Author of

• 17728

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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
  • Moderators:
  • Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)

  • 17749

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    P2.04-021 - Role of Adjuvant Radiotherapy and Prognostic Factor Analysis in Thymic Malignancies: A Retrospective Analysis of 129 Consecutive Patients (ID 5004)

    14:30 - 14:30  |  Author(s): P. Bastiani
    • Abstract

    Background:
    To evaluate the impact of histological subtypes, stage and therapeutic approaches on outcomes of a retrospective consecutive series of patients (pts) treated in 2 different Radiation Oncology Italian Centers
    
    Methods:
    One-hundred twenty nine pts were treated between 1982 and 2012.Sixty-six pts were male,63female;mean age was 58 years.The series was reclassified according to WHO 2004 staging:42 pts had epithelial/ mixed thymoma(type A/AB),72pts had cortical/medullary/atypical thymoma(B1/B2/B3) and 15 thymic carcinoma(type C).All pts were also staged using Masaoka classification(MKc) resulting in 43pts in stage I,30 stage IIA,13 stage IIB,24 stage III and 19 stage IVA.Radical surgery(thymectomy +/- mediastinal nodes sampling)was performed in all pts,30 of whom had positive margins,while 80 were also submitted to adjuvant thoracic RT(ART)due to their final pathological stage and/or surgical margins status. All pts were evaluated for clinical outcomes(overall survival-OS,progression free survival-PFS and local control-LC) and secondary malignancies incidence.
    
    Results:
    After a median follow up of 9.6 years,at time of analysis 103 pts were alive with a 5- and 10 year OS of 90.1%(SE±2,7)and 81.7(SE±3.7) respectively and a PFS of 84.8(SE±3.2) and 77.3(SE±4.0). Finally,5- and 10-year LC were respectively 94,1% (SE±2,2) and 89.2%(SE±3.2).In terms of OS, MKc advanced stage was found as a negative prognostic factors(p<0.0001) such as Performance Status (PS) with a p<0.0001, Tstage (p< 0,0001), aggressive histology (p=0.0001) and surgical positive margins (p< 0,0001) at univariate analysis. Regarding PFS,advanced MK stage,T stage, positive surgical margins and aggressive histology were confirmed as negative prognostic factor (p< 0,0001, p<0,0001, p<0,01, p<0,0001). Using Cox regression analysis ART seems to have a protective effect if stratified by MKc clinical stage (p< 0,03) just in terms of OS.Concerning local recurrence, a significant difference was found by T stage(p<0,001), surgical margins (p<0,03) and WHO classification(p=0.0001). At multivariate analysis PS, Surgical Margins and histology were statistically significant (p<0.0001, p<0.002 and p<0,001 respectively) with a negative impact on OS for PS>1, positive margins and thymic carcinoma differentiation. At the same analysis only thymic carcinoma differentiation influenced PFS when compared with PS, T and MKc stage, surgical margins and ART. During follow up secondary/methacronous neoplasms were diagnosed in 29 pts (22.5%)
    
    Conclusion:
    PS, surgical margins and WHO classification seems to be the most important indicators for long term survival. ART showed positive impact in terms of OS in advanced MKc clinical stage (Stage II-III) pts.