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T. Molina



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    OA18 - New Insights in the Treatment of Thymic Malignancies (ID 408)

    • Event: WCLC 2016
    • Type: Oral Session
    • Track: Mesothelioma/Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies
    • Presentations: 1
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      OA18.07 - Quality of Resection and Outcome in Stage III TETs: The French RYTHMIC Network Experience (ID 6173)

      12:05 - 12:15  |  Author(s): T. Molina

      • Abstract
      • Presentation
      • Slides

      Background:
      Stage III TET represents a heterogeneous population and their optimal approach remains unclear; most of the available literature is composed of small series spanned over extended periods of time. RYTHMIC (Réseau tumeurs THYMiques et Cancer) is a French nationwide network for TET with the objective of territorial coverage by regional expert centers and systematic discussion of patients management at national tumor board. We reviewed our experience in stage III thymic tumors in order to evaluate the value of tumor board recommendations and multidisciplinary approach.

      Methods:
      We conducted a retrospective analysis of patients (pts) with stage III TET discussed at the RYTHMIC tumor board from January 2012 to December 2015. Clinical, pathologic and surgical data were prospectively collected in a central database. Survival rates were based on Kaplan-Meier estimation. Cox proportional hazard models were used to evaluate prognostic factors for disease free survival (DFS) and overall survival (OS).

      Results:
      150 pts were included in the analysis. Median age was 64 years [18 – 91], 56% males, thymoma A-B2/ B3-thymic carcinoma in 52% and 47% respectively; 12% presented with autoimmune disorder (76% myasthenia). Local treatment was surgery in 134 pts (90%) followed by radiotherapy (RT) in 90 pts; 26 pts received preoperative chemotherapy (CT). Complete resection rate (R0) was 53%. Among 38 pts considered non-surgical candidates at diagnosis, 26 pts became resectable after induction CT with a R0 rate of 58%; 12 pts received CT-RT and/or CT as primary treatment. Recurrence rate was 38% (n=57), first sites were pleural (n=32) and lung (n=12). The 5-year OS and DFS were 88% and 32% respectively. Gender (HR: 0.2 [95%CI 0.04 - 0.97] p=0.04), histology (HR: 0.19 [95%CI 0.05 - 0.70] p=0.02) and surgery (HR: 0.4 [95%CI 0.01 - 0.20] p<0.001) as primary treatment modality were significant prognostic factors for OS in multivariate analysis. Histology (HR: 0.5 [95%CI 0.30 - 0.90] p=0.02) and adjuvant RT (HR: 0.4 [95%CI 0.20 – 1.00] p=0.05) were significantly associated with DFS. Completeness of resection was not associated with survival in our cohort.

      Conclusion:
      Surgery followed by radiotherapy improves outcome irrespectively of R0. Stage III TET not candidate to surgery should be reassessed for resection after induction chemotherapy.

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    P2.04 - Poster Session with Presenters Present (ID 466)

    • Event: WCLC 2016
    • Type: Poster Presenters Present
    • Track: Mesothelioma/Thymic Malignancies/Esophageal Cancer/Other Thoracic Malignancies
    • Presentations: 1
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      P2.04-003 - Chemotherapy in Advanced Thymic Epithelial Tumors: Insights from the RYTHMIC Prospective Cohort (ID 4275)

      14:30 - 14:30  |  Author(s): T. Molina

      • Abstract
      • Slides

      Background:
      Thymic Epithelial Tumors (TET) are rare intrathoracic malignancies, which may be aggressive and difficult to treat. In the advanced setting, chemotherapy may be delivered as a primary/induction therapy before subsequent surgery or definitive radiotherapy, and/or as exclusive treatment in patients for whom no focal treatment is feasible, and/or in the setting of recurrences. As no randomized trial and a limited number of prospective studies are available, there is paucity of prospective, multicentre evidence regarding response rates and survival of patients. RYTHMIC is the nationwide network for TET in France. The RYTHMIC prospective database is hosted by the French Intergroup (IFCT), and collects data for all patients diagnosed with TET, for whom management is discussed at a national multidisciplinary tumor board (MTB) based on consensual recommendations. Primary, exclusive chemotherapy, and chemotherapy for recurrence accounted for 149 (11%), 37 (3%), and 67 (5%) questions of a total of 1401 questions raised at the MTB between 2012 and 2015.

      Methods:
      All consecutive patients for whom chemotherapy and/or systemic treatment was discussed at the RYTHMIC MTB from 2012 to 2015 were identified from the RYTHMIC prospective database. Main endpoints were response rates and progression-free and overall survival.

      Results:
      At the time of analysis, data were available for 156 patients (80 thymic carcinomas, and 76 thymomas), for whom the management led to raise 283 questions at the MTB: 67 (24%) for primary chemotherapy, 35 (11%) for exclusive chemotherapy, and 181 (64%) for recurrences. For primary and exclusive chemotherapy, the most frequently administered regimen was CAP, producing response rates of 70% and 60%, respectively. A total of 104 patients received at least one line of chemotherapy for recurrence; 53 patients received second-line treatment, and 13 and 7 patients received third- and fourth line treatment. In the setting of first recurrence, carboplatine-paclitaxel combination was the most preferred regimen, administered to 54% of patients; overall response and disease control rates to systemic treatments for recurrences were 13% and 42% in thymic carcinomas, and 19% and 43% in thymomas (p=0.38 and p=0.92, respectively). Median recurrence-free survival after primary chemotherapy was 16.6 months; median progression-free survival after exclusive chemotherapy, and first-, second-, and third-line chemotherapy for recurrence were 6.0 months, and 7.6 months, 6.2 months, and 6.0 months.

      Conclusion:
      Our data provide with a unique insight in the efficacy of chemotherapy for advanced thymic epithelial tumors in a real-life setting; our results help the decision-making to better define the optimal therapeutic strategies.

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