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J Thorac Cardiovasc Surg 1997;114:544-551
© 1997 Mosby, Inc.
GENERAL THORACIC SURGERY |
Received for publication July 9, 1996 revisions requested Nov. 18, 1996; revisions received May 6, 1997 accepted for publication May 22, 1997. Address for reprints: Chung-Ping Hsu, MD, Division of Thoracic Surgery, Department of Surgery, Taichung Veterans General Hospital, #160, Sec 3, Taichung-Kang Rd., Taichung, Taiwan, Republic of China.
Abstract
Objectives: We evaluated the pattern of nodal metastasis and its prognosis after radical lymphadenectomy in adenocarcinoma of the gastric cardia. Methods: We conducted a retrospective cohort study of 70 patients (52 men and 18 women; mean age 63.6 years) with adenocarcinomas of the gastric cardia who underwent extended gastrectomy (65 total gastrectomies and 5 proximal gastrectomies) and radical lymphadenectomy (D2 to D4) at Taichung Veterans General Hospital between 1989 and 1995. Results: Twenty-four complications developed in 22 (31.4%) patients, and seven (10.0%) hospital deaths occurred. An overall 5-year cumulative survival of 37.6% was obtained. Lymph node metastases were identified in 53 (75.7%) patients. Nodal involvement was closely related to the depth of tumor invasion ( p = 0.005). When the gastric wall invasion was limited to the subserosal layer (T1 and T2, n = 15), no patient had N4 group nodal metastasis. Once the serosal layer had been involved (beyond T3), N4 group nodal metastasis was frequently seen (30.9%, 17 of 55 patients). A multivariable analysis revealed that the level of nodal involvement, the depth of tumor invasion, and the presence of complications were independent prognostic factors. Cumulative 5-year survivals of curability A ( n = 12), B ( n = 19), and C ( n = 32) resections were 100%, 21.2%, and 27.5%, respectively ( p = 0.0001). The long-term survival of the patients after resection was also closely related to their pTNM stages ( p = 0.0004). Conclusions: We conclude that gastrectomy accompanied by radical lymphadenectomy provides a reasonable long-term survival expectancy that is closely related to the stage of the disease and the curability of resection.
Surgical resection is the treatment of choice for cancer of the stomach if no distant metastases exist. Japanese experience further confirms the importance of radical lymph node dissection in addition to gastrectomy.
1,2 Cancer of the gastric cardia accounts for 5% to 25% of gastric cancers. 2-4 Its prevalence has been steadily increasing in Western countries in recent years. 5 Different surgical approaches have been applied to tumors of this particular anatomic site, focusing on either the thoracic side or the abdominal side. For a long period (before 1989), we performed tumor resections of the gastric cardia either through separate abdominal and thoracic incisions or through a thoracoabdominal incision with D1 to D2 lymph node dissection. However, experience showed that intrathoracic lymphatic spread up to the subcarinal level is unusual. 6 Besides, with the use of the EEA stapling device (Auto Suture Company Division, United States Surgical Corporation, Norwalk, Conn.), a satisfactory segment of the distal esophagus can be resected and anastomosed safely. Since 1989, the majority of surgical resections for adenocarcinoma of the gastric cardia in this institute have been performed exclusively through the abdominal side. This retrospective cohort study presents our recent experience and results in treating adenocarcinoma of the gastric cardia by an abdominal approach with gastrectomy and radical lymphadenectomy (D2 to D4).
Patients and methods
Between January 1, 1989, and December 31, 1995, 392 patients with adenocarcinoma of the stomach, who underwent extended gastrectomy and radical lymphadenectomy (D2 to D4) at Taichung Veterans General Hospital, were included in this retrospective cohort study. The exclusion criteria for radical lymphadenectomy includes disseminated peritoneal tumor seeding, multiple organ invasion, and poor cardiopulmonary function of the patient. Among these, 70 consecutive patients with adenocarcinoma of the gastric cardia were enrolled in this study. The group comprised 52 men and 18 women. The mean ages at diagnosis for male and female patients were 65.8 years and 57.0 years, respectively. Table I shows the demographic data of these patients.
