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Eur J Cardiothorac Surg 2003;24:1013-1018
© 2003 Elsevier Science NL
a Department of Pulmonology, Sint Antonius Hospital, PO BOX 2500, 3430 EM Nieuwegein, The Netherlands
b Department of Cardio-Thoracic Surgery, University Medical Center, Utrecht, The Netherlands
c Department of Thoracic Surgery, Sint Antonius Hospital, PO BOX 2500, 3430 EM Nieuwegein, The Netherlands
d Department of Pulmonary Diseases, University Medical Center, Utrecht, The Netherlands
Received 7 April 2003; received in revised form 11 July 2003; accepted 23 July 2003.
* Corresponding author. Tel.: +31-30-6092428; fax: +31-30-6052001
e-mail: j.vandenbosch{at}antonius.net
| Abstract |
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Key Words: Lung cancer Surgery Survival
| 1. Introduction |
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The present report is a retrospective analysis of survival characteristics in 89 patients who underwent resection for T4 tumors with invasion of the mediastinum, recurrent nerve, heart, great vessels, trachea, esophagus, vertebral body and carina or with a malignant pleural effusion.
| 2. Materials and methods |
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Patient characteristics are shown in Table 1. Cervical mediastinoscopy was negative in 81 patients (91.0%), not performed in one patient (1.1%) and positive in seven patients (7.9%). These seven patients were operated because they only had one single positive lymph node at the ipsilateral tracheobronchial angle (n=4), or, because they were relatively young (46 and 51 years). In one patient the reason for thoracotomy could not be assessed retrospectively. One patient was pre-operatively diagnosed at bronchoscopy as having a carcinosarcoma in the main right bronchus. No cervical mediastinoscopy was performed. Frozen sections peroperatively showed a squamous cell carcinoma.
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All patients were staged as T4 because of involvement of the mediastinum, recurrent nerve, heart, great vessels, trachea, esophagus, vertebral body, or carina, or the presence of malignant pleural effusion (Table 3). Invasion of the different great vessels and pTNM staging are shown in Tables 4 and 5.
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Four patients (4.5%) received postoperative chemotherapy because of incomplete resection.
Follow-up was completed as of August 2002. Follow-up data were obtained from hospital files and from questionnaires to referring pulmonary physicians and general practitioners. Follow-up about local recurrence and distant metastases was obtained in 96.6% of the patients.
Survival was estimated from the date of operation, using the KaplanMeier survival analysis method [11]. Hospital deaths were excluded. Survival comparisons were analyzed by the log rank test [12]. The difference was considered statistically significant when the P value was less than 0.05. Incremental risk factors affecting survival were evaluated using Cox's proportional hazards model [13].
| 3. Results |
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Mean 5-year survival was 19.1% for all patients (n=89) and 23.6% for hospital survivors (n=72).
Complete resection was performed in 26 hospital survivors (36.1%) with a mean 5-year survival of 46.2%. The remaining 46 hospital survivors underwent an incomplete resection with a mean 5-year survival of 10.9% (P=0.0009) (Fig. 1) . Because of this significant difference in survival between patients with complete and incomplete resection, only the results of hospital survivors with complete resection were studied for the analysis of other prognostic factors.
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Regarding the T status, mean 5-year survival for patients with invasion of great vessels (n=14) was 35.7%, whereas mean 5-year survival for patients with invasion of other structures (n=12) was 58.3% (P=0.03) (Fig. 2) . Although patients with involvement of the carina or the trachea had a better mean 5-year survival (50.0%) than involvement of other structures (44.4%), the difference was not statistically significant.
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Mean 5-year survival for patients who underwent a pneumonectomy (n=23) was 43.5%, and for patients post lobectomy (n=3) 66.7% (P>0.05). Age and postoperative radiotherapy did not influence survival significantly.
According to the multivariate analysis regarding age, sex, pTNM classification, histology and localization no significant prognostic factors were found in the group of patients with complete resection.
Distant metastases developed in four of 26 hospital survivors with complete resection (15.4%), and one patient had a local recurrence (3.8%). Three patients had combined local and distant recurrence (11.5%).
| 4. Discussion |
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Hospital mortality varied between 5% and 20%, increasing after extended resections [15,16]. Our study also shows a substantial hospital mortality of 19.1%. Hospital mortality was related to invasion of the great vessels. Thirteen of 17 hospital deaths had tumor involvement of the aorta, superior vena cava or pulmonary veins. In this subset hospital mortality was 21.3% (13/61).
Resectability of a tumor is influenced by pTNM staging. Our results of surgical treatment of T3 tumors with invasion of the chest wall, or with invasion of the mediastinal structures and/or localization in the main bronchus showed that complete resection was possible in 68.8% and 64.8%, respectively [2,3].
In T4 tumors, localization and invasion of adjacent structures often make complete resection impossible. A complete resection is vital [6,15]. In our series, mean 5-year survival for complete resections was 46.2%, for incomplete resections 10.9% (P<0.05).
