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O22 - Mesothelioma III (ID 122)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Mesothelioma
- Presentations: 1
O22.07 - Does surgery improve survival of patients with malignant pleural mesothelioma? A multicenter retrospective analysis of 1365 consecutive patients. (ID 2962)
16:15 - 17:45 | Author(s): A. Bille
Medical management of malignant pleural mesothelioma (MPM) has obtained a moderate survival improvement over the years, while surgery with pleurectomy / decortication (P/D) or extrapleural pneumonectomy (EPP) can be an option for selected patients with resectable disease. The aim of this study was to investigate the impact of surgical treatment on the outcome of patients with MPM.
We retrospectively reviewed data from 1365 consecutive patients with histologically proven MPM, treated from 1982 to 2012 in six Institutions.Patients received either chemotherapy alone (n=172) or best supportive care (n=690) or surgical treatment (n=503), by either P/D (n=202) or EPP (n=301) with or without chemotherapy. All patients were followed up until death or for a minimum period of one year. The cox proportional hazards regression model was used to estimate relative improvements and to test the statistical hypothesis; a p-value less than 0.05 was considerd statistical significant.
Figure 1 Figure1. Kaplan-Meier survival curves according to the treatment (non surgical treatment vs EPP vs P/D) considering only patients with independent good prognostic factors After a median follow-up of 6.7 years (range 1.1-14.8), 230 (16.8%) patients were alive; median survival for patients who received palliative treatment or chemotherapy alone, P/D and EPP groups were 11.7 (95%CI: 10.5-12.5) months, 20.5 (95%CI: 18.2-23.1) months, and 18.8 (95%CI: 17.2-20.9) months, respectively. Testing the hypothesis of equal survival distributions the statistical significance was reached for the P/D and EPP groups versus non surgical treatment group (p <0.001) but not for the EPP versus P/D groups (p=0.885). The 30 day mortality was 2.6% after P/D and 4.1% after EPP (p=0.401). According to multivariate analysis (n=1227) age < 70, epithelial histology and chemotherapy were independent favourable prognostic factors. In the subset of 312 (25.4%) patients with all favourable prognostic factors median survival was 15.5 months after medical therapy alone, 19.4 months after P/D, and 18.7 months after EPP (Figure 1). A risk reduction of 31% (95%CI: 14-45%) for the P/D group and of 23% (95%CI: 7-36%) for the EPP group was observed compared to the medical treatment group.
Our data suggest that patients with good prognostic factors had a similar survival whether they received medical therapy only, P/D or EPP. The modest benefit observed after surgery over medical treatment requires further investigation, and a large multicenter randomized trial, testing P/D after induction chemotherapy versus chemotherapy alone in MPM patients with good prognostic factors, is needed.
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