Glioblastoma Clinical Trial
Official title:
A Phase II Randomized Controlled Trial for the Addition of Chloroquine, an Autophagy Inhibitor, to Concurrent Chemoradiation for Newly Diagnosed Glioblastoma
Glioblastomas (GBM) are the most common type of primary brain tumors with an annual incidence of approximately 500 patients in the Netherlands. Despite extensive treatment including a resection, radiation therapy and chemotherapy, the median overall survival is only 14.6 months. Epidermal growth factor receptor (EGFR) amplification or mutation is regularly observed in GBM and is thought to be a major contributor to resistance to radiotherapy and chemotherapy. The most common EGFR mutation in GBM (EGFRvIII) is present in 30-50% of GBM. Previously MAASTRO lab has shown that expression of EGFRvIII provides GBM cells with a survival advantage when exposed to stress factors such as hypoxia and nutrient deprivation. These metabolic stress factors activate a lysosomal degradation pathway, known as autophagy. Inhibition of autophagy sensitizes cells to hypoxia, reduces the viable hypoxic fraction in tumors with > 40% and subsequently sensitizes these tumors to irradiation. Chloroquine (CQ) is a potent autophagy blocker and is the most widely investigated substance in this context. Previously, the effect of CQ has been demonstrated in a small randomized controlled trial in GBM treated with radiotherapy and carmustine. Although not statistically significantly different, the rate of death over time was approximately half as large in patients receiving CQ as in patients receiving placebo. The intracellular effects of CQ are dose-dependent. Therefore, the authors suggest an increase in daily dose of CQ may be necessary. Furthermore, the combination of CQ with TMZ may induce more damage to the neoplastic cells. In the phase I part of this trial the recommended dose of CQ in combination with radiotherapy and temozolomide will be tested. In the phase II part of the trial patients with a histologically confirmed GBM will be randomