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Ann Thorac Surg 2003;76:1782-1788
© 2003 The Society of Thoracic Surgeons
a Department of Surgery, The University of Chicago, Chicago, Illinois, USA
Accepted for publication June 3, 2003.
* Address reprint requests to Dr Ferguson, Department of Surgery, The University of Chicago, 5841 S. Maryland Ave, MC5035, Chicago, IL60637, USA.
e-mail: mferguso{at}surgery.bsd.uchicago.edu
| Abstract |
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METHODS: We performed a meta-analysis of results of sleeve lobectomy and pneumonectomy published in English from 1990 to 2003. A decision model was developed with 5-year survival, quality-adjusted life years (QALY), and cost effectiveness as the outcomes, and sensitivity analyses were performed.
RESULTS: The model favored sleeve lobectomy (3.5 percentage point survival advantage) when the reward was 5-year survival; the results were influenced primarily by the 5-year survival rates for patients who did not develop recurrent cancer. Sleeve lobectomy was strongly favored when the reward was QALY (1.53 QALY advantage). Sleeve lobectomy was more cost effective than pneumonectomy, and had an incremental cost effectiveness ratio of $1,300/QALY.
CONCLUSIONS: In patients with anatomically appropriate early-stage lung cancer, sleeve lobectomy offers better long-term survival and quality of life than does pneumonectomy and is more cost effective.
| Introduction |
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Several recent studies suggest that sleeve resection should be used routinely in the management of patients with anatomically appropriate centrally located tumors, even in patients with sufficient pulmonary reserve to permit pneumonectomy [36]. The reports contend that local recurrence is not an important issue, that long-term survival is similar to or better than after pneumonectomy, and that quality of life is better than after pneumonectomy. Unfortunately, stage distribution between the two techniques is significantly different in most reports, and careful comparisons between the techniques regarding survival and local recurrence rates with appropriate stage stratification have not been performed. In addition, no formal information is available in these reports regarding quality of life after the two types of operations.
We elected to study the role of sleeve resection compared with pneumonectomy in patients with early-stage nonsmall cell lung cancer using decision analysis techniques. This methodology lends itself to the analysis of multiple disparate published results and permits comparisons of outcomes using a number of different end points, or rewards, such as survival and cost effectiveness. We sought to determine whether sleeve lobectomy or pneumonectomy offers better survival and quality-adjusted survival and which procedure is more cost effective for patients with early-stage nonsmall cell lung cancer.
| Material and methods |
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Meta-analyses of the resultant data were performed to produce estimates for appropriate nodes of the decision model. Survival within each study was calculated assuming an equal distribution of stage I and stage II patients to correct for the dissimilar distributions of these stages between sleeve lobectomy and pneumonectomy series. Cost information for surgery was obtained from data collected on 100 patients who underwent thoracotomy for lung resection at the University of Chicago Medical Center 1998 to 2001 under a protocol that was approved by the Institutional Review Board and for which specific patient consent was not required. Costs were prorated for the type of procedure based on mean duration of hospitalization. Costs for other therapies were abstracted from recent literature. All costs were normalized to 2002 dollars using the Consumer Price Index conversion factor. Estimates for other parameters, including survival after recurrent disease and quality of life estimates, were derived from studies published during the same time interval. Isolated local/regional recurrence was defined as recurrence of the original cancer in the bronchus, peribronchial soft tissues, or ipsilateral hilar or mediastinal lymph nodes in order to focus on the differing risks for isolated local recurrence that were procedure dependent. Other patterns of recurrence, including those in the ipsilateral hemithorax, in distant sites, or any local/regional recurrence that was accompanied by a recurrence in another site, were classified as other recurrences. Appropriate ranges were inserted into the model based on 95% confidence intervals (CI) where available or on estimates when necessary.
The model was constructed using a dichotomous choice between sleeve lobectomy and pneumonectomy for patients with stage I and stage II disease (Fig 1). The model assumed that isolated local recurrences after sleeve lobectomy could be treated in a variety of ways including re-resection (completion pneumonectomy), whereas isolated local recurrences after pneumonectomy could not be treated by further resection. Other recurrences were assumed to be managed with either chemotherapy alone or with a combination of chemotherapy and radiation therapy. Survival after recurrence was assumed to be related to the type of recurrence and whether re-resection could be performed for an isolated local recurrence.
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| Results |
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| Comment |
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Initial efforts at parenchyma-sparing operations such as sleeve lobectomy focused on patients with limited pulmonary reserve who were not candidates for pneumonectomy. Based on a favorable experience with such patients, the indications for such procedures expanded to include patients with anatomically favorable tumors regardless of their preoperative pulmonary status. The theory was that preservation of lung parenchyma was likely to reduce the risks of operative mortality and should improve functional capacity and possibly quality of life in the long term.
