall and disease-free survival (35). Saito et al. studied 305 patients who underwent curative surgery for pT2-T4b gastric cancer and found that CRP elevation is a more reliable indicator of survival after gastric cancer surgery than the occurrence of postoperative complication (36). According to this hypothesis, systemic recurrence, as well as local recurrence, would be expected to be higher in patients with AL after curative surgery for CRC.

With regard to re-operation requiring general anaesthesia, one study report that anaesthetics themselves may cause immune suppression (37). By modulating the neurohumoral stress response, anaesthetics and analgesics can also independently suppress immune function (37). Surgical trauma accompanied by adrenergic activation can directly potentiate cancer cell growth (38). According to this evidence, re-operation requiring general anaesthesia might have an undesirable effect on micrometastasis.

This study had a number of limitations. Firstly, the retrospective study design may have led to selection bias. Secondly, the use of data from a single institution may limit the wider applicability of our findings. Thirdly, this assessment was performed on a small sample of patients. Finally, we did not address recent development of technologies and peripheral equipment for interventional radiology, which have rapidly changed the management of patients suffering from AL (39).

Conclusion

Our data demonstrate that the severity of AL was associated with poor long-term outcomes in patients who underwent curative surgery for CRC. Although further prospective studies are needed to clarify the effects of AL in patients with CRC, this finding has implications for the management of AL after CRC resection.

Footnotes

  • Conflicts of Interest

    The Authors declare that they have no conflicts of interest in regard to this study.

  • Received October 24, 2017.
  • Revision received November 9, 2017.
  • Accepted November 13, 2017.
  • Copyright© 2018, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 38 (1)
Anticancer Research
Vol. 38, Issue 1
January 2018
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The Severity of Anastomotic Leakage May Negatively Impact the Long-term Prognosis of Colorectal Cancer
HIDEKAZU TAKAHASHI, NAOTSUGU HARAGUCHI, JUNICHI NISHIMURA, TAISHI HATA, HIROFUMI YAMAMOTO, CHU MATSUDA, TSUNEKAZU MIZUSHIMA, YUICHIRO DOKI, MASAKI MORI
Anticancer Research Jan 2018, 38 (1) 533-539;

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The Severity of Anastomotic Leakage May Negatively Impact the Long-term Prognosis of Colorectal Cancer
HIDEKAZU TAKAHASHI, NAOTSUGU HARAGUCHI, JUNICHI NISHIMURA, TAISHI HATA, HIROFUMI YAMAMOTO, CHU MATSUDA, TSUNEKAZU MIZUSHIMA, YUICHIRO DOKI, MASAKI MORI
Anticancer Research Jan 2018, 38 (1) 533-539;
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Keywords

  • colorectal cancer
  • anastomotic leakage
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