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S. Byeon
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P3.01 - Poster Session/ Treatment of Advanced Diseases – NSCLC (ID 208)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 9/09/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P3.01-016 - Does Sequence of Cranial Radiotherapy Matter in EGFR Mutant Non-Small Cell Lung Cancer Patients with Brain Metastasis? (ID 2260)
09:30 - 09:30 | Author(s): S. Byeon
- Abstract
Background:
The incidence of brain metastasis in EGFR mutant advanced non-small cell lung cancer (NSCLC) is higher than EGFR wild type at the time of diagnosis. Although cranial radiotherapy is considered standard treatment for brain metastasis, EGFR tyrosine kinase inhibitors (TKIs) alone have shown promising activity with up to 80% of response in EGFR mutant NSCLC patients with brain metastasis. However, the role of sequential cranial radiotherapy in EGFR mutant NSCLC treated with EGFR TKIs remains to be determined.
Methods:
Advanced NSCLC patients harboring EGFR mutation (exon 19 deletion or L858R) with brain metastasis who were treated with EGFR TKIs were retrospectively reviewed. To investigate the role of cranial radiotherapy, we analyzed the clinical outcomes between patients treated with EGFR TKIs alone and those treated with cranial radiotherapy (WBRT or SRS) followed by EGFR TKIs (combination therapy). The primary end point was overall survival (OS) and secondary end points included intracranial and extracranial progression free survival (PFS).
Results:
A total of 573 patients who identified EGFR mutation and received EGFR TKIs treatment for NSCLC with brain metastasis from Jan 2007 to Dec 2013 at Samsung Medical Center were enrolled for analysis. Of all 573 patients, 121 patients had brain metastasis in initial work up. There were 38 males and 83 female, a median age was 59.5 years (range 30 – 80). All 121 patients were received gefitinib (n=103) or erlotinib (n=18) as EGFR TKI treatment for 1[st] line chemotherapy. 74 patients were treated with combination therapy (34 patients were taken SRS, 28 patients WBRT, 12 patients both), and 47 patients were treated with EGFR TKI alone. In combination therapy group, 32 patients had brain metastasis related symptoms.The median OS was 38.7 months [95% Confidence Interval 35.0 to 42.5] in combination therapy group and 28.6 months [95% CI 24.3 to 32.8] in EGFR TKI alone group (p=0.295). There were no significant differences in intracrainal PFS (18.6 vs 19.7 months, p=0.343) and extracranial PFS (15.7 vs 15.3 months, p=0.574) between two groups.
Conclusion:
In this retrospective analysis, the combination therapy with cranial radiotherapy followed EGFR TKI did not improve OS and intracranial PFS compared with EGFR TKI alone therapy in EGFR mutant NSCLC patients with brain metastases. Further prospective studies are needed to refine the role of sequential cranial radiotherapy in EGFR mutant NSCLC treated with EGFR TKIs.
