JOP. J Pancreas (Online) 2010 May 5; 11(3):226-229.

 

 

Impact of Pancreatic Leaks on Survival Following Pancreaticoduodenectomy

 

 

Fabio Ausania, Natalie Cook, Neville Jamieson, Emanuel Huguet, Asif Jah, Raaj Praseedom

 

 

Hepato-Pancreato-Biliary Surgery, Addenbrooke's Hospital, NIHR Comprehensive Biomedical Research Centre. Cambridge, United Kingdom

 

 

ABSTRACT

Context Pancreatic leak following pancreaticoduodenectomy has a major impact on postoperative mortality. However, it is not clear whether pancreatic leaks affect long term survival in patients with pancreatic ductal adenocarcinoma. Objective The aim of this study is to compare the long term outcome in patients who underwent pancreaticoduodenectomy, with and without postoperative pancreatic leak. Patients All 133 patients who underwent a pancreaticoduodenectomy at the HepatoPancreatoBiliary Unit, Addenbrooke’s Hospital, Cambridge, between June 2002 and June 2007 were identified from a prospectively held database. The study was restricted to 47 patients who had a confirmed diagnosis of pancreatic ductal adenocarcinoma. Setting Pancreatic leak was defined as drain fluid amylase more than three times the serum level for more than 3 days post operatively. Main outcome measure Long term survival of patients with and without leaks were compared using Kaplan-Meier curves and significance was measured using the log-rank test. Results Median follow-up was 30.8 months. The median actuarial survival of all ductal adenocarcinoma patients was 19 months. Pancreatic leaks occurred in 9 patients (19.1%). There were no significant differences in the overall survival or presence of recurrence between the two groups. Conclusions Pancreatic leak following pancreaticoduodenectomy does not appear to impact on long-term outcome of patients with pancreatic ductal adenocarcinoma.

 

INTRODUCTION

Pancreatic ductal adenocarcinoma is an aggressive cancer and surgical resection remains the only potentially curative option. Even in specialist centres, only 15% of patients diagnosed with pancreatic cancer are found suitable for surgical resection as the majority of these patients present with advanced disease [1]. Despite improvements in post operative care and the routine use of adjuvant chemotherapy [2], prognosis remains poor with a median survival of 13.3 months and 5-year survival of 10.5% [3]. Extended resections have not been shown to improve survival in randomised trials [4].

Pancreatic leaks following pancreaticoduodenectomy are a major cause of post operative morbidity and mortality [5]. The variations in the method of pancreatic stump management and the volume of literature on the subject indicate the ongoing efforts to prevent this complication. Anastomotic leak has been reported as an adverse prognostic factor affecting the long term survival of colorectal cancer patients [6, 7, 8, 9]. Studies have not convincingly demonstrated the effect of pancreatic leakage following Whipple’s resection on long term outcome.

The aim of this study is to analyse the impact of pancreatic leak on disease recurrence and long term survival in patients who underwent a pancreaticoduodenectomy at Addenbrooke’s hospital for pancreatic head ductal adenocarcinoma.

PATIENTS AND METHODS

All patients who underwent a pancreaticoduodenectomy from June 2002 to June 2007 at the HPB Unit in Addenbrooke’s Hospital, Cambridge were identified from a prospectively held pancreatic database. Patients with a final postoperative histological diagnosis of pancreatic ductal adenocarcinoma were selected for inclusion in the study.

In all patients a standard Whipple’s pancreatico-duodenectomy was performed. Reconstruction consisted of an end-to-side pancreaticojejunostomy and an end-to-side- hepaticojejunostomy on a 70 cm Roux-en-Y loop. A gastrojejunal anastomosis and a side-to-side enteroenterostomy were also performed. Standard (non-extended) lymphadenectomy was carried out in all cases.

Patients undergoing Whipple’s resection had drain fluid amylase measured on a daily basis until drain removal. Pancreatic leaks were defined as drain output of any measurable volume of fluid on or after postoperative day 3 with amylase content 3 times greater than serum amylase activity according to the International Study Group of Pancreatic Fistula (ISGPF) definition [10]. In addition, fistula severity was graded as A, B, C according to ISGPF clinical criteria as follows: grade A fistula (a transient, asymptomatic fistula with only elevated drain amylase levels and treatments or deviation in clinical management are not required); grade B fistula (a symptomatic, clinically apparent fistula requiring diagnostic evaluation and therapeutic management); and grade C fistula (a severe, clinically significant fistula requiring a major deviations in clinical management and unequivocal aggressive therapeutic interventions).All patients received prophylactic octreotide (Sandostatin^®, Novartis Parmaceutical, Camberley, United Kingdom) 100 micrograms administered subcutaneously 3 times a day for 5 days and which was subsequently continued in patients with a pancreatic leak. Patients with missing fluid amylase values were excluded from the study.

Patients with a pancreatic leak were managed conservatively with a regimen of nil by mouth, total parenteral nutrition or enteral nutrition through a feeding jejunostomy, percutaneous drainage of intrabdominal collections, treatment of sepsis, wound care and octreotide. Laparotomy with wash-out and completion pancreatectomy were reserved for patients with generalized peritonitis.

All patients were followed-up life-long in the surgical clinic on a six monthly basis. CA 19-9 levels and CT scan of the chest, abdomen and pelvis were carried out during each follow-up visit. Patients with a final postoperative histology of pancreatic ductal adenocarcinoma were considered for adjuvant chemotherapy with a 5-fluorouracil or gemcitabine (mostly within the European Study Group for Pancreatic Cancer (ESPAC-3) trial [11]). None of these patients received pre-operative chemo- or radio-therapy.

Demographic details, International Union Against Cancer (UICC) disease stage, 30-day mortality, mean hospital stay and administration of adjuvant chemotherapy were noted from the database. Recurrence was deemed to be present if further lesions were noted on the follow-up CT scans, with or without an associated rise in CA 19-9 levels.

Patients were divided in two groups: those with leaks and those without.

ETHICS

Informed consent for research was obtained from each patient and the study protocol conforms to the ethical guidelines of the "World Medical Association Declaration of Helsinki - Ethical Principles for Medical Research Involving Human Subjects" adopted by the 18^th WMA General Assembly, Helsinki 1, Finland, June 1964, as revised in Tokyo2004.

STATISTICS

Overall survival was calculated by using the Kaplan-Meier method and was compared between the two groups by means of the log-rank test. Comparison of demographic details and recurrence between the two groups was performed by using the Fisher’s exact tests and the linear-by-linear chi-square. A two-tailed P value less than 0.05 was considered significant. SPSS 16.0 (SPSS, Chicago, Illinois, USA) was used for statistical analysis.

RESULTS

There were 133 Whipple’s resections carried out during the study period. The indications for pancreaticoduodenectomy are illustrated in Table 1.

 

 

Table 1. Indications for pancreaticoduodenectomy.
Histology	Number of patients
Pancreatic ductal adenocarcinoma	53 (39.8%)
Ampullary carcinoma	21 (15.7%)
Cholangiocarcinoma	14 (10.5%)
Intraductal papillary mucinous neoplasm	12 (9%)
Duodenal adenocarcinoma	7 (5.2%)
Endocrine carcinoma	7 (5.2%)
Other histology	19 (14.2%)
Total	133

 

 

Of the 53 patients with pancreatic ductal adenocarcinoma, 6 (11.3%) were excluded due to missing data. Thus 47 patients satisfied the inclusion criteria for the study of whom 9 had a pancreatic leak (19.1%) graded A (2 patients), B (6 patients) and C (1 patient). All patients with pancreatic leak were managed conservatively except for one patient (11.1%) who underwent completion total pancreatectomy.