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(Table II) and curability of resection for carcinoma of the gastric cardia as set up by the Japanese Research Society for Gastric Cancer were adopted in this study. 7 In brief, group 1 to 4 nodes, group 5 to 11 nodes, group 12 to 14 nodes, and group 15 and 16 nodes were classified as N1, N2, N3, and N4 groups, respectively. D2 stands for lymphadenectomy of the N1 and N2 groups; D3 stands for lymphadenectomy of the N1, N2, and N3 groups; and D4 stands for lymphadenectomy of the N1, N2, N3, and N4 groups. Patients with a T1 or T2 lesion, with the nodal metastasis confined to N1 group (N0 or N1), with an adequate lymphadenectomy (
D1 for N0, D2 for N1), and without peritoneal seeding (P0), liver invasion (H0), or distant metastasis (M0) who underwent gastric resection with a microscopically safe margin (5 mm) were classified as having curability A resection. Patients with peritoneal seeding, direct contagious organ invasion (T4) even after complete resection, or residual tumor were classified as having curability C resection. Patients in between were classified as having curability B resection. No patient was lost to follow-up in the study period. All of the current survivors have been followed up for more than 12 months (12 to 81 months).
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8 The log-rank test was used to interpret the statistical difference between survival curves. The Cox proportional hazards model, 8 assessed by the survival data of all 70 patients, was used for multivariable survival analysis in the manner of forward stepwise regression. The covariates were assigned to the model until the log-likelihood ratio stopped improving over the previous step at a 0.05 level. Then the prognostic factors were entered into the multivariable model, which offered a predictive relative hazards of mortality for the selected factors.
The association of an ordinal categoric response variable to a covariate was measured by the proportional odds model. 9 The statistical significance of the relationship was assessed by likelihood ratio tests. The odds ratio of one unit increment in the covariate was derived from the model and evaluated the change of odds for patients likely to lie in higher levels of the ordinal response variable.
Survivals, Cox's model, and the proportional odds model were calculated by the 1L, 2L, and PR programs, respectively, in the BMDP statistical software. 10
Results
Current status of the patients.
At the end point of this study (December 31, 1996), 29 patients were still alive and 41 patients had died. No patient was lost to follow-up. All of the patients had been followed up for at least 12 months (12 to 81 months).
Complications and deaths.
There were 24 complications (34.3%), which occurred in 22 patients (31.4%), and seven hospital deaths (10.0%). The causes of complications and deaths are listed in Table III . The most common complications included pancreatic fistula and abdominal abscess, and the leading cause of death was sepsis.
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Table IV . A total of 3121 (average 44.6 in 70 patients) lymph nodes were resected, and 691 (average 13.0 in 53 patients) lymph nodes had metastases. None of the D2 group had N2 group lymph node metastasis. One of the D3 group had N3 group lymph node metastasis. The relation between the extent of the lymphadenectomy and nodal metastasis is listed in Table V (p = 0.008). The odds ratio of D4 to D2+D3 was 5.9 (95% confidence interval [CI] was 1.5 to 23.0). This showed that patients who underwent D4 dissection were 5.9 times more likely to have nodal metastases than patients having D2+D3 dissection.
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Table V (p = 0.005). The odds ratios of T3 and T4 to T1+T2 were 4.7 (95% CI was 1.4 to 17.0) and 6.8 (95% CI was 2.0 to 23.0), respectively. The 5-year cumulative survivals of patients with T1 through T4 lesions were 100%, 71.4%, 27.8%, and 20.1%, respectively. The 5-year cumulative survivals of patients with node-negative and node-positive disease were 68.4% and 27.5%, respectively.
Curability of resection.
Curability A resections were accomplished in 12 patients, curability B resections in 21 patients, and curability C resections in 37 patients. The 5-year cumulative survivals of patients having curability A, B, and C resections were 100%, 21.2%, and 27.5%, respectively. Curability A resections had a better prognosis than B and C resections (curability A vs curability B, p = 0.0003; curability A vs curability C, p = 0.00005).
TNM stage of the tumor.
The clinicopathologic TNM stages of the patients were as follows: stage Ia, six patients; stage Ib, three patients; stage II, eight patients; stage IIIa, 13 patients; stage IIIb, 17 patients; and stage IV, 23 patients. The overall cumulative survival curve is shown in Fig. 1 , with a 5-year survival of 37.6%. The 5-year cumulative survivals in patients in pTNM stages I through IV were 100%, 62.5%, 23.0%, and 17.4%, respectively (p = 0.0004).
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Table VI .