The trade-offs for these benefits include a theoretical increase in the risk of several problems: anastomotic complications such as dehiscence, vascular fistula, and stenosis, leading to an increase in costs; local/regional recurrence of the original cancer; and new primary lung cancer. Local/regional recurrence comprises several entities, including anastomotic or bronchial stump recurrence, local nodal recurrence, and regional nodal recurrence. The risk of the first two of these may be increased after sleeve lobectomy because less peribronchial soft tissue is removed and two bronchial resection margins exist as compared with one after pneumonectomy. The risk of developing a second primary lung cancer is increased because of the increased amount of remaining pulmonary parenchyma after lung conservation surgery. The risk of a new primary lung cancer after lobectomy is estimated at between 1% and 2% annually [2931]. Theoretically, this risk is reduced by one-third after pneumonectomy because of the lesser amount of remaining parenchyma.
These factors have led to some controversy about the relative benefits of parenchyma-sparing operations in patients with good pulmonary reserve. There are ardent advocates for sleeve lobectomy. In contrast, few surgeons recommend the routine use of pneumonectomy, but apply this technique in exceptional situations in which standard lobectomy or bilobectomy is not an option. Comparisons between the two techniques have been hampered by limited reporting of outcomes for each and by differences in stage distribution among the patients undergoing each procedure.
Our review of the recent published literature was able to address some of these issues. Although the results did not differ significantly, operative mortality was confirmed to be somewhat higher after pneumonectomy than after sleeve lobectomy, giving some support to the contention that sleeve lobectomy is a safer operation in the hands of experienced surgeons. Importantly, isolated local/regional recurrence rates were substantially higher after sleeve lobectomy than after pneumonectomy, whereas other recurrence rates did not differ between the two operations. Despite this fact, 5-year survival rates were similar for the two operations when corrections for stage distribution were calculated. Use of 5-year survival as an outcome in the decision model slightly favored sleeve lobectomy over pneumonectomy for managing stage I and II nonsmall cell lung cancer.
The similarity in 5-year survival rates for the two procedures suggests that pneumonectomy patients die more often of intercurrent disease than do sleeve lobectomy patients, raising concerns about long-term risks of fatal cardiopulmonary limitations in these patients. Quantifying the risk of cardiopulmonary limitation after pneumonectomy is difficult. It has been known for more than half a century that some patients have substantial functional decrements, although they often continue to report quite satisfactory global quality of life (QOL) [3236]. Two recent reports suggest that QOL may be related to the amount of lung resected, as judged by the type of operation or by estimated postoperative diffusing capacity [33, 35]. Use of these QOL estimates in the calculation of QALY as an outcome shifted the outcome strongly in favor of sleeve lobectomy for the management of these patients.
There are limited data regarding QOL after major lung resection. The data that are available are not consistent in the degree of return of functional capacity, the time necessary to reach a functional plateau postoperatively, the relationship between functional capacity and overall perceived quality of life, or the level of perceived QOL long term postoperatively. Each of these values is vital in the estimation of QALY-related outcomes after major lung resection. It is important that additional prospective efforts at evaluating QOL outcomes after thoracic surgery be undertaken.
Our analysis demonstrated that sleeve lobectomy was more cost effective than pneumonectomy. The calculation was somewhat trivial owing to the small increment in costs accompanying sleeve lobectomy and the large increase in QALY that attends that procedure. The results demonstrate that the incremental cost effectiveness ratio was well within the commonly accepted willingness-to-pay threshold [44].
One possible concern regarding this study design was the comparison of patients in the sleeve lobectomy group who might not have tolerated pneumonectomy to patients in the pneumonectomy group, who presumably had better cardiopulmonary function. Overall, survival and cost effectiveness outcomes were superior for sleeve lobectomy, even though those patients were, on average, less able to tolerate pneumonectomy and presumably had worse baseline cardiopulmonary function and predicted long-term survival as a result. Because the bias was against sleeve lobectomy and the results were strongly in favor of this operation, this should not be a major issue in interpreting the results.
Our findings suggest that performance of a sleeve lobectomy rather than a pneumonectomy for patients who are anatomically appropriate, regardless of underlying cardiopulmonary status, provides an overall survival and QOL advantage. Reasons for this likely include the relatively low overall risk of isolated local/regional recurrence after either operation and improved postoperative cardiopulmonary status after sleeve lobectomy owing to preservation of lung parenchyma. Our calculations were performed using data derived from limited retrospective studies. The use of large volumes of prospectively collected data, such as may become available with the advent of the Society of Thoracic Surgeons General Thoracic Surgery Database, will be invaluable in refining estimates of benefit for either of these operations.
| Acknowledgments |
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| References |
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