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U. Keilholz
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MINI 30 - New Kinase Targets (ID 157)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:K. Park, M. Villalona
- Coordinates: 9/09/2015, 18:30 - 20:00, Four Seasons Ballroom F3+F4
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MINI30.03 - Smoking Predicts Sensitivity to PARP Inhibitor, Veliparib, in Advanced NSCLC Patients (ID 1279)
18:30 - 20:00 | Author(s): U. Keilholz
- Abstract
- Presentation
Background:
Tobacco-related non-small cell lung cancer (NSCLC) is associated with reduced survival and greater genomic instability. Veliparib (V) is a PARP inhibitor that augments platinum-induced DNA damage in preclinical studies, and a recent Phase 2 trial of advanced NSCLC trended to improved survival (HR 0.80; CI 0.54–1.18) when V was added to carboplatin (C) and paclitaxel (P). Here we report outcomes based on smoking status from this randomized Phase 2 study of CP with either V or placebo in advanced NSCLC.
Methods:
Patients with previously untreated advanced/metastatic NSCLC were randomized 2:1 to CP with either V at 120mg BID or placebo (randomization stratified by histology and smoking history). Cotinine was measured in patients’ plasma samples as an index of recent tobacco use.
Results:
Of 158 patients, 68% were male, and 49% had squamous NSCLC. At study entry, 60% pts were self-reported current smokers, 27% former smokers, and 13% never smoked. There were no significant differences in veliparib pharmacokinetic parameters between cotinine-high and low. Grade 3/4 AEs were elevated in current-smokers treated with VCP vs CP (66% vs. 40%, p=0.026); all-grade AEs and SAEs were similar between the two groups. The most common AEs in current-smokers were neutropenia (41% VCP; 27% CP), alopecia (36%; 33%), and anemia (31%; 40%). Figure 1 A sensitivity analysis of heavy vs light-smokers (≥ vs <39 pack-years, current or former smokers) showed advantage of veliparib in heavy-smokers: median PFS [HR(95% CI)] for VCP/CP was 7.0 vs 3.5 [0.43(0.20–0.94)] for heavy-smokers and 4.4 vs 4.2 [0.97(0.49–1.92)] for light-smokers; median OS was 12.6 vs 8.8 [0.52 (0.27–1.02)] for heavy-smokers and 9.9 vs 8.8 [0.92(0.53–1.61)] for light-smokers. A cotinine sensitivity analysis found that outcomes in cotinine-high were similar to current-smokers: PFS, cotinine-high HR was 0.38 (0.19–0.73) and cotinine-low was 0.97 (0.51–1.87); OS, cotinine-high HR was 0.52 (0.29–0.92) and cotinine-low was 1.07 (0.63–1.81). In univariate analyses assessing the influence of baseline characteristics and treatment on outcomes, smoking status and treatment had a significant interaction (p=0.0301 PFS, p=0.0118 OS). Additionally, multivariate analysis including all factors also identified current smoking as predictive of improved outcomes with VCP.
Conclusion:
Smoking status was a strong predictor of efficacy for veliparib-chemotherapy combination in advanced NSCLC. No differences in pharmacokinetics of V were seen based on plasma cotinine; toxicity of VCP was acceptable regardless of smoking history. A Phase 3 study has been initiated in patients with smoking history (M14-359).
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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
- Moderators:
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P1.01-075 - Phase III, Randomized, Double-Blind Trial of Bavituximab Plus Docetaxel in Previously Treated Stage IIIb/IV Non-Squamous NSCLC (SUNRISE) (ID 1581)
09:30 - 17:00 | Author(s): U. Keilholz
- Abstract
Background:
Exposed phosphatidylserine (PS) in the tumor microenvironment is highly immunosuppressive. PS binding to PS receptors on myeloid derived suppressor cells (MDSC) and M2 macrophages leads to production of anti-inflammatory cytokines such as TGF-β and IL-10. Bavituximab, a first-in-class PS-targeting monoclonal antibody, counters these effects, resulting in production of pro-inflammatory cytokines such as TNF-α and IL-12, maturation of dendritic cells and induction of tumor specific cytotoxic T lymphocyte (CTL) immunity. Docetaxel has also been shown to suppress MDSCs while increasing tumor antigens and T-cell mediated cytotoxicity, thereby enhancing bavituximab’s immunomodulatory effects. In a prior double-blind Phase II trial in 2nd line non-squamous non-small cell lung cancer, bavituximab 3 mg/kg plus docetaxel was well-tolerated and demonstrated 60% improvement (11.7 vs 7.3 month) in median overall survival (OS) compared to control.
Methods:
SUNRISE is a Phase III, double-blind trial where patients with previously treated Stage IIIb/IV non-squamous, non-small cell lung cancer are randomized in a 1:1 ratio to receive up to six 21-day cycles of docetaxel in combination with either weekly 3 mg/kg bavituximab or placebo, followed by maintenance with weekly bavituximab or placebo until progression or toxicity. Patients will be stratified by region (North America, Europe, or Rest of World), disease stage (IIIb or IV), and previous maintenance/targeted therapy (yes or no). This trial was initiated in December 2013 and accrual of 582 patients across 160+ sites in 14 countries is planned over 24 months. The primary endpoint is OS and two interim analyses are planned. Secondary endpoints include progression-free survival (PFS), overall response rate (ORR) and safety. Radiographic tumor response is centrally assessed every two cycles during combination therapy and every nine weeks during maintenance. Exploratory analysis will include the assessment of changes in circulating immune cells and cytokines to better understand the immunotherapeutic mechanism.
Results:
Trial in progress
Conclusion:
Trial in progress
