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From the Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York.
Correspondence: Address correspondence and reprint requests to: David P. Jaques, MD, FACS, Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10021; Fax: 212-717-3645; E-mail: jaquesd{at}mskcc.org
| ABSTRACT |
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Methods: From July 1985 to August 2001, 335 patients underwent resection of proximal gastric or GEJ (type II and III) cancers. Clinical and pathologic factors were retrieved from a prospective database.
Results: Overall morbidity was 59% (infectious complications, 41%; noninfectious complications, 36%), and mortality was 4.5%. Splenectomy was associated with a higher rate of infectious complications (57% vs. 33%; P < .01) but not of noninfectious complications (39% vs. 34%; not significant) or mortality (4% vs. 5%; not significant). Splenectomy was also associated with a higher rate of infectious complications on multivariate analysis (hazard ratio, 2.4; P < .01).
Conclusions: Morbidity after resection of proximal gastric and GEJ cancer is significant; splenectomy is associated with increased morbidity, but not mortality, in these patients. Because these complications can be managed without an increase in mortality, splenectomy should be performed when indicated by the extent of the tumor.
Key Words: Gastric cancer Gastrectomy Splenectomy Complications
| INTRODUCTION |
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Splenectomy, which is performed in an effort to increase tumor clearance or because of accidental injury, is associated with an increased incidence of postoperative infectious complications.36 Prospective, randomized trials, however, have not demonstrated an improved outcome for patients who undergo extended lymphadenectomy, splenectomy, or both.57 An increased incidence of complications and a lack of an improved outcome in patients who undergo splenectomy has led most authors to recommend splenic preservation in the surgical treatment of gastric cancer. In proximal gastric and gastroesophageal junction (GEJ) cancers, however, lymph node metastases are found more frequently in the splenic hilum. Therefore, some surgeons still consider splenectomy for these tumors.810
Several studies have investigated the association of splenectomy with postoperative complications in patients who undergo gastrectomy for gastric cancer. Because resection of proximal compared with distal gastric tumors is associated with higher morbidity and because splenectomy is more often performed in proximal tumors, these analyses may be biased. The aim of this study was to describe the association of splenectomy with complications in patients who undergo resection of proximal gastric and GEJ cancers.
| PATIENTS AND METHODS |
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Patient demographics; tumor characteristics; treatment-related factors, including postoperative complications; and hospital course were analyzed. Perioperative transfusion was defined as allogeneic blood transfusion during surgery or the first two postoperative days. We did not include all transfusions the patients received during the hospital stay in this analysis, because some patients who developed complications received blood transfusions after the complication had developed. Inclusion of all transfusions would therefore bias the analysis of risk factors for complications.
Infectious complications included sepsis, anastomotic leak, intra-abdominal abscess, pancreatic fistula, infectious diarrhea, pneumonia, catheter sepsis, and wound and urinary tract infections. Noninfectious complications consisted of renal failure, postoperative hemorrhage, pulmonary embolism, atelectasis, cardiac complications, pneumothorax, pleural effusion, deep vein thrombosis, stroke, and urinary retention. The specific definitions of these complications have been published previously.2
The severity of complications was determined by using a grading system implemented at Memorial Sloan-Kettering Cancer Center. This system scores complications by severity from 1 to 5 (1, oral medication/bedside management; 2, intravenous treatment; 3, operative or radiological reintervention; 4, chronic disability; 5, death). Tumor stage and grade were classified according to the 5th edition of the tumor-node-metastasis classification by the International Union Against Cancer and the American Joint Committee on Cancer.12
Statistical Analysis
Statistical computations were performed with JMP (SAS Institute, Cary, NC) and SPSS (SPSS Inc., Chicago, IL). Continuous variables were expressed as medians and were compared by using the Wilcoxon test, whereas categorical variables were compared by using the Fishers exact or
2 test. Multivariate logistic regression was performed by incorporating factors with a P value
.1 on univariate analysis. Statistical significance was defined as P
.05.
| RESULTS |
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Table 3 lists the patient and tumor characteristics associated with splenectomy. From this analysis, it is apparent that splenectomy was more commonly performed for larger, more advanced tumors.