A complete resection could be performed in 34 patients (38.2%). This is higher than described by Martini et al. who had a complete resection rate of 18%. In that study none of the tumors invading the aorta, trachea or spine were resected [6]. However, other studies reported complete resection rates of 72% and 80%, respectively, for tumors invading great vessels or the carina [10,17]. Based on resectability criteria, Grunenwald divided stage IIIB tumors in two subcategories: potentially resectable (invasion of superior vena cava, carina, lower trachea, left atrium) and definitively non-resectable (malignant pleural effusion, invasion of the esophagus and vertebrae) [18]. Our study supports this classification.
In the past, high post-operative morbidity and mortality and uncertain long-term survival have been associated with carinal surgery for bronchogenic carcinoma [19]. Respiratory failure after non-cardiogenic pulmonary edema or infection in the remaining lung and anastomotic dehiscence with bronchial fistula were the major postoperative problems and the main cause of the high operative mortality, varying from 11 to 27% in large series [8]. However, careful patient selection, much attention to surgical details and careful anesthetic management can lower the levels of surgical deaths. Recently, a postoperative mortality of 6.615% has been reported and pneumonectomy with tracheal sleeve resection is advocated by several surgeons with 5-year survival approaching 43% [7,16]. In our study, complete resection of tumors with invasion of the trachea or carina was 37.5% and 36.4%, respectively, while it was less for tumors with invasion of other structures and it had a favorable prognosis with a mean 5-year survival of 50.9%.
Results of surgery for T4 tumors with invasion of the left atrium or great vessels are poor. Burt et al. reported no 5-year survivors in their series of 18 patients after resection for tumors extending into the vena cava superior [14], while Tsuchiya et al. found only two of 101 patients alive after 5 years [9]. However, recent advances in cardiovascular surgery offer possibilities for complete resection in cases of invasion of the great vessels, like aorta and superior vena cava [10,15]. Spaggiari et al. reported extended resections for tumors invading the superior vena cava with 5-year actuarial survival of 29%, with four of 25 patients alive at 5 years [10]. Hospital mortality was 12%, and a complete resection was achieved in 20 patients (i.e. 80%). This is high, but Doddoli et al. described the same results for completeness of resection and survival [17]. In our study 37.7% of the patients with invasion of the great vessels had a complete resection (n=14). This conforms with the results of Fukuse et al. [15]. There was no difference in completeness of resection between invasion of the aorta, superior vena cava and pulmonary vein. The results of complete resection in the group with invasion of the pulmonary artery were better, but this was a very small group. Mean 5-year survival was 35.7%.
Traditionally, tumors invading vertebrae were considered as unresectable. We had no complete resection in both patients with involvement of the vertebral body. However, recent progress in spinal surgery has opened new possibilities. Induction treatment with total or partial vertebrectomy and pulmonary resection is feasible in selected patients with an estimated 5-year survival of 14% [20].
In most studies involvement of the esophagus precludes a complete resection [6,21]. We achieved a complete resection in three patients (25%), as only the muscular layer of the esophagus was involved by the tumor.
Regarding lymph node involvement, mean 5-year survival was worse for N0 patients than for N1 and N2 patients. This finding is contradictory to our previous studies [2,3] in which mediastinal lymph node involvement worsens the prognosis. All three N0 patients in this series, however, had involvement of great vessels or the heart. Invasion of these structures carries a worse prognosis [6]. In the group of 16 N1 and seven N2 patients involvement of great vessels or the heart was present in nine and five patients, respectively. The remaining patients had involvement of the trachea (n=8), carina (n=4), mediastinum (n=4) or esophagus (n=3). Izbicki et al. also found no statistical significant differences in survival related to lymph node status in T4 tumors [22]. In their study, mean 3-year survival for six T4N0, seven T4N1 and 12 T4N2 patients was 0%, 53% and 16.6%, respectively. This suggests that in T4 tumors local invasion of surrounding structures may be more important for survival than lymph node involvement. But in both studies the number of patients is limited and other studies reported no long-term survivors in patients with T4N2 tumors [6,15,21].
Because of the poor results of surgical resection alone, multimodality treatment has surfaced as the treatment of choice in patients with stage III NSCLC [23]. However, it is still unclear which treatment modality (surgery, radiotherapy or a combination of both) will result in prolonged survival after neo-adjuvant chemotherapy. Recently, several trials have been conducted showing that some locally advanced, initially unresectable tumors become operable after induction chemotherapy [24,25].
Given our own results, and those reported by others [18,19,22] for patients presenting with T4 pathology, pre-operative work-up should establish the possibilities of complete resection using complete available modern imaging technology. If complete resection with appropriate reconstruction, is feasible, all patients, otherwise fit for surgery, should be operated on. Complete resection resulting in good mean 5-year survival is possible, especially for tumors invading the trachea or carina. Tumors with invasion of the esophagus, vertebrae and with malignant pleural effusion appear to be unresectable in most cases. The results of induction chemotherapy make us propose that presently multimodality treatment offers new possibilities to treat patients with T4 disease and a good performance status.
| Acknowledgments |
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| References |
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