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B.M. Ku
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P2.04 - Poster Session/ Biology, Pathology, and Molecular Testing (ID 234)
- Event: WCLC 2015
- Type: Poster
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:
- Coordinates: 9/08/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P2.04-004 - The BIM Deletion Polymorphism in Patients with EGFR-Mutant Non-Small Cell Lung Cancer Treated with EGFR Tyrosine Kinase Inhibitors (ID 1126)
09:30 - 09:30 | Author(s): B.M. Ku
- Abstract
Background:
A germline BIM deletion polymorphism has been proposed to predict poor treatment response to certain kinase inhibitors. The purpose of this study was to explore whether the BIM deletion polymorphism predicts treatment efficacy of epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) in Korean patients with EGFR-mutant NSCLC.
Methods:
Peripheral blood samples from a total of 205 patients with EGFR-mutant NSCLC who were treated with EGFR TKIs between July 2008 and April 2013 were included. The incidence of BIM deletions in these samples was detected by polymerase chain reaction. We compared the clinical outcomes in patients with and without the polymorphism after treatment with EGFR TKIs (gefitinib or erlotinib).
Results:
The BIM deletion polymorphism was present in 15.6% (32/205) of patients. One patient was homozygous for the deletion, and the remaining 31 had heterozygous deletions. The majority of patients were < 65 years old (74%), female (68%), never smokers (76%), and had stage IV NSCLC (67%). There were no associations between the BIM deletion polymorphism and clinicopathological features including gender, age, smoking status, histology, stage, and number of metastasis sites. Patients with and without the BIM deletion polymorphism had similar ORRs (91% vs. 84%, P = 0.585). Progression-free survival (PFS) and overall survival (OS) did not differ significantly between patients with and without the BIM deletion polymorphism (median PFS 12 vs. 11 months, P = 0.160; median OS 31 vs. 30 months, P = 0.452). Multivariate analysis identified significantly predictive markers for clinical outcomes of EGFR TKIs including ECOG PS 0-1, adenocarcinoma histology, recurrent disease, and EGFR mutation type. The results were validated in an independent cohort of 69 NSCLC patients.
Conclusion:
It remains to be determined whether the BIM deletion polymorphism provides intrinsic resistance or decreased sensitivity to EGFR TKIs in EGFR-mutant NSCLC patients.
