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P1.01 - Poster Session/ Treatment of Advanced Diseases – NSCLC (ID 206)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
P1.01-014 - Long Term Clinical Benefit of EGFR wt in Advanced NSCLC Patients Treated for Long Time with Salvage Erlotinib. A Retrospective Analysis (ID 687)
09:30 - 17:00 | Author(s): A. Kalikaki
Erlotinib (E) has been approved for the management of NSCLC patients (pts) after failure of the first or subsequent line of chemotherapy. Although the efficacy of E is clearly associated with the presence of drivers EGFR mutations, there is a subset of pts with EGFR wild type (EGFR wt) tumors who impressively respond. We retrospectively analyzed the clinical and pathological characteristics of a group of pts with unresectable EGFR wt NSCLC treated for a prolonged period with salvage (≥ 2[nd] line setting) E.
Patients with unresectable EGFRwt NSCLC who received ≥ 2[nd] line treatment with E without disease progression for at least 6 months, were sought from the database of HORG. Pts with available tumor material were molecularly (KRAS, BRAF, PI3K, HER2 mutations and ALK-EML4 translocation) characterized.
Among 1450 pts treated in different HORG’s collaborating centers (from 2004-2013), 44 (3.03%) received E for >6months (median: 10.1 mo; range, 6.0-36.5). 17 were women, 57% had no history of smoking, 42 had a PS (ECOG) of 0-1; 16% had squamous cell histology and 73% adenocarcinoma. KRAS mutations were detected in 20.5% (9/42 tested) of the pts, PI3K mutations in 9% (3/30 tested) and ALK-EML4 translocation in 9.5% (2/21 tested); there was no patient with HER2 or BRAF mutated tumor. 11(25%) pts experienced a partial response and 26 (59%) stable disease (Tumor growth control rate 84%). The median PFS and OS was 10.1 (6.0-40.6) and 24.1 (6.0- 89.1) months, respectively. Pts with KRAS wt tumors had a significantly (p=0.018) better OS compared to pts with KRAS mutant tumors. There was a trend of improved PFS (p=0.083) and OS (p=0.053) in favor of pts with adenocarcinoma compared to pts with squamous cell carcinoma.
Treatment with E significantly improves the clinical outcome in a subset of NSCLC pts with EGFR wt tumors. Pts with non-squamous pathology and no smoking history seem to benefit most from such therapy. KRAS mutation was the only molecular alteration correlated with the clinical outcome. Further molecular analysis of these pts could help to more appropriately define this particular group of patients.
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