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W. Weder



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    MO14 - Mesothelioma II - Surgery and Multimodality (ID 121)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Mesothelioma
    • Presentations: 1
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      MO14.05 - Intracavitary Cisplatin-Fibrin Chemotherapy after Resection for Malignant Pleural Mesothelioma Patients (INFLuenCe-Meso) - preliminary results (ID 2683)

      10:50 - 10:55  |  Author(s): W. Weder

      • Abstract
      • Presentation
      • Slides

      Background
      Local mesothelioma recurrence remains a challenge even after multimodal therapy. Intracavitary chemotherapy is a promising approach to improve local tumor control. In preclinical studies we observed improved pharmacokinetic characteristics when cisplatin was loaded to a fibrin carrier and applied to the chest wall after surgery while effectiveness remained the same compared to cisplatin applied as a solution. We will present the first results of a phase I –dose-escalation-clinical study.

      Methods
      Since 11/2012 3 patients were included in the study. Cisplatin-fibrin was applied after pleurectomy/decortication (P/D) to the chest wall in a concentration of 11 mg/m[2] BSA. Blood samples were taken at several time points after the application (2, 6, 10, 24, 48 and 120 hours) to assess serum cisplatin levels and to test toxicity in the early phase until 14 days postoperatively. The concentration of total platinum was quantified by means of inductively coupled plasma sector field mass spectrometric detection. Adverse events were graded according to the CTCAE.

      Results
      Between November 2012 and March 2013 three patients (2x epithelioid, 1x biphasic) in stage II, III and stage IV were included and received P/D plus Cisplatin-Fibrin in a concentration of 11 mg/m[2]. The maximum concentration of cisplatin in the serum was below 0.3 µg/g at 2 h after application and continued to decrease over a period of 5 days (see image 1). No severe adverse events were observed. The adverse events documented were not related to cisplatin (table 1):

      Diagnosis / symptoms CTC AE grading Number of patients Related to Cisplatin
      Fatigue Grade II 2 possible
      Anemia Grade III 2 unlikely
      Nausea / vomiting Grade I 1 possible
      Increased kreatinin & urea levels Grade II 1 possible
      Increased CK levels Grade IV 1 unlikely
      Increased level of transaminases Grade III 1 unlikely
      Urinary retention Grade II 1 unlikely
      Hypotension Grade II 1 unlikely
      Pneumothorax Grade II 1 unlikely
      Figure 1

      Conclusion
      Our preliminary results show, that cisplatin-fibrin application to the chest wall and the lung surface after P/D is safe on a dose level of 11mg/m2 BSA. As no treatment related mortality and no drug related toxicity was observed we escalate the dosage to 22 mg/m2 BSA, further results including chest wall concentrations of cisplatin will be available in October.

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    P3.06 - Poster Session 3 - Prognostic and Predictive Biomarkers (ID 178)

    • Event: WCLC 2013
    • Type: Poster Session
    • Track: Biology
    • Presentations: 1
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      P3.06-020 - Prognostic Markers for Mesothelioma Patients Treated with Induction Chemotherapy Followed by Extrapleural pneumonectomy (ID 1879)

      09:30 - 09:30  |  Author(s): W. Weder

      • Abstract

      Background
      Multimodal treatment provides the best outcome for some but not all malignant pleural mesothelioma (MPM) patients. Therefore the identification of prognostic markers helping to select patients remains a subject of key importance. Frequent loss of NF2 tumor suppressor gene, a regulator of Hippo pathway and mammalian target of rapamycin (mTOR) has been well documented in MPM. We recently observed loss of expression of phosphatase and tensin homologue (PTEN), a tumor suppressor gene of the phosphatidylinositol 3-kinase (PI3K)/mTOR pathway, in 62% of MPM patients. In this regard, increased activity of these pathways stemming from loss of abovementioned tumor suppressor genes may serve as potential prognosticator as well as therapeutic target. Here we aim to assess prognostic significance of PI3K/mTOR and Hippo pathways for MPM patients treated with a multimodal approach.

      Methods
      Large cohort of MPM patients uniformly treated with induction chemotherapy followed by extrapleural pneumonectomy was employed in this study. Tissue micro arrays were constructed composing of paired samples from patients (n = 153) collected pre- and post-induction chemotherapy. All tissues were evaluated for apoptotic index (cleaved caspase-3) and proliferation index (Ki-67). Expression levels of biomarkers of PI3K/mTOR (PTEN, p(phosphorylated)-mTOR and p-S6) and Hippo signaling pathway (nuclear-YAP and nuclear-Survivin) were evaluated by immunohistochemistry and correlated with overall survival (OAS) and progression free survival (PFS).

      Results
      Survival analysis showed that high p-S6 expression and high Ki-67 index in samples of treatment naïve patients was associated with shorter PFS (p = 0.02 and p = 0.04, respectively). High Ki-67 index after chemotherapy remained associated with shorter PFS (p = 0.03) and OAS (p = 0.02). Paired comparison of marker expression in samples prior and post induction chemotherapy revealed that decreased cytoplasmic PTEN as well as increased p-mTOR expression was associated with a worse OAS (p = 0.04 and 0.03, respectively). No correlation was observed between expression level of nuclear-YAP with PFS or OAS.

      Conclusion
      Ki-67 proliferation index has prognostic value for MPM patients treated with multimodality approach in when analyzed both pre- and post- induction chemotherapy specimens. Our results further reveal the prognostic significance of expression changes of PI3K/mTOR pathway components during induction chemotherapy. If confirmed, these data suggest PI3K/mTOR pathway to be a target for selected MPM patients.