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14 lymph nodes removed (73% vs. 62%; P = .04). Splenectomy was associated with greater blood loss (1000 vs. 575 mL; P < .01), a higher transfusion rate (60% vs. 34%; P < .01), a longer hospital stay (15 vs. 14 days; P < .01), a higher reintervention rate (15% vs. 8%; P = .04), and a higher rate of infectious (57% vs. 33%; P < .01) but not of noninfectious (39% vs. 34%; not significant) complications. Splenectomy was specifically associated with a higher rate of grade 2 (26% vs. 16%; P = .03) and grade 3 (20% vs. 9%; P < .01) infectious complications, but mortality was not increased (4% vs. 5%; not significant). Pneumonia (34% vs. 11%; P < .01) and intra-abdominal abscesses (13% vs. 5%; P = .01) showed the strongest correlation with splenectomy.
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750 mL were associated with an increased incidence of such complications. No tumor-related factorsuch as tumor-node-metastasis stage, tumor size, vascular or perineural invasion, or differentiationwas associated with infectious complications. The incidence of infectious complications in patients who underwent an unplanned splenectomy (for example, because of bleeding) was 47% (9 of 19), compared with 56% (43 of 77) in patients with a splenectomy due to the extent of the tumor (P = not significant). The rate of infectious complications in patients who underwent splenectomy and pancreatectomy was 58% (14 of 25), compared with 56% (46 of 80) in patients who underwent splenectomy alone (P = not significant).
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65 years and an intrathoracic anastomosis (Table 7).
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| DISCUSSION |
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The objective of splenectomy in the surgical treatment of gastric cancer is to facilitate a more complete lymphadenectomy by thorough clearance of the lymph nodes in the splenic hilum. This might be especially important in proximal gastric or GEJ cancers, which are known to have a higher incidence of lymph node metastases in the splenic hilum.8,9 Numerous retrospective, as well as prospective, randomized trials, however, have not demonstrated a prognostic benefit for splenectomy or extended lymphadenectomy.3,57,15 It is also well documented that a sufficient lymphadenectomy in the splenic hilum can be achieved without splenectomy and that a D2 lymphadenectomy can be performed without added morbidity, thereby demonstrating a differential effect of D2 lymphadenectomy and splenectomy on morbidity.16,17
Splenectomy has long been associated with postoperative infectious complications, as has been demonstrated in patients with benign diseases and incidental splenectomy.18,19 Three prior randomized trials drew conclusions regarding the effect of splenectomy on morbidity in patients undergoing resection of gastric cancer:36,20
In the randomized trial performed by Csendes et al.,6 splenectomy was associated with an increased risk of postoperative fever (50% vs. 39%; P < .04), pulmonary complications (35% vs. 24%; P < .08), and subphrenic abscess formation (11% vs. 4%; P < .05), but not of wound infections (18% vs. 11%; not significant). The incidence of reoperations (11.1% vs. 9.3%; not significant) and postoperative mortality (4.4% vs. 3.1%; not significant) did not differ between groups.
