Plasma YKL-40 as a biomarker for bevacizumab efficacy in patients with newly diagnosed glioblastoma in the phase 3 randomized AVAglio trial

Oncotarget
Mogens K BoisenJulia S Johansen

Abstract

YKL-40 is a glycoprotein with pro-angiogenic functions. We hypothesized that patients with newly diagnosed glioblastoma and low baseline plasma YKL-40 levels derive greater benefit from first-line bevacizumab. Plasma samples were collected from 563 patients in the randomized, phase 3 AVAglio trial who received bevacizumab or placebo plus radiotherapy/temozolomide. Raw plasma YKL-40 concentrations were converted to age-corrected percentiles of normal healthy YKL-40 levels and divided into quartiles (Q). The impact of baseline plasma YKL-40 level on survival was investigated using Cox regression analyses. Patients with low baseline plasma YKL-40 (≤Q1) had an improved progression-free survival hazard ratio (HR) for bevacizumab versus placebo (0.37, 95% confidence interval [CI]: 0.25-0.55) compared with high plasma YKL-40 (> Q1) (0.71, 95% CI: 0.57-0.87). Overall survival HRs were comparable between the subgroups (≤ Q1: 0.69, 95% CI: 0.44-1.09; (> Q1: 0.88, 95% CI: 0.68-1.13). A trend for improved progression-free survival HR with low versus high YKL-40 was observed in proneural glioblastoma (0.41, 95% CI: 0.13-1.28 vs 0.80, 95% CI: 0.45-1.40, respectively), but not for proliferative/mesenchymal subtypes. Elevated plasma YKL-40 (> ...Continue Reading

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Methods Mentioned

BETA
biopsy
surgical resection
enzyme-linked immunosorbent assay

Clinical Trials Mentioned

NCT00943826

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