Comparison of First-Line Chemotherapeutics and Validation of the EORTC Prognostic Index in Malignant Pleural Mesothelioma: Retrospective Single-Centre Experience.

To evaluate the efficiency of pemetrexed cisplatin in comparison with gemcitabine cisplatin and to validate the EORTC (European Organisation for Research and Treatment of Cancer) prognostic score in combination chemotherapy treatment for malignant pleural mesothelioma.  An observational study. Place and Duration of the Study: Department of Oncology, Dicle University Hospital, Diyarbakir, Turkiye, from October 2000 to November 2017. Malignant pleural mesothelioma (MPM) patients with EORTC score 0- were recruited. Factors affecting the prognosis of the disease and the effectiveness of first-line treatment were retrospectively analysed. EORTC prognostic score was calculated with a cut-off and survival analyses were used by the Kaplan-Meier method. Log-rank and univariable Cox regression tests were used to search for prognostic factors' impact on survival. Patients who received gemcitabine cisplatin treatment had a median progression-free survival (PFS) of 9 months, while those who received pemetrexed cisplatin therapy had a median PFS of 7 months. Median overall survival (OS) was 17 months in the gemcitabine cisplatin group and 18 months in the pemetrexed cisplatin group (p = 0.051). When the low-risk group was compared with the high-risk group, the median OS was found to be statistically significant (p = 0.009). The EORTC prognostic score, which is used for prognostic prediction in the period when pemetrexed is not utilised in the treatment of MPM, accurately predicts prognosis subsequent to the administration of pemetrexed in treatment. In the context of first-line treatment, cisplatin in combination with gemcitabine and cisplatin in combination with pemetrexed demonstrated comparable efficacy with respect to both overall survival and progression-free survival. Chemotherapy, Mesothelioma, Prognosis, Gemcitabine, Progression-free survival.