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Discussion
The incidence of carcinoma of the gastric cardia has increased steadily in recent years, especially in Western countries. 5,11,12 Various definitions have been used to describe the "gastric cardia." 4,13,14 In this report, we use a broader definition based on the criteria proposed by the Japanese Research Society for Gastric Cancer. 7 During the study period, 392 gastric carcinomas were managed by radical lymphadenectomy in this institute, and 70 (17.9%) of them were adenocarcinoma of the gastric cardia. The prevalence of adenocarcinoma of the gastric cardia was roughly as reported by others. 2,3
The generally accepted concept of severe gastroesophageal reflux after proximal gastrectomy has limited its clinical popularity in recent years. 15 Besides, both inadequate surgical margins and limitations of lymphadenectomy are potential drawbacks. Five of our patients received a proximal gastrectomy; nevertheless, all of them had lymph node dissection up to the N4 group. Most of our patients (92.9%) received a total gastrectomy and Roux-en-Y type esophagojejunostomy to restore digestive tract continuity. All of the patients who underwent proximal gastrectomy (n = 5) had various degrees of gastroesophageal reflux. However, none of the patients who underwent total gastrectomy had symptoms of gastroesophageal reflux after a Roux-en-Y esophagojejunostomy or its modifications for bile diversion. It is still debatable whether to perform a combined resection of the spleen and pancreas. 1,16,17 Unless the pancreas is directly involved by the tumor, we prefer to perform a pancreas-preserving splenectomy during gastrectomy, as proposed by Maruyama and colleagues. 18 Tumor metastases to the splenic hilum and splenic artery were observed in 13.6% and 25.4% of the patients, respectively. Six (8.6%) pancreatic fistulas developed, one of which caused a hospital death. All of them occurred in patients who received a distal pancreatectomy. Our experience showed that a routine distal pancreatectomy is not necessary for lymph node dissection at the splenic hilum, pancreatic tail, and along the course of the splenic artery. Adequate lymphadenectomy can be obtained, and pancreatic fistula can be avoided.
Great concern about the length of distal esophagectomy has been raised and emphasized. 3,19-21 However, others have preferred an abdominal approach for resection of carcinoma of the gastric cardia. 1,2,22 We believe that the type of operation is basically dependent on the type of tumor and its extent of esophageal involvement. 23 In Western countries, more type I cancers of the cardia (originating from Barrett's epithelium) were encountered, although most of our cardia cancers were either type II or type III instead. We had only one proved case of Barrett's esophagus inducing early adenocarcinoma of the cardia in this series. Since 1989, the majority of gastrectomies for adenocarcinoma of the gastric cardia have been performed exclusively through an abdominal approach. We found that resection of the distal esophagus through an enlarged hiatus is not difficult. Usually the esophagus can be transected at least 3 to 6 cm above the tumor border. The digestive continuity then can be restored by an EEA stapler instead of by hand sewing. With this approach, respiratory complications can be minimized, and the likelihood of anastomotic leakage can be lowered when compared with results of previous experience (4.3% vs 7.6%, p = 0.4). 24 Residual tumor on the esophageal cut margin or anastomotic recurrence was not a major problem in our series. Only one of our patients had a microscopically diseased esophageal cut end on pathologic examination. Postoperative irradiation was implemented, and local recurrence did not develop before he died of liver metastasis. Furthermore, none of the patients had tumor recurrence at the residual esophageal segment. We believe long-distance submucosal tumor infiltration in adenocarcinoma of the gastric cardia is not so frequently seen as it is in squamous cell carcinoma of the esophagus. A safe margin of 3 to 6 cm above the tumor is mandatory. Another reason for adopting a transabdominal approach emanates from a report from one of our associated hospitals, which demonstrated zero incidence of lymph node metastasis at the subcarinal region. 6 We therefore recommend a transabdominal approach for resection of adenocarcinoma of the gastric cardia.
The importance of radical lymphadenectomy has been repeatedly emphasized, especially in the Japanese series. 1,2,25 Its benefits had even been pointed out in node-negative early gastric carcinoma and in noncurative gastrectomy. 26,27 The adequacy of lymphadenectomy in this series can be proved by an average of 44.6 dissected nodes per patient. D2 dissection was performed in five patients (T1 in three, T2 in two), and none of them had N2 metastasis. D3 dissection was performed in five patients (T1 in four, T3 in one), and only one patient had N3 metastasis. The remainder (n = 60, 85.7%) received radical lymphadenectomy to the paraaortic region. Complications related to lymphadenectomy were pancreatic fistula, abdominal abscess, and prolonged lymphatic leak. The overall complication and mortality rates of 31.4% and 10.0% were higher than in our previous experience (17.4%, p = 0.009; 5.9%, p = 0.3), but they were similar to the Dutch experiences. 28
Our data furthermore demonstrated that the level of nodal metastasis is closely related to the depth of tumor invasion (p = 0.005), as reported by others. 29,30 Moreover, multivariable analysis revealed that both the T factor and N factor are independent prognostic factors, as they were in the German report. 31 The prognoses of patients with T3 to T4 tumors or patients with N3 to N4 nodal metastasis are much worse than the prognoses of their counterparts.
