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Ann Thorac Surg 1995;59:863-867
© 1995 The Society of Thoracic Surgeons
Surgical Service and Pathology and Laboratory Medicine Service, John L. McClellan Memorial Veterans Hospital and the University of Arkansas for Medical Sciences, Little Rock, Arkansas
| Abstract |
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| Introduction |
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The incidence of second primary lung cancer (SPLC) ranges from 0.5% to 10% [19]. Despite a recently reported increase, this entity is still relatively rare compared with second primary tumors in other paired organs such as the breast and ovary [1, 10]. The purpose of this report is to detail our experience with SPLC at the Little Rock Veterans Affairs Medical Center over the last 28 years.
| Material and Methods |
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In the case of identical histology at least two of these criteria had to be met. In cases of mixed histology the tumor was classified according to the predominant type. Large cell carcinoma (1 case) was counted under adenocarcinoma. One specimen had to be derived from a potentially curative resection with the exception of 2 patients who had prolonged survival after biopsy and laser treatment in 1 and chemotherapy in the other. Synchronous SPLC was identified if there was radiographic evidence of the second primary tumor at the time of first resection, or if the second primary tumor was discovered incidentally during operation or in the resected specimen. An SPLC discovered later was labeled metachronous. All data were expressed as mean +/- standard error when appropriate. Incidences of events in different groups were compared using the
2 test. Survival data were analyzed using actuarial life-table analysis.
| Results |
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Metachronous SPLCs comprised 39/65 (60%) and synchronous SPLCs 26/65 (40%). A third metachronous tumor was seen in 5 and a third synchronous lesion in 6 patients. Squamous cell carcinoma made up 30/54 (55.7%) of index tumors and 38/65 (58.4%) of SPLCs. Adenocarcinoma was seen in 42.5% of index tumors (23/54) and 20 SPLCs (30.8%); small cell carcinoma arose in 1 index tumor and 7 SPLCs (10.83%). In 1 patient an adenocarcinoma developed 8 years after a peripheral small cell cancer had been resected. The histology of SPLC was the same as that of the index tumor in almost half (33/65). Stage I in the index tumors made up 76%. It comprised 61.1% (33/54) of SPLCs and 72.7% (8/11) of third primaries (Table 1
). By far the most common location of a first and second primary tumor was the left upper lobe, 40.7% and 26%, respectively. The second most common location of SPLC was the left lower lobe. The right upper lobe was the most frequent site of a third primary cancer (Table 2
). The SPLC was on the same side as the index tumor in 53.7% (29/54) and in the same lobe in 13% (7/54). Metachronous lesions were less likely than synchronous lesions to be in the same lung, 13/39 (33.4%) versus 12/26 (46.2%), or in the same lobe, 4/39 (10.2%) versus 4/26 (15.4%).
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2 analysis was used to compare risk of SPLC with type of lung resection conducted for index tumors. There was no significant difference in risk of SPLC between mini-resections and lobectomies. (
2 = 1.035; p = 0.3). The risk after pneumonectomy was, however, significantly lower than after lobectomies or mini-resections (
2 = 5.027; p = 0.025). More than half the resections for SPLCs, metachronous and synchronous, were mini-resections; biopsy only could be accomplished in 30.7% of metachronous lesions and pneumonectomy in 23% of synchronous SPLCs (6/26).
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| Comment |
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The reported incidence has increased steadily, presumably because SPLC has been separated out from recurrence and satellite disease [19]. The striking prevalence of smoking among the patients in our series also has been reported by others [5, 7, 15]. This probably accounts for a continuing high proportion of squamous cell cancers (index and SPLC) in our series. Abbey-Smith and associates [5] and Richardson and colleagues [15] demonstrated the preventive effect of cessation for SPLC. It seems logical that cancerous changes of respiratory epithelium would be multicentric in response to a field effect of carcinogens. Pathologic observations in resected specimens have demonstrated this clearly, and have proved that the incidence of occult SPLC in resected specimens is considerable [1618].
The incidence of SPLC in our series is similar to that in the literature, as are the distribution of metachronous versus synchronous lesions, histologic patterns, stages, and survival figures [3, 4, 7, 12, 1921]. Mini-resections have been used frequently in this institution because elderly veterans have limited pulmonary reserve. However, mini-resection did not predispose our patients to higher rates of SPLC compared with lobectomies. A lesser resection on the first occasion would leave the patient with more lung tissue to resect should a second primary develop later. Pneumonectomy was found to decrease the chance of an SPLC significantly; presumably by eliminating ipsilateral metachronous lesions, which otherwise account for about half the incidence. Pneumonectomy was more common among patients with synchronous lesions because it was preferred when two separate cancers arose in the same lung. Biopsy only was used in advanced stages.
The survival advantage of metachronous compared with synchronous lesions also has been reported by others [12, 22, 23]. This difference persists even when resected lesions are considered separately. Others also have shown that survival improves as the interval between index and metachronous tumors increases [19]. The inferior survival rate of SPLC compared with first primary cancers might be related to understaging because of technical difficulties during the second or third procedure and to resorting to lesser resections because of limited pulmonary reserve. Further, a third of these SPLCs overall were unfit for anything more than biopsy. Survival rates, however, after SPLC still remain higher than those reported after recurrence [13].
More than 90% of the cases in our institution were detected within the last 8 years. The introduction of chest computed tomography in 1983 increased awareness of this entity; a more aggressive attitude toward any change in symptomatology, radiology, or cytology also is responsible. Our use of ultrastructural, histochemical, and DNA flow cytometry techniques helped to differentiate SPLCs from recurrences when Martini and Melamed's criteria were inconclusive. Others also have used these modalities [9, 24, 25]. The question of whether a newly discovered lung lesion after curative resection is actually an SPLC or a recurrence remains a theoretical one. We follow the policy of thoroughly restaging all such lesions and operating with the intention to cure whenever possible.
We conclude that SPLC is frequent in long-term survivors after curative resections. A high level of awareness and the use of computed tomography scan allow their early detection. Mini-resections have not been found to increase the risk of SPLC, and they may be preferred in patients with limited lung tissue reserve. Follow-up after lung resection should be for life because SPLC incidence increases in long-term survivors after curative resection of index or second primary lung cancer. We perform chest roentgenography and thorough clinical evaluation on each visit, and in the presence of any abnormality follow with computed tomographic scan and sputum cytology, bronchoscopy, or both. Smoking cessation should be stressed. Second primary lung cancers should be treated aggressively as the survival rate after resection of metachronous lesions is better than that after recurrence.
| Footnotes |
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Address reprint requests to Dr Read, Surgical Service (112 LR), John L. McClellan Memorial Veterans Hospital, University of Arkansas for Medical Sciences, 4300 W 7th St, Little Rock, AR 72205.
| References |
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