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J Thorac Cardiovasc Surg 1999;118:702-709
© 1999 Mosby, Inc.
GENERAL THORACIC SURGERY |
From the Thoracic Surgery and Pathology Departments, Massachusetts General Hospital, Boston, Mass.
Address for reprints: Douglas J. Mathisen, MD, Thoracic Surgery, Blake 1570, Massachusetts General Hospital, Fruit St, Boston, MA 02114.
| Abstract |
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| Introduction |
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There have been claims of correlation between certain clinical, radiographic, and pathologic findings and survival.
6-8 Some researchers have claimed a predilection for BAC in women and no correlation to cigarette smoking. Because of these claims with conflicting reports, we reviewed our experience with BAC to see whether we could corroborate or refute some of these claims.
| Methods |
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All chest radiologic findings were reviewed to determine the characteristics because computed tomography scans were not available for all patients during the period of study. Radiographic lesions were classified according to the presence of a mass or infiltrate. The lesion was considered an infiltrate when it was a poorly delineated opacity without defined borders. The infiltrative lesions were subclassified according to unilateral or bilateral, and within one or more lobes. The mass lesions were subclassified as single or multiple, and larger or smaller than 3 cm, if single.
All solitary neoplasms were postoperatively staged according to the current International TNM Classification System for Lung Cancer.
9 When multiple lesions were resected, the patients were separated simply as unilateral or bilateral. Gross and microscopic pathologic features were studied. Grossly, the tumors were characterized according to the following features: solitary, diffuse, or multifocal; well-defined nodule, ill-defined single mass, or pneumonic. Microscopically, 8 features were evaluated: tumor border (sharp, ill defined, mixed); aerogenous spread (yes or no); subtype of adenocarcinoma (acinar, papillary, bronchoalveolar, and the percent calculated accordingly); pattern (mucinous, mucinous-sclerosing, nonmucinous, nonmucinous-sclerosing); cell type (type II pneumocyte, Clara cell, colonic mucinous, endocervical mucinous, or mixed); nuclear grade (well differentiated, moderately differentiated, poorly differentiated); mitotic activity (number per 10 high-power fields); and the degree of lymphocytic inflammation (quantitating from 0 through 3).
Clinical features of sex, symptoms, and smoking status were analyzed for the incidence of disease. The relationship between clinical, radiologic, and pathologic findings were examined. Symptoms, smoking status, the presence of a mass or infiltrate, mucinous or nonmucinous, sclerosing or nonsclerosing, and the percent of BAC cells were chosen and examined for the relation to each other. Factors were then analyzed according to their impact on survival.
Statistics.
The survival analysis was estimated by the Kaplan-Meier actuarial method,
10 with the date of initial operation as the starting date. The difference of variables on survival was analyzed with the log-rank rest for cosorted data.
11 Qualitative data were analyzed with
2 tests. Cox multivariate analysis was used to evaluate all factors. All reported P values are 2-tailed.
| Results |
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Radiologic findings.
Chest radiographs showed a mass lesion in 94 patients and infiltrating lesion in 25 patients. Among mass lesions, a single lesion was present in 80 patients (
3 cm in 58 patients and >3 cm in 22 patients). Multiple lesions were present in 14 patients (unilateral in 10 patients and bilateral in 4 patients). Among infiltrating lesions, 15 patients had unilateral lesions and 10 patients had bilateral lesions.
Method of diagnosis.
The diagnosis of malignancy was made by sputum cytologic evaluation in 4 patients, bronchoscopic examination in 12 patients, needle aspiration biopsy in 40 patients, prior brain surgical procedure in 1 patient, and surgical resection in 62 patients.
Operative procedure.
One hundred seven patients underwent surgical resection; 7 patients had open lung biopsies, and 5 patients had transbronchial biopsy only. Five patients underwent multiple surgical procedures for tumor recurrence. The operative procedure for the first, second, or subsequent resections are shown in Table I. The most common procedure was lobectomy (64%, first surgical procedure).
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Pathologic findings.
