Pleurectomy-decortication in malignant pleural mesothelioma: are different surgical techniques associated with different outcomes? Results from a multicentre study

OBJECTIVES: The potential benefit of surgery for malignant pleural mesothelioma (MPM), especially concerning pleurectomy/decortication (P/D), is unclear from the literature. The aim of this study was to evaluate the outcome after multimodality treatment of MPM involving different types of P/D and to analyse the prognostic factors. METHODS: We reviewed 314 patients affected by MPM who were operated on in 11 Italian centres from 1 January 2007 to 11 October 2014. RESULTS: The characteristics of the population were male/female ratio: 3.7/1, and median age at operation was 67.8 years. The epithelioid histotype was observed in 79.9% of patients; neoadjuvant chemotherapy was given to 57% of patients and Stage III disease was found following a pathological analysis in 62.3% of cases. A total of 162 (51.6%) patients underwent extended P/D (EP/D); 115 (36.6%) patients had P/D and 37 (11.8%) received only a partial pleurectomy. Adjuvant radiotherapy was delivered in 39.2% of patients. Median overall survival time after surgery was 23.0 [95% confidence interval (CI): 19.6-29.1] months. On multivariable (Cox) analysis, pathological Stage III-IV [P = 0.004, hazard ratio (HR):1.34; 95% CI: 1.09-1.64], EP/D and P/D (P = 0.006, HR for EP/D: 0.46; 95% CI: 0.29-0.74; HR for P/D: 0.52; 95% CI: 0.31-0.87), left-sided disease (P = 0.01, HR: 1.52; 95% CI: 1.09-2.12) and pathological status T4 (P = 0.0003, HR: 1.38; 95% CI: 1.14-1.66) were found to be independent significant predictors of overall survival. CONCLUSIONS: Whether the P/D is extended or not, it shows similarly good outcomes in terms of early results and survival rate. In contrast, a partial pleurectomy, which leaves gross tumour behind, has no impact on survival.