Median follow-up was 30.8 months. Demographic and clinicopathological data for patients with and without leaks are given in Table 2. Postoperative morbidity was 29.8% (14 cases). There were no significant differences in the demographic details between the two groups. Overall median survival was 19 months for the whole cohort. Median survival in the pancreatic leak group was 16.5 months and median survival in the group without pancreatic leak was 27.5 months. However, this was not statistically significant (Figure 1; P=0.411, log-rank test).

 

 

 

 

Figure 1. Kaplan-Meier curve showing no significant difference in the overall survival following pancreaticoduodenectomy between 9 patients with pancreatic leaks and 38 patients without pancreatic leaks.

 

Recurrence occurred in 70.2% of patients (33/47), of whom 88.9% (8/9) were in the leak group and 65.8% (25/38) in the group without pancreatic leak. No statistically significant difference was noted in terms of presence of recurrence between the two groups (P=0.244, Fisher’s exact test).

DISCUSSION

Pancreatic anastomotic leaks following pancreaticoduodenectomy have an obvious negative impact on the perioperative morbidity and mortality. However, it is less clear whether this effect extends itself to long term overall and recurrence free survival. Studies which look at long term outcome following Whipple’s resection usually include peri-operative deaths (often due to pancreatic leaks) in their survival analysis. Inclusion of such deaths confuses the issue of whether pancreatic leaks have a direct effect on the oncological outcomes following Whipple’s resection. In the present study, in line with increasing numbers of publications from large volume centres, there were no peri-operative deaths. Hence the findings give a more accurate indication of the effects of pancreatic leaks on the overall and disease free survival.

The presence of a significant post-operative pancreatic leak could be associated with reduced immunity in the patient, thus leading to an increased risk of recurrence and poor survival. Some authors have demonstrated that post operative drain fluid cytology from the pancreatic bed after ‘curative’ resection contained malignant cells and was related to long term outcome [12]. It has also been shown that exfoliated malignant cells have the potential to grow in-vitro and in immunosuppressed animal models [13]. We were unable to show a statistically significant difference in the overall and disease free survival in patients with pancreatic leak.

It could also be argued that the local sepsis and caustic environment associated with a pancreatic leak might have a local beneficial effect in inhibiting recurrence by destroying any residual malignant cells remaining in the pancreatic bed. However, there is nothing in our study to support this hypothesis with equivalent survival shown in both groups. It is not clear from this study whether the presence of a pancreatic leak in the post operative period might have an effect in reducing life span from natural other than cancer related causes. It is possible that major surgery with its inherent complications might enhance any associated co-morbidities in the patient thus reducing the overall life span. However, this study was neither designed nor powered to look at reduced life span from non cancer causes. Looking for any underlying association with post-operative pancreatic leaks we found that there were no major demographic or clinicopathological differences between the pancreatic leak group and the group without pancreatic leaks. We have kept the selection criteria for this study deliberately strict by including only those patients with pancreatic head ductal adenocarcinoma (excluding periampullary carcinomas, cholangiocarcinomas, cystic cancers and neuroendocrine carcinomas). Similarly the definition of pancreatic leak was kept uniform and objective by adopting the ISGPF criteria. This, we believe, strengthens the conclusions of the study despite the low number of patients. The limitations of this retrospective study would need to be addressed in a larger prospective cohort study in order to confirm these findings.

 

Received December 2^nd, 2009 - Accepted February 16^th, 2010

Key words Fistula; Pancreatic Neoplasms; Pancreaticoduodenectomy; Prognosis; Survival

Abbreviations ESPAC: European Study Group for Pancreatic Cancer; ISGPF: International Study Group of Pancreatic Fistula

Conflict of interest The authors have no potential conflict of interest

Correspondence
Raaj Praseedom
Box 202
Addenbrooke’s Hospital
Cambridge CB2 2QQ
United Kingdom
Phone: +44-1223.256.040
Fax: +44-1223.216.015
E-mail: raaj.praseedom@addenbrookes.nhs.uk

 

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