One hundred two first-time surgical procedures were considered curative. Five patients did not undergo curative resections because of tumor at the resection margins on histologic examination. There were 11 reoperations in 5 patients; 8 were deemed curative. Of the 5 patients undergoing multiple operations, 3 patients had similar pathologic findings as the first operation, and 2 patients had different findings. The pathologic findings are listed in Table II. Findings of aerogenous spreading were seen in 113 of 119 patients. Most of the tumors in this series did not show signs of mucin production (82/119 tumors). Most of the tumors had evidence of sclerosis present or were associated with the presence of a scar. The most common cell type seen was the Clara cell. Other cells identified included endocervical mucinous, type II pneumocyte, or colonic mucinous cells. Approximately 29% of tumors had a mixture of different types of cells present. A pure bronchoalveolar cell pattern was seen in only 17 of 119 patients. Most tumors were a mixture of bronchoalveolar cell carcinoma and adenocarcinoma with percentages of BAC ranging from 50% to 90%. Most tumors were graded as moderately differentiated (83/119 tumors) with comparable numbers of well and poorly differentiated tumors. Sixty-eight patients had no mitotic activity seen on 10 high-power microscopic examinations; 41 patients had only 1 mitosis seen per 10 high-power fields, and 7 patients had 2 or more mitoses per 10 high-power fields. A qualitative assessment was made of the presence of lymphocyte infiltration into the tumors. Eighty-five patients had grade 0 to 2 lymphocyte infiltration, and 22 of 119 patients had grade 3 lymphocyte infiltration.
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Correlations among clinical, radiographic, and pathologic findings.
Symptomatic patients (76%) more often had infiltrative radiographic features, and asymptomatic patients more often had mass lesions (84%; P < .0001). There was no correlation between smoking status and radiographic findings (Table IV). Infiltrative radiologic findings correlated with mucinous histologic findings (P = .0060), and mass lesions correlated with nonmucinous histologic findings and the presence of sclerosis (P = .0032). The pathologic finding of 100% BAC correlated with nonsmokers and infiltrative lesions. No other significant correlations existed among the other clinical, radiologic, or pathologic factors.
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years. All the patients undergoing multiple operations survived more than 50 months after the initial operation. The existence of malignant cells in the resected margin correlated with a poor prognosis (P < .01; Fig 2). The survival according to operative procedure is seen in Fig 3. Segmentectomy showed a statistically significant better prognosis than wedge resection (P = .022). The factors affecting survival by univariate analysis (Table V) were radiographic findings of mass or infiltrate (Fig 4), nodal involvement, pathologic findings of sclerosis, and association with scar. The percent of BAC (Fig 5) showed a significant difference in survival; 100% presence of BAC showed a worse prognosis than tumors with a mixture of BAC and adenocarcinoma (P < .05). The grade of lymphocyte infiltration (Fig 6) showed significant differences in survival. Patients with grade 3 lymphocyte infiltration had a better prognosis than those with grade 0, 1, or 2 (P < .01). Multivariate analysis showed that nodal involvement and the radiologic finding of an infiltrative process had a negative impact on survival and that the presence of a mass lesion had a positive impact on survival.
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| Discussion |
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In our series, we found a nearly 2:1 ratio of women to men. This has been reported by others but not all authors.
4,12,13,15 Because most of our patients had solitary pulmonary nodules, nearly 72% were asymptomatic. Of these patients having symptoms, 56% had evidence of infiltrative lesions on radiographs. Sixty-eight percent of the patients in our series were smokers, but this did not have an impact on survival.
The most common operation in our series was lobectomy. Some of the neoplasms were more advanced and required more extensive procedures. Small peripheral lesions were managed by lobectomy, segmentectomy, or wedge resection. There was a statistically significant difference in survival between segmentectomy and wedge resection. Because of the patterns of spread of BAC along alveolar walls and by aerogenous routes, it should be recommended that lobectomy or segmentectomy is preferable for small peripheral neoplasms.
The most common cell type seen was the Clara cell. Other cell types or mixture of cells were identified. This suggests a multiclonal origin of this tumor. The pattern of multiple cells of origin argues that multiple separate independent primary tumors occur in contiguous foci. This may explain the differences in histologic evidence seen in some of the recurrent tumors and the frequently observed admixture with typical findings of adenocarcinoma.
14-16 A pure BAC pattern was seen in only 17 of 119 patients, correlating with an infiltrative pattern on radiograph. This small subset of patients correlated with a worse prognosis than those patients with other percentages of BAC. Most patients in this series showed histologic signs of sclerosis in the presence of a scar, and most were nonmucinous as well. This has been reported by others.
6 The presence of sclerosis and a scar had a positive correlation with survival, but no impact on survival was found among those tumors that showed signs of mucin production contrary to what others have reported.