Not only the stage of the tumor, but also the degree of curability in resection is important for prognostic prediction. A curability A resection provides the best opportunity for long-term survival. According to the definition of the Japanese Research Society for Gastric Cancer, only patients with a T1 or T2 lesion, with their nodal metastasis confined to N1 group (N0 or N1), with an adequate lymphadenectomy (D1 for N0, D2 for N1), and without peritoneal seeding (P0), liver invasion (H0), or distant metastasis (M0), and who underwent gastric resection with a microscopically safe margin (5 mm) can be classified as having had a curability A resection. Unlike the Japanese reports, the diagnosis in most of our patients was made at a relatively late stage. Only 12 (17.1%) procedures can be classified as curability A resections. On the contrary, more than half (n = 37, 52.9%) of our patients received a curability C resection. The main reason for the stage of disease being classified as advanced was detection of T4 lesion or direct invasion of the regional omentum or mesocolon by the tumor during the operation. Both of these factors subsequently led to an overall poorer outcome. Early diagnosis provides the only way to achieve a curability A resection and long-term survival.
Early gastric cancers (mucosa and submucosa) were identified in eight patients; however, only six of them had node-negative disease (stage Ia). This group of patients, together with those having T2 N0 and T1 N1 (stage Ib, n = 3) disease, all had a 100% survival at 5 years. Once the tumor invaded beyond the submucosal layer (T3 and T4 lesions), 82.3% (51 of 62 patients) of the patients in this series had nodal involvement. Except in T1 tumor, our data support a radical lymphadenectomy to achieve complete tumor resection. Besides, accurate tumor staging can be obtained only through a thorough lymphadenectomy. This is also essential for elimination of the stage migration phenomenon. 32 An overall 5-year survival of 37.6% was obtained in this series, which was much better than a previous report from this institute (6.7% 5-year survival). 24 To some extent, we believe that the changes in our attitude toward adenocarcinoma of the gastric cardia, using a more radical intraabdominal lymphadenectomy in addition to extended gastrectomy, contributed to the better outcome in this series. Comparison of the survivals revealed statistically significant survival differences among different stages (p = 0.0004). Patients with stage I and stage II tumors had 5-year survivals of 100.0% and 62.5%, respectively. A tumor of stage IIIa or above indicates a poor prognosis, but the results in this study are still better than our previous results.
Long-term follow-up of the patients revealed that the majority died of systemic metastasis. Local recurrence at the esophageal anastomotic site was not observed if an adequate length (more than 3 cm) was excised. However, a local recurrence did develop at the gastric remnant after a proximal gastrectomy in one patient. Despite a completion total gastrectomy, a local recurrence still developed at the lower end of the esophagus, which led to a transhiatal esophagectomy and colon interposition, as described in the Results section. Thus a proximal gastrectomy should be avoided whenever possible, not only to eliminate gastroesophageal reflux, but also to prevent tumor recurrence at the gastric remnant.
Our experience demonstrates that through an abdominal approach (extended gastrectomy including distal esophagectomy), radical lymphadenectomy can be safely performed with an acceptable morbidity and mortality rate. Esophagojejunostomy with an EEA stapler through an enlarged esophageal hiatus significantly decreased the prevalence of anastomotic leak. However, increased intraabdominal complications associated with radical lymphadenectomy were observed. Long-term survival of these patients was dramatically improved in this institute by a more aggressive attitude with the use of extended gastrectomy and radical lymphadenectomy for adenocarcinoma of the gastric cardia.
Footnotes
From the Divisions of Thoracica and General Surgery,b Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan, Republic of China. 
References
This article has been cited by other articles:
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  C. Pedrazzani, G. de Manzoni, D. Marrelli, S. Giacopuzzi, G. Corso, A. M. Minicozzi, B. Rampone, and F. Roviello Lymph node involvement in advanced gastroesophageal junction adenocarcinoma J. Thorac. Cardiovasc. Surg., August 1, 2007; 134(2): 378 - 385. [Abstract] [Full Text] [PDF]
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 G. de Manzoni, C. Pedrazzani, F. Pasini, A. Di Leo, E. Durante, G. Castaldini, and C. Cordiano Results of surgical treatment of adenocarcinoma of the gastric cardia Ann. Thorac. Surg., April 1, 2002; 73(4): 1035 - 1040. [Abstract] [Full Text] [PDF]
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