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Ann Thorac Surg 1996;61:1087-1091
© 1996 The Society of Thoracic Surgeons
Departments of Thoracic Surgery and Pulmonary Medicine, Antonius Hospital, Nieuwegein, the Netherlands, and Department of Thoracic Surgery, University Hospital of Antwerp, Edegem, Belgium
Accepted for publication December 14, 1995.
| Abstract |
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Methods. From 1960 to 1989, 145 patients underwent bronchial sleeve resection for a bronchogenic tumor. Follow-up was updated until the end of 1994, so the minimum follow-up was 5 years for surviving patients. A univariate analysis and a multivariate analysis were performed.
Results. For the whole group, 5-year, 10-year, and 15-year survival rates were 46%, 33%, and 22%, respectively. The median survival time was 53 months. Five-year and 10-year survival rates for the 71 patients with N0 disease were 62% and 51%, respectively; for the 58 patients with N1 disease, 31% and 10%; and for the 16 patients with N2 disease, 5-year and 7-year survival rates were 31% and 13%. There was a highly significant difference in survival between patients with N0 and N1 or N2 disease but not between those with N1 and N2 disease. Multivariate analysis showed only nodal stage and patient age to be significant factors in relation to survival.
Conclusions. Long-term results after bronchial sleeve resection are influenced chiefly by nodal stage. A significantly lower survival is found in patients with N1 and N2 disease, and most of these patients die of distant metastases.
| Introduction |
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| Material and Methods |
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Preoperatively a cervical mediastinoscopy was performed in 128 patients (88.3%). Most of the 17 patients (11.7%) who did not have mediastinoscopy had carcinoid tumors. In 139 patients, a sleeve lobectomy was performed, on the right side in 119 and on the left side in 20. The most common procedure was sleeve lobectomy of the right upper lobe (117 patients, 80.7%). Six patients (4.1%) underwent a full sleeve resection of the main bronchus without resection of lung parenchyma, on the left side in 4 and on the right side in 2. In 9 patients (6.2%), a concomitant procedure on the pulmonary artery was performed: four sleeve resections, four wedge excisions, and one transection and reanastomosis of the pulmonary artery to facilitate bronchial access during sleeve resection of the right main bronchus.
Histologic examination of the resected specimen showed squamous cell carcinoma in 116 patients (80.0%), carcinoid tumor in 13 (9.0%), adenocarcinoma or adenosquamous carcinoma in 9 (6.2%), and other malignant diagnoses in the remaining 7 patients (4.8%).
All 145 patients were staged according to the most recent TNM classification [5]. Results are given in Table 1
. Stage I disease was found in 61 patients (42.1%), stage II in 47 (32.4%), stage IIIA in 33 (22.8%), and stage IIIB in 4 (2.8%). The 58 patients with N1 disease were subdivided into those with N1 proximal disease (16 patients) (metastatic lymph nodes present between the upper lobe and main bronchus) and those with N1 distal disease (42 patients) (more peripheral lymph nodes involved).
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Information was gathered from the files of the patients followed in our institution, and for the others, follow-up data were obtained from the referring pulmonary physicians. Survival rates were calculated and analyzed using SPSS version 6.1 for Windows (SPSS Inc, Chicago, IL). Survival curves were obtained according to the Kaplan-Meier actuarial method, and all causes of death were included. Survival between subgroups was compared with the log-rank test or Tarone-Ware test. Multivariate analysis was performed according to the Cox proportional hazards model. A stepwise forward logistic regression method was used. Eleven variables were entered into this model: age, sex, histology, nodal status, stage, concomitant procedure on pulmonary artery, completion pneumonectomy, diagnosis of second primary lung cancer, compromised lung function, side of tumor, and location of tumor.
A
2 test with continuity correction where necessary was used for rectangular contingency tables. A p value of less than 0.05 was considered significant. Where appropriate, 95% confidence intervals (CI) were mentioned.
| Results |
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Operative mortality was 4.8% (7 patients) and was included in the survival data [1]. The actuarial survival rate for all 145 patients was 0.46 ± 0.04 after 5 years, 0.33 ± 0.04 after 10 years, and 0.22 ± 0.05 after 15 years (Fig 1
). Median survival time (MST) was 53 months (95% CI, 32 to 74 months). During follow-up, 102 patients (70.3%) died. Causes of death are listed in Table 2
. At the end of follow-up, 43 patients (29.7%) were alive with no evidence of disease.
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Regarding lymph node involvement, MST for the 71 patients with N0 disease was 124 months (95% CI, 86 to 162 months). Five-year, 10-year, and 15-year survival rates were 0.62 ± 0.06, 0.51 ± 0.06, and 0.34 ± 0.07, respectively (Fig 2
). For the 58 patients with N1 disease, MST was 36 months (95% CI, 23 to 49 months), and 5-year and 10-year survival rates were 0.31 ± 0.06 and 0.10 ± 0.08, respectively. Median survival time for the 16 patients with N2 disease was 15 months (95% CI, 12 to 18 months), and 5-year and 7-year survival rates were 0.31 ± 0.12 and 0.13 ± 0.08, respectively. A highly significant difference was found between N0 and N1 disease (p = 0.0002) and between N0 and N2 disease (p < 0.0001) but not between N1 and N2 disease (p = 0.11).
