Prognosis of patients with metastatic melanoma is poor (Ketcham and Balch, 1985;Tafra et al, 1995), with an annual risk of death of about 20% during the first 3 years (Slingluff et al, 1992). The second most common site for metastatic spread is the lung (Balch and Milton, 1985), and the annual probability of developing pulmonary metastases increases progressively from 10% at 5 years to 17% at 15 years. Overall long-term survival for such patients is poor, with only 4% of patients alive at 4 years (Harpole et al, 1992).As effective chemotherapy for metastatic melanoma is not available, surgery can represent the only prospect of cure for highly selected patients (Wong et al, 1993;Karakousis et al, 1994). However only 10-12% of cases are suitable for surgery with curative intent (Cahan, 1973;Mountain et al, 1984;Thayer and Overholt, 1985;Pogrebniak et al, 1988;Gorenstein et al, 1991). Moreover, surgical results are still controversial as the majority of published studies are based on a small number of cases with relatively short follow-up.Two large series have already confirmed the prognostic value of factors such as radicality, number of resected metastases and disease-free interval (DFI) after pulmonary metastasectomy (Harpole et al, 1992;Tafra et al, 1995) but it remains unclear how these data can be used for preoperative patient selection.The purpose of this study is to evaluate the long-term results of surgery in melanoma pulmonary metastases from the International Registry of Lung Metastases (IRLM) data, with the aim of defining the subset of patients that really benefit from surgery.
PATIENTS AND METHODSOf the 5206 patients recorded in the International Registry of Lung Metastases in the period 1945-1995, 328 (6.3%) had operations for pulmonary stage IV melanoma. The aims of the Registry, methodology of data collection and analysis have been published previously (Pastorino et al, 1997). In summary, all patients who had undergone resection of pulmonary metastases with curative intent were eligible for inclusion if their primary tumour, as well as metastases in other organs, had been effectively treated. Eighteen major centres from Europe, the USA and Canada took part in the project.
Data analysisSurvival time was calculated from first metastasectomy to the last date of follow-up, by means of the Kaplan-Meier estimate. Mean follow-up of patients alive was 42 months.The impact on survival of the following variables was tested: age, sex, radicality of metastasectomy, time to pulmonary metastases (time from surgery of primary melanoma to diagnosis of pulmonary metastases, TPM), number of pathologically confirmed metastases, resection volume, nodal involvement, delay of surgery from diagnosis of metastases to metastasectomy, chemotherapy, Lung metastases from melanoma: when is surgical treatment warranted? Summary Surgical treatment of lung metastases from melanoma is highly controversial as the expected outcome is much poorer than for other primary tumours and a reliable system for selecting patients is lacking. ...