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Ann Thorac Surg 1996;62:1489-1493
© 1996 The Society of Thoracic Surgeons
Services de Chirurgie Thoracique and d'Anatomie Pathologique, and Département d'Information Médicale, Hôpitaux Universitaires, Strasbourg, France
Accepted for publication June 9, 1996.
| Abstract |
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Methods. We studied 593 patients who had curative resection between November 1983 and December 1988. We determined the histology, T and N status, peritumoral lung tissue invasion, tumor stroma, necrosis, mitotic rate, and blood vessel invasion.
Results. The median patient survival of the whole series was 3.2 years, with a 5-year survival of 38.9%. In univariate analysis, a high T stage, a high percentage of necrosis, blood vessel invasion, and N stage significantly worsened the survival. In multivariate analysis, only blood vessel invasion and, less significantly, T stage and lymph node metastasis remained independent prognostic factors.
Conclusions. These results highlight the negative prognostic value of blood vessel invasion in nonsmall cell lung cancer and suggest that blood vessel invasion, T stage, and node metastasis are three unrelated and distinctive characteristics of resected nonsmall cell lung cancer.
| Introduction |
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Among the numerous prognostic factors that have been identified in NSCLC, pathologic factors have been little studied except for T and N categories. However, the pathologic features of the primary tumor are the global result of multiple steps on the biologic and cellular level in tumoral growth. Major blood vessel invasion (BVI), for example, needs tumoral growth around the vessels, destruction of vascular walls, and propagation of the tumor into the vascular lumen. Many biologic factors may act during these sequences; for example, metalloproteinases may destroy vascular walls. Surprisingly, large BVI has been studied extensively in only a few cancers [2], but its high prognostic value has been clearly demonstrated. Blood vessel invasion had been studied only in small series of NSCLC and in selected subgroups of patients [35] until the recently published work of Ichinose and colleagues [6].
The aim of our work was to establish the validity of pathologic prognostic factors, including large BVI, necrosis, peritumoral lung tissue invasion, tumor stroma formation, and mitotic rate, in a large series of resected NSCLC. We studied the prognostic value of these factors in relation to the N stage.
| Material and Methods |
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Postoperative adjuvant chemotherapy (six courses of cisplatinum-based regimens) was administered to 35 patients with N2 disease as part of a therapeutic trial. These patients were not excluded from the study because there was no difference in survival between patients receiving chemotherapy and control patients. Postoperative adjuvant radiotherapy was given to 180 patients with N2 disease or with direct tumor extension to the parietal pleura or to the chest wall. It has been shown that adjuvant radiotherapy is effective in preventing local relapses but has no impact on survival [10]. Therefore, these adjuvant treatment modalities should not have influenced our survival analysis.
Pathologic Studies
Macroscopic tumor features were recorded. Conventional light microscopic examination was used to assess the pattern of lung invasion (irregular infiltration or pushing borders), the presence or absence of a tumor stroma, the percentage of necrosis, and the presence or absence of peritumoral or intratumoral BVI [11]. It must be emphasized that we only considered invasion of either the main venous or arterial parabronchial vessels. Tumor sampling was performed perpendicular to the bronchial axis to investigate both the bronchial lumen and the adjacent vessels. At least two sections were needed to specify the relation between the tumor and the parabronchial vessels. Slides were stained with hematoxylin and eosin and, in about 30% of the cases, with elastic van Gieson to permit visualization of the blood vessel lamina in cases of diagnostic doubt about histology. Blood vessel invasion was defined as the presence of neoplastic structures inside the lumen of a vessel with either a totally or a partially recognizable wall. Vascular invasion was recorded as absent when tumor was seen in poorly preserved elastic-walled structures or in the case of medial invasion without intraluminal extension. Blood vessel invasion was nearly always characterized by neoplastic cells embedded in organized vascular thrombosis. In cases of intratumoral vascular thrombosis without evidence of neoplastic cells, serial sections were analyzed to assess a possible neoplastic vascular invasion. In contrast, the presence of a few neoplastic cells in the vascular lumen without thrombosis, which could have represented artifacts of sampling, was not considered BVI until serial sections had demonstrated either vascular wall infiltration or thrombosis. According to these criteria of BVI, the mean external diameter of the concerned vessels was 2 mm (range, 0.4 to 4 mm). The mitotic rate was assessed at 400x objective magnification and was defined as the number of mitoses per 10 high-power fields (area of the microscopic field, 0.196 mm2).
Statistical Analysis
The length of survival was calculated from the date of operation until the date of death or last follow-up. Deaths related to causes other than NSCLC were not excluded from the analysis. The final checkup was done between January 1, 1994 and June 30, 1994, at least 5 years after the inclusion of the last patient. Only 3 patients were lost to follow-up. Most patients were followed up in our outpatient clinic at 3- to 4-month intervals. When patients were surveyed in other centers, medical records were obtained and, if necessary, the primary care physician was contacted by telephone.
Statistical analysis was done with SPSS software (SPSS, Chicago, IL). Survival was estimated by the method of Kaplan and Meier [12]. Univariate analysis was performed using the log-rank test. The Cox proportional hazards stepwise model [13] was used for multivariate analysis. Numbers are expressed as the mean ± standard error of the mean.
| Results |
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| Comment |
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Information about BVI should be added to pathologic reports. Nevertheless, we must emphasize the possibility of interobserver variation, especially in assessing vascular invasion of small blood vessels. Therefore, some authors have advocated either elastic fiber staining or staining techniques using factor VIII or blood group antigens [2]. In our study, we chose to consider only vascular invasion of major, easily identifiable peribronchial vascular channels. The disadvantage of our option was to ignore some cases with BVI (false negatives).
The mechanism of tumor necrosis may occur in poorly vascularized tumors. In the literature, this factor was not found to be prognostic [4].
As in other studies, the mitotic rate was not independently related to survival. This factor, like other factors assessing the proliferative activity of NSCLC (bromodeoxyuridine labeling index, proliferating antigen Ki67), seems better correlated with the time of recurrence [15, 16]. In addition, the presence of a tumor stroma was not a significant factor for survival. However, Nagy and colleagues [19] showed that stroma generation is favored by leaky blood vessels, which might also support BVI.
In conclusion, we assessed the prognostic value of pathologic features related to the primary tumor in resected NSCLC in a large series of patients. The presence of major BVI in the primary tumor is associated with an unfavorable prognosis. In our resected NSCLC cases, BVI appeared to be the second factor independently related to prognosis, after the N stage and before the T stage. Our results suggest that BVI and nodal propagation are two distinctive characteristics of the aggressive behavior of NSCLC.
| Acknowledgments |
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| Footnotes |
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| References |
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