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MO06 - NSCLC - Chemotherapy I (ID 108)
- Event: WCLC 2013
- Type: Mini Oral Abstract Session
- Track: Medical Oncology
- Presentations: 1
- Moderators:R. Perez-Soler, P.M. Ellis
- Coordinates: 10/28/2013, 16:15 - 17:45, Parkside Ballroom A, Level 1
MO06.03 - Bevacizumab and erlotinib or bevacizumab, cisplatin and pemetrexed in patients with metastatic non-small cell lung cancer: EGFR mutation based treatment allocation and repeat biopsy at progression in the SAKK19/09 (BIOPRO) trial (ID 1862)
16:15 - 17:45 | Author(s): A. Ochsenbein
Treatment allocation by EGFR mutation and maintenance therapy are two new standards for patients (pts) with metastatic non-small cell lung cancer (NSCLC). This multicenter phase II trial (NCT01116219) for the first time prospectively tested pemetrexed and bevacizumab maintenance therapy in pts with EGFR wild type NSCLC, and included repeat biopsy at progression to study molecular mechanisms of drug resistance. Pts with EGFR mutation were treated with erlotinib and bevacizumab, based on the results of the previous SAKK19/05 trial.
100 pts were enrolled with metastatic nonsquamous NSCLC, sufficient material for mutation analysis and translational research, and consent to repeat biopsy at progression. Pts with EGFR wild type received 4 cycles of bevacizumab 7.5mg/kg, cisplatin 75mg/m2 (or carboplatin AUC5) and pemetrexed 500mg/m2 every 3 weeks, followed by maintenance therapy with bevacizumab and pemetrexed until progression. Pts with EGFR mutation received bevacizumab 7.5 mg/kg every 3 weeks and erlotinib 150 mg daily until progression. Pts were followed by CT-scan every 6 weeks and repeat biopsy was performed at progression. The primary endpoint was progression free survival (PFS) at 6 months. For an unpromising PFS at 6 months rate of ≤20% and a promising rate of ≥35%, 77 patients with EGFR wild type were needed to reach a power of 90% and an alpha level of 5%. Secondary endpoints were median PFS, overall survival (OS), best response rate of CR+PR (RECIST), and further biomarkers including KRAS, thymidylate synthase (TS), and multigene expression.
Seventy-seven pts with EGFR wild type and 20 pts with EGFR mutation were evaluable, 3 pts were not evaluable. Pts on bevacizumab and chemotherapy received on average 9 cycles (range 1-25). No unexpected toxicities were observed. PFS at 6 months was 45.5% (CI: 34.1%, 57.2%), median PFS was 6.9 (CI: 4.6, 8.3) months, OS was 12.1 (CI: 8.7, 14.7) months, and best response rate of CR+PR was 62%. Sixteen pts remain on treatment. Repeat biopsy at progression was successful in 31 of 39 (79%) of patients on trial treatment, and except for one transient pneumothorax, no relevant complications occurred. KRAS mutation was associated with poor overall survival (HR 2.0, CI: 1.05, 3.88; P=0.03), but not with PFS or best response. Pts on bevacizumab and erlotinib received on average 16 cycles (range 6-37). PFS at 6 months was 70.0% (CI: 45.7%, 88.1%), median PFS was 14.0 (CI: 8.8, NA) months, median OS is not yet reached, best response rate of CR+PR was 70%, 11 pts remain on treatment. Further analysis of serial serum and tumor samples is ongoing.
Compared with the previous POINTBREAK trial of pemetrexed and bevacizumab maintenance in genetically unselected pts, this trial demonstrates almost identical survival rates in pts with EGFR wild type. KRAS mutation was prognostic, repeat biopsy at progression was feasible, and laboratory analysis is ongoing to validate TS and to develop a predictive gene signature. Firstline therapy with erlotinib and bevacizumab is promising in pts with EGFR mutation, and this combination is further tested in the ongoing ETOP 2-11 BELIEF trial.
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