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Survival by stage for all 145 patients is given in Table 3
. There was a significant difference between stage I and stage II disease (p = 0.0019) and between stage I and stage IIIB disease (p = 0.0034) but not between the other disease stages. There was no significant difference in survival between patients with T2 and T3 tumors (p = 0.17), compromised and noncompromised lung function (p = 0.21), right-sided and left-sided tumors (p = 0.82), upper and lower lobe tumors (p = 0.27), and concomitant procedure on pulmonary artery and no procedure (p = 0.98). There was a trend toward significance between male and female patients (p = 0.07 by log-rank test and p = 0.09 by Tarone-Ware test).
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Causes of death were analyzed by nodal category (Table 4
). Among the different N groups, there was no difference in local recurrence rate as a cause of death (p > 0.25). However, comparing distant metastases between N0 disease and the two other subgroups, the difference was highly significant (p < 0.005).
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| Comment |
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The review by Tedder and associates [7] published in 1992 included 1,915 patients who underwent bronchoplastic procedures for malignancy over a 12-year period. Sleeve lobectomy was most often performed for squamous cell carcinoma localized to the right upper lobe orifice. In our series, 80.7% of patients had sleeve lobectomy of the right upper lobe and in the recent series of Mehran and associates [4], 65.5%. Thirty-day mortality for sleeve lobectomy in the review by Tedder and co-workers [7] was 5.5%, and causes of death were mainly respiratory failure and cardiac-related events. In our series, operative mortality was 4.8% and in the series of Mehran and colleagues [4], only 2.1%. The review of Tedder and coauthors [7] showed that postoperative complications were mainly pneumonia and atelectasis (15.1%), benign stricture or stenosis (4.8%), bronchopleural fistula (3.0%), and bronchovascular fistula (2.5%). The local recurrence rate after sleeve lobectomy was 12.5% in that series [7], 23% in the series of Mehran and colleagues [4], and 20% (29 patients) in our series with a minimum follow-up of 5 years. Five of those 29 patients underwent completion pneumonectomy.
In the review [7], the 5-year survival rate after sleeve lobectomy for bronchogenic carcinoma was 40%; it was 63% for stage I disease, 37% for stage II disease, and 21% for stage III disease. We found similar results; the overall 5-year survival rate was 46%; 5-year survival was 59% for stage I disease, 30% for stage II disease, 48% for stage IIIA disease, and 25% for stage IIIB disease. Regarding histology, the longest survival was noted among patients with carcinoid tumor with a 15-year survival rate of 100%. This finding is consistent with the 5-year survival rate of 96% found by Tedder and colleagues [7].
The relationship between long-term survival after sleeve lobectomy and lymph node involvement remains controversial. Tedder and co-workers [7] reported a 5-year survival rate of 60% when there was no nodal involvement. In the first report from our institution [2], no 5-year survivors were found among patients with positive hilar lymph nodes. In a subsequent study, we [1] found no 10-year survivors among patients with N1 or N2 disease.
Several other reports analyzing long-term survival in relation to lymph node involvement have been published and are summarized in Table 5
. The 5-year survival rate for patients with N1 disease ranges from 0% to 46% and with N2 disease, from 0% to 33%. In contrast to our earlier findings, in the present study with a longer follow-up, we have 10-year survivors among patients with N1 disease. There was a highly significant difference between N0 and N1 or N2 disease but not between N1 and N2 disease.
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In the analysis of cause of death by N category, there was no difference in local recurrence rate, but there was a highly significant difference when comparing distant metastases between N0 and N1 or N2 disease. Mehran and coauthors [4] also found no difference in local recurrence rate between N0 and N1 disease but a highly significant difference between N0 and N2 disease (p < 0.001). In our multivariate analysis, nodal stage was the most significant factor related to long-term survival, both N1 and N2 disease having a definitely negative impact. The causes of death in patients with N1 or N2 disease were mainly distant metastases and combined local recurrence and distant metastases: 54.5% for N1 disease and 71.4% for N2 disease in contrast to 27.3% for N0 disease (see Table 4
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Although we have no data to prove this, we do not think that pneumonectomy instead of sleeve lobectomy would have resulted in better survival for patients with N1 or N2 disease, as most patients die of distant metastases. N1 disease is not a contraindication for sleeve resection, but patients with N1 or N2 disease should be regarded as having systemic disease, and adjuvant treatment should be considered. Recently in Europe, the International Adjuvant Lung Cancer Trial was opened to evaluate adjuvant chemotherapy after curative resection of nonsmall cell lung cancer, mainly to study its impact on long-term survival, local recurrence, and distant metastases.
In conclusion, sleeve lobectomy is a valuable alternative to pneumonectomy in approximately 5% to 8% of patients with operable lung cancer and is mostly performed for centrally located tumors of the upper lobes. Long-term results are influenced chiefly by nodal stage with a significantly lower survival for patients with N1 and N2 disease. As most patients with nodal involvement die of distant metastases, adjuvant treatment should be considered in these instances.
| Acknowledgments |
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| Footnotes |
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| References |
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