In the Dutch Gastric Cancer Trial, splenectomy was the most significant risk factor for overall complications, with a risk ratio of 2.13.20 In this trial, patients were randomized to a D1 versus D2 lymphadenectomy. In the D1 group, 11% of patients underwent a splenectomy and 3% underwent a pancreatectomy, compared with 37% and 30%, respectively, in the D2 group. Patients in the D2 group had a higher rate of complications (43% vs. 25%; P < .001) and postoperative death (10% vs. 4%; P = .004).5 In the Medical Research Council trial, patients randomized to the D2 group experienced higher rates of postoperative morbidity (46% vs. 28%; P < .001) and mortality (13% vs. 6.5%; P = .04), likely because of an increased incidence of pancreaticosplenectomy and splenectomy in the D2 group.4
Other factors also have to be considered when postoperative complications of gastric cancer are discussed. A large retrospective study, for example, identified male sex, age, type of procedure, lack of perioperative antibiotic prophylaxis, and splenectomy as independent risk factors.14 A recent study from our institution, which considered all patients with gastric cancer, identified resection of two or more organs as a significant risk factor for postoperative complications, and the spleen was the most frequent organ resected.15
This study is unique in that it studied several patient-, tumor-, and treatment-related factors in their association with postoperative complications in a homogenous patient group and in that it used a grading system for postoperative complications. The overall morbidity was 59% (infectious complications, 41%; noninfectious complications, 36%), reflecting the high efficiency of the reporting system for complications in our institution. The breakdown according to grade of complication demonstrates that 35% of all patients had a grade 1 or 2 complication (treated without reintervention). Seventeen percent of all patients had a grade 3 complication that led to surgery or another form of invasive reintervention. Chronic disability (grade 4 complication) occurred in 2.5% of patients, and perioperative mortality was 4.5%.
As expected, splenectomy was performed more often in advanced tumors, commensurate with our policy to perform a selective splenectomy. Splenectomy was associated with a higher rate of infectious complications (57% vs. 33%; P < .01), but not of noninfectious complications (39% vs. 34%; not significant) or mortality (4% vs. 5%; not significant). Splenectomy was specifically associated with a higher rate of grade 2 (26% vs. 16%; P = .03) and grade 3 (20% vs. 9%; P < .01) infectious complications. This analysis demonstrates that a substantial proportion of the complications associated with splenectomy led to a reintervention but that mortality was not increased. Pneumonia (34% vs. 11%; P < .01) and intra-abdominal abscesses (13% vs. 5%; P = .01) showed the strongest association with splenectomy, which is in accordance with the randomized trial performed by Csendes et al.6
On univariate analysis, splenectomy was also associated with more intraoperative blood loss, a higher rate of perioperative blood transfusions, and a longer hospital stay. On multivariate analysis, splenectomy was the strongest risk factor for infectious complications, with a hazard ratio of 2.4 (95% confidence interval, 1.34.4).
The increased incidence of infectious complications after splenectomy could be explained by impaired immunological function after splenectomy, because splenectomy is thought to be associated with impaired phagocytic activity, decreased antibody response, and altered levels of immunoglobulins and T-cell function.21 This concept is supported by clinical reports demonstrating a suppression of immune function after splenectomy in gastric cancer patients.22
Nonimmunological reasons for the increase in infectious complications should also be considered. Splenectomy, for example, increases the risk of pancreatic fistulas, which can cause subphrenic abscesses; in addition, splenectomy results in a relative dead space underneath the left diaphragm, and this potentially increases the risk of fluid accumulation and abscess formation.
We were able to identify factors other than splenectomy that were associated with infectious complications, such as an ASA score of III or IV or preoperative weight loss. High intraoperative blood loss and longer operative time, but not D2 lymphadenectomy, were also identified as independent risk factors. This analysis demonstrates the importance of considering not only splenectomy, but also other relevant factors, when infectious complications after gastric resection are discussed. Our study also demonstrates the importance of stratifying complications into infectious and noninfectious groups, because different risk factors can be identified for both groups. Grading the complications allows an assessment of the actual effect of the complications on the postoperative management of patients with gastric cancer.
| CONCLUSIONS |
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| ACKNOWLEDGMENTS |
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| FOOTNOTES |
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Received for publication March 8, 2003. Accepted for publication March 24, 2004.
| REFERENCES |
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This article has been cited by other articles:
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K. R. Shen, S. D. Cassivi, C. Deschamps, M. S. Allen, F. C. Nichols III, W. S. Harmsen, and P. C. Pairolero Surgical treatment of tumors of the proximal stomach with involvement of the distal esophagus: A 26-year experience with Siewert type III tumors J. Thorac. Cardiovasc. Surg., October 1, 2006; 132(4): 755 - 762. [Abstract] [Full Text] [PDF] |
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