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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
- Moderators:N. Girard, S.B. Watzka
- Coordinates: 12/07/2016, 11:00 - 12:30, Schubert 2
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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): D. Ou
- Abstract
- Presentation
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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