6,17 The differences in pulmonic involvement in neoplasms with mucinous, nonmucinous, and sclerosis present histologically are reported to be due to differences in basement membrane integrity and type IV collagenase activity, which destroys the basement membrane and facilitates the spread of tumor through the lymphatic duct.
18 The other interesting histologic finding was the positive correlation between grade 3 lymphocyte infiltration and survival. Whether this finding implies a beneficial host immunologic reaction to the tumor is purely speculation. Further evaluation of this finding is warranted.
The overwhelming majority of our patients had stage I or II neoplasms that represented solitary nodules. This accounts for the 5- and 10-year survival figures of 69% and 56%, respectively, in patients undergoing surgical resection. It was important to achieve complete surgical resection. The 5-year survival for completely resected patients was 71% and only 20% for incomplete resections (1/5 patients; P < .01). Positive hilar or mediastinal lymph nodes occurred in only 10% of our patients but was a statistically significant factor adversely affecting survival.
Overall, we were able to develop a favorable profile for patients with BAC. Patients that had no symptoms and a mass lesion on chest radiograph have a better prognosis. Conversely, those patients with an infiltrative picture and symptoms had a worse prognosis. Histologically, the presence of sclerosis and a scar, abundant infiltration with lymphocytes, and no evidence of lymph node metastases are associated with a more favorable prognosis. Patients undergoing complete surgical resection with these findings have a good prognosis.
| Appendix: Discussion |
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Until this technologic breakthrough occurs, we will have to rely on retrospective reviews such as this to learn about this disease. This article has many similarities to a paper presented at the meeting of the Southern Thoracic Surgical Association in 1990 by Dr Richard Daly from our own institution.
The demographics of the patients with BAC are very similar in the 2 reports; most had a single nodule and were asymptomatic. The operation most commonly performed is a lobectomy, and the mortality rate is quite low. A high percentage of the patients have stage I disease, and their survival is quite good compared with the average patient with bronchogenic carcinoma.
I have 3 questions. In our series we had quite a few patients who had recurrence after 5 years. What is your recommendation for follow-up of this group of patients? Do you obtain a periodic computed axial tomographic scan or do you obtain periodic chest x-ray films only? Do you use sputum cytologic findings in any way to observe these patients?
My second question concerns patients who have a mass on one side that is diagnosed as BAC but have infiltrative lesions on the other side. Do you recommend resecting the larger lesion first and closely monitoring the contralateral lesion, or do you try and diagnose the smaller contralateral lesions first?
Finally, do you think that this is a multicentric disease or do you think that, in patients who have multiple sites, they all originated from one focus?
Dr Okubo. With respect to the third question, I think the tumor is multicentric because of the variety of cell types, including Clara cell, type II pneumocyte. This neoplasm shows a variety of mixed cell types, so I think it is multicentric.
With respect to the second question, we individualize the management of bilateral lesions. If the presence of contralateral disease would contraindicate surgical procedures, we would perform a biopsy of it first. For other reasons we might monitor them or resect at a later date.
Usually postoperative follow-up is done with chest x-ray films and computed axial tomography scans. So, this should be done for follow-up. We have not found sputum cytologic evidence to be useful.
Dr Nasser K. Altorki (New York, NY). I am always troubled by the patient who has a diffuse lobar infiltrate and a diagnosis of BAC. Can you tell me, now knowing what you know about this series, what your strategy has been or will be in the treatment of those patients? Is this a surgical disease?
Dr Okubo. As long as this neoplasm spreads unilaterally, this is a surgical disease. The diffuse infiltrative lesions tend to have a worse prognosis, but they tend to respond poorly to radiation or chemotherapy. There are some patients who have bronchiolar and diffuse disease who should undergo a resection to control symptoms.
Dr Lawrence R. Kaiser (Philadelphia, Pa). Just to follow up on that, how many of the patients in this series who had lobar infiltrates underwent resection, and were any of those patients long-term survivors? The issue of the multicentricity of these lesions is an interesting one. In talking with Rob Garver, who is one of the pulmonologists at the University of Alabama, I believe they have performed transplantations in 7 patients with BAC. Two of those patients have experienced the development of BAC in the transplanted lungs, and they are currently looking to see whether that is of donor or recipient origin.
Are there any long-term survivors with resected lobar infiltrates?
Dr Okubo. Fourteen of 25 infiltrate regions on radiography underwent resections, with a 5-year survival of 30% to 40%; but these were not the patients with lobar or an entire lung involved. The diffuse, extensive infiltrative lesions are associated with a much worse prognosis.
| Footnotes |
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| References |
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