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MA 19 - Mesothelioma: Bench to Bedside (ID 680)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Mesothelioma
- Presentations: 1
MA 19.03 - Nintedanib + Pemetrexed/Cisplatin in Malignant Pleural Mesothelioma (MPM): Phase II Biomarker Data from the LUME‑Meso Study (ID 8111)
11:00 - 12:30 | Author(s): A. Salnikov
Nintedanib is a triple angiokinase inhibitor. LUME-Meso (NCT01907100) is a randomised, Phase II/III study of ≤6 cycles of nintedanib+pemetrexed/cisplatin versus placebo+pemetrexed/cisplatin, followed by nintedanib or placebo maintenance, in chemo-naïve patients with MPM. In Phase II results, nintedanib+pemetrexed/cisplatin improved progression-free survival (PFS) versus control (hazard ratio [HR]=0.54; p=0.010), with a trend for prolonged overall survival (OS; HR=0.77; p=0.319). Benefit was most pronounced in patients with epithelioid tumours. Since no pharmacodynamic/predictive biomarkers are validated for anti-angiogenic therapies, exploratory analyses were conducted to investigate potential associations of plasma-derived angiogenic factors and genomic markers with treatment outcome in the LUME-Meso Phase II epithelioid population.
Blood samples were collected at baseline and, for patients receiving maintenance, at monotherapy Cycle 3 (C3mono) and end of monotherapy (EoTmono). Analyses focused on 58 angiogenic factors (Human AngiogenesisMAP[®] panel, Myriad RBM) and single-nucleotide polymorphisms (SNPs) in genes implicated in mesothelioma and/or associated with response to anti-angiogenic therapies in other tumour types (VEGFR1, VEGFR3 and mesothelin). Associations of biomarkers with treatment effect were evaluated by Cox regression and tested for interaction with false discovery rate (FDR) adjustment. Adjusted mean changes in angiogenic factor levels were compared between arms by ANCOVA. Analyses were exploratory, limited by small sample size, and considered hypothesis generating.
Of 77 patients with epithelioid tumours, angiogenic factor and genomic data were available for 71 and 67 patients, respectively. PFS/OS benefit of nintedanib appeared potentially more pronounced in patients with baseline plasma endoglin level below the median. There were possible weak associations between major homozygous genotypes for two VEGFR3 SNPs (rs307821 G/G and rs307826 A/A), and OS benefit and between VEGFR1 SNP rs9582036 A/A genotype and PFS benefit. Biomarker treatment associations were limited by small subgroup size, especially for low-frequency SNPs, and interaction tests were not significant after FDR adjustment. Regarding pharmacodynamic effects, adjusted mean change in interleukin-8 levels with nintedanib was greater from baseline to C3mono and lower from C3mono until EoTmono, compared with placebo. Nintedanib showed lower adjusted mean changes versus placebo for VEGFR2 from baseline to C3mono, and for VEGFR2 and VEGFR3 from baseline to EoTmono.
These analyses represent the first biomarker results for nintedanib-treated MPM. While there seemed to be signals for greater PFS and OS improvement in patients with low plasma endoglin and major homozygous VEGFR1/3 genotypes, no biomarkers showed clear significant association with treatment benefit. These findings warrant further evaluation in the Phase III study.
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