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MINI 17 - WT EGFR, Angiogenesis and OMD (ID 131)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
MINI17.01 - Maintenance with Gefitinib/Pemetrexed (G/P) or P After Induction P/Platinum for Stage IV Lung Adenocarcinoma with No Sensitizing EGFR Mutation (ID 608)
16:45 - 18:15 | Author(s): T. Hsia
We have proposed that synergistic epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI)-chemotherapeutic interaction in lung cancer cells has 3 essentials: no platinum, cells not or no more sensitive to EGFR-TKI, and using a synergistic chemo partner, e.g., pemetrexed (P) (Tsai, et al. Lung Cancer 82:305, 2013).
GENIUS study (NCT01579630) was a phase II, multicenter, randomized, open-label prospective trial comparing maintenance G/P versus P in patients with metastatic lung adenocarcinoma (mLADC) harboring no sensitizing EGFR mutations (sEGFRm) detected by high sensitivity methods following a 4-cycle P/Platinum induction therapy in frontline setting. Patients with no disease progression (PD) were 1:1 randomized to receive P (500 mg/m, 3-week cycle) ± G (250 mg, daily) until PD or treatment failure, and stratified by study site and response. The primary endpoint was progression free survival (PFS) by both independent radiologist review (IRR) and investigator assessment (IA), secondary endpoints included time to treatment failure (TTF), overall survival (OS), safety and toxicity profile.
Between 03/2011 and 11/2013, 55 patients were randomized, G/P 26, P 29. Baseline characteristics were balanced between arms (age 57; female 42%; never smoker 55%; ECOG1 91%; ≥2 metastatic sites 38.2%; ALK+ 16%). Median follow-up was 20.4 mo. Median cycle of treatment was G/P 9.5 (range 1-32) and P 4 (2-21). Median PFS was substantially longer for G/P than P, both by IRR (3 deemed as PD at randomization were excluded; n = 25 v 27): 8.4 v 3.8 mo; HR [95% CI] 0.42 [0.23-0.79]; p = 0.0057, and by IA: 8.7 v 2.9 mo; HR 0.38 [0.21-0.70], p = 0.0013. Response with induction therapy, age, and smoker had interactions with treatment for PFS. Median TTF: 7.0 v 2.9 mo; HR 0.46 [0.25-0.83], p = 0.0085. OS was also better for G/P than P by IRR (undefined v 29.3 mo; HR 0.44 [0.20-0.97]; p = 0.037) and IA (undefined v 21.7 mo; HR 0.46 [0.22-0.97]; p = 0.038). There were more treatment-related diarrhea, liver and skin toxicities on G/P v P, but generally mild. Two G/P patients were off-study due to liver toxicity.
This proof of concept ph 2 study first demonstrated survival benefit of EGFR-TKI plus chemo in the maintenance phase of frontline treatment for patients with mLADC harboring no sEGFRm. This strategy deserves phase III study to confirm.
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