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Eur J Cardiothorac Surg 2002;21:888-893
© 2002 Elsevier Science NL
a Division of Thoracic Surgery, Ospedale Maggiore, Azienda Ospedaliera, P. le Stefani 1, 37128 Verona, Italy
b Department of Medical Oncology, University of Verona and Azienda Ospedaliera, Verona, Italy
Received 30 November 2001; received in revised form 18 January 2002; accepted 31 January 2002.
* Corresponding author. Tel.: +39-45-8072312; fax: +39-45-8072046
e-mail: aterzi{at}tiscalinet.it
| Abstract |
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Key Words: Lung cancer Sleeve lobectomy
| 1. Introduction |
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| 2. Materials and methods |
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Sleeve lobectomy, involved the right upper lobe in 124 cases, the left upper lobe in 19 cases, left lower lobes in ten cases, right upper and middle lobe in four cases and right middle and lower lobe in three cases. It was also performed for peripheral tumors when cancerous invasion of the main bronchus was due to a metastatic N1 node. A functional necessity was present in 36 patients (22.5%), while in 124 patients without respiratory impairment or comorbidity sleeve lobectomy was performed in order to avoid a pneumonectomy. In nine patients (5.6%) an arterioplasty was associated (two arterial sleeve resections and seven tangential arterial resections) and in two patients a chest wall resection was performed. Systematic lymph node dissection was carried out in almost all patients. An incomplete resection was carried out in seven patients (six for R1 on bronchial margin, one for R1 on bronchial margin and R2 on chest wall). Due to the fact that the highest mediastinal lymph node was not routinely sent to pathology separately from the other nodes, we did not take the N factor into consideration to define an incomplete resection. All patients underwent a total and circumferential resection of bronchus. The anastomosis was performed with whole layer interrupted suturing, first with silk, later alternating silk with chromic catgut and then with Vicryl* or PDS*. The anastomosis was routinely covered with a pedicled percardial fat pad or parietal pleura flap. Two patients underwent sleeve lobectomy after induction chemotherapy.
Operative mortality (OM) was taken to include 30 day mortality, all in-hospital mortality beyond 30 days, and mortality at home due to a cause strictly related to the operation, e.g. massive haemopthisis due to bronchovascular fistula. Most patients with pN2 disease underwent radiation therapy on the mediastinum if this was not contraindicated by the respiratory function. The revised TNM staging system was used to stage all patients [5].
Patients were followed up from the date of the operation to the time of death or to the end of observation (December 1999). For patients who were not routinely followed up, data were obtained by personal contact or by contact with the family doctor or relatives. The precise cause of death was not clear in all patients; when it was related to the lung cancer, sometimes it was not clear whether the site of recurrence was local, distant or both. One hundred and fifty-nine patients were evaluated for long-term survival (for statistical analysis, patients lost at follow-up were considered censored), and one patient was excluded because before lung resection she had been treated with radiosurgery for a brain metastasis.
Results are presented as percentages for categorical data. The X2 test was used to compare these proportions. The analysis of survival was based on deaths from all causes including OM and data were evaluated separately for NSCLC and carcinoid tumors. Survival curves were obtained according to the KaplanMeier actuarial method and the logrank test was used to compare survivals. A P value of less than 0.05 was considered significant. Univariate and multivariate analyses were used to identify factors that significantly influenced OM and mortality related to early bronchial anastomosis complications (dehiscence and bronchovascular fistula) in NSCLC patients and for this purpose the series was split into an early (up to 1993) and a contemporary phase (19941999). Variables entered into the model were age, stage, N status, functional status and microscopic residual disease on the bronchus (only for the appearance of early anastomotic complications and related mortality).
| 3. Results |
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Histological examination showed a squamous cell carcinoma in 120 patients, a non-squamous cell carcinoma in 31 patients (adenocarcinoma 27, large cell carcinoma 2, adenosquamous carcinoma 2) and a typical carcinoid in nine patients. According to pTNM classification there were five patients in stage IA, 52 in stage IB, four in stage IIA, 48 in stage IIB, 45 in stage IIIA, five in stage IIIB and one in stage IV. In stage I patients there were 47 squamous cell carcinoma, nine carcinoids and one adenocarcinoma, in stage II 33 squamous cell and 18 non-squamous cell carcinomas, in stage III 40 squamous cell and 11 non-squamous cell carcinomas, in stage IV one adenocarcinoma. Twelve patients were lost at follow-up after a mean time of 39 months.
3.1. Results of sleeve lobectomy for NSCLC, early phase
OM was 14.6% (15/103 patients). Causes of death were bronchopleural fistula in eight cases, bronchovascular fistula in two cases, cardiac in three cases and other in two cases. Mortality rates by age, functional status, stage and N were the following. In patients aged 70 or over mortality was 36% (9/25) while in patients under 70 years it was 7.7% (6/78). In functionally compromised patients the mortality rate was 29% (8/27) while in non-compromised patients it was 9.2% (7/76). Mortality by stage was 8.8% in stage I (3/34), 13.8% in stage II (5/36) and 21% in stage III (7/33); in N0 patients mortality was 14% (6/43), in N1 it was 6% (2/33) and in N2 patients it was 23% (7/30). Univariate analysis did not detect any significant difference in mortality in relation to stage or to N (P=NS) but mortality was significantly higher in patients aged 70 or older compared to patients under 70 (P<0.001), and in patients who were functionally compromised compared with non-compromised patients (P=0.02). Again mortality related to early anastomotic complications was significantly higher in patients aged 70 or over (P=0.02) but in functionally compromised patients the difference failed to reach significance, while no statistically significant difference was detected among stages or N groups (Table 1.).
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3.2. Results of sleeve lobectomy for NSCLC, contemporary phase
OM was 6% (3/48). Causes of death were bronchopleural fistula, bronchovascular fistula and pulmonary embolism. Mortality by age, functional status, stage and N were the following. In patients aged 70 or over mortality was 15% (2/13) while in patients under 70 years it was 3% (1/35). In functionally compromised patients mortality was 11% (1/9) while in non-compromised ones it was 5% (2/39). Mortality by stage was 7% in stage I (1/14), 6.2% in stage II (1/16) and 5.9% in stage III (1/17), 0% in stage IV (0/1); in N0 patients mortality was 11.7% (2/17), in N1 it was 5.5% (1/18) and in N2 it was 0% (0/13). Univariate analysis did not detect any significant difference in mortality in relation to stage, N, age or functional status (P=NS). Again no significant difference was detected for mortality related to early anastomotic complications. Multiple logistic regression analysis was not able to detect any factor significantly influencing OM or mortality related to early anastomotic complications. Non-fatal complications occurred in five patients and there was stroke and wound infection in one patient each and atrial fibrillation in three patients. Late stenosis occurred in one completely resected patient 4 months after a right upper sleeve lobectomy and was treated by dilatation and positioning of a Wallstent.
3.3. Carcinoids
Nine patients underwent a sleeve lobectomy for a typical carcinoid tumor. Their mean age was 39 years (SD 13.3). OM and postoperative complications were nil although operative technique was identical to that used for NSCLC including mediastinal nodes dissection due to the fact that typical and atypical carcinoids cannot be usually identified preoperatively on small biopsy specimens obtained by bronchoscopy. No late stenosis occurred.
The actuarial survival rate was calculated excluding carcinoids (nine cases) and the stage IV patients; for 150 patients it was 51.3% after 3 years, 38.8% after 5 years and 20.5% after 10 years, while for carcinoids it was 100%. Three, 5 and 10-year survival rates for stage I(AB) were 77, 62 and 31%, for stage II(AB) 45, 34 and 27% and for stage III(AB) 33, 22 and 0%. There was no significant difference at logrank test between stages II and III while the difference among stages I and II and III was highly significant (P=0.001) (Fig. 1 ). When survival was analyzed in relation to nodal status, 3, 5 and 10-year survival rates were 71, 57 and 33% for N0 disease, 42, 33 and 22% for N1 disease and 34 and 19% for N2 disease with the last observation of 19% at 82 months. There was no significant difference in survival between N1 and N2 disease but a significant difference was found among N0 and N1 and N2 disease (P<0.001); however, survival curves show a more favorable trend for N1 versus N2 disease and for stage II versus stage III disease (Figs. 12 ). The 5 and 10-year survival rate for carcinoids was 100%. Three out of the seven patients with R1-2 disease are alive, two after radiation therapy and one after completion pneumonectomy. Six patients (4%) had a second primary lung cancer which was resected.
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| 4. Discussion |
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Although the importance of the learning curve cannot be underestimated, neither the suturing technique nor the suturing material have changed since the beginning of the 1980s, and maneuvers to obtain a tension-free anastomosis were always applied when required. OM declined first of all due to improved patient selection and the effort to avoid excessive devascularization by preserving peribronchial vascular tissue in the areas adjacent to the anastomotic sites helped to reduce problems to the anastomosis site with its consequence in terms of mortality and late stenoses. Careful preoperative assessment is crucial; although some authors do not report a higher mortality in patients who are functionally compromised, this was our experience at least in our earlier experience and was also reported by Weisel et al. [14]. It is interesting to note that a low mortality rate was reported in groups of patients with a low percentage of functionally compromised patients and/or N2 patients [15], and this further supports the importance of careful patient selection. Icard et al. [16] reported that no difference in mortality was found between compromised and non-compromised patients, although 41% of their patients were compromised patients, but in most of them a large wedge resection was performed instead of a full bronchial sleeve resection; it may be supposed that preserving a small area of bronchial vascularization may help to avoid bronchial dehiscence and the related high mortality in compromised patients (seven out of nine in our experience).
Since 1994 we have adopted the algorithm proposed by Marshall and Olsen [17] to identify patients at high risk; if patients at risk have comorbidity factors ( poor nutritional status , liver or kidney disease, diabetes, cardiac disease, peripheral vascular disease or previous stroke) and are aged 70 or over we very carefully consider that patient for bronchoplastic surgery. We did not consider clinical N2 disease a contraindication to sleeve lobectomy, but in the past few years we have avoided surgery in patients with clinical N2 who are aged 70 or over and are functionally compromised or have other comorbidity factors; in the other cases of clinical N2 disease, we performed resection after induction chemotherapy.
Bronchovascular and bronchopleural fistulas occurred globally in 7.5% of our patients, a proportion in line with current data. The related mortality was very high in our experience as well as in that reported by others [18,19]; unfortunately, it is not clear whether the high mortality rate reported occurred in compromised patients, as in our case series.
Late stenosis occurred in 7.7% of our patients in the early phase and were related in most cases to granulation tissue formation due to the use of silk as suturing material and occurred only in 2% of cases in the contemporary series of sleeve lobectomies. Stenoses were treated endoscopically by removing granulation tissue and suturing material, by the placement of a stent, or by completion pneumonectomy when the remaining lobe was too damaged or the stenosis was so tight as not to allow the placement of a stent and this happened always on the left side where bronchial calibre is reduced. The actuarial survival rate was in line with data reported by Mountain [5] for the same stage. It should be noted that we considered stages including stages A and B, that is stage IAB, IIAB and IIIAB because the number of patients in some subgroups (that is IA, IIA and IIIB) was quite small. The actuarial survival rate was obtained by excluding patients with carcinoids, for whom the survival rate was 100% at 5 and 10 years, thus confirming Schepens et al.'s [20] report on late results of sleeve resection for typical bronchial carcinoids.
The cause of death in most cases was local/distant or distant recurrence in patients with stage II or III disease while most patients in stage I died of causes other than lung cancer. These data are in contrast with those reported by Tronc et al. [15] but are similar to those reported by Van Schil et al. [21], who showed that most patients with N1N2 disease who underwent sleeve lobectomy died due to distant metastases. A significant difference between stages was found when stage I was compared to stages II and III (P<0.05) but not when stage II was compared with stage III (P=NS).
In conclusion, sleeve lobectomy is a valid alternative to pneumonectomy and leads to better postoperative pulmonary function without any decrease in long-term survival. Careful patient selection makes it possible to achieve an OM rate comparable to or lower than that of pneumonectomy; the benefit of this procedure in terms of quality of life is difficult to measure but is surely appreciated by the patient.
| Footnotes |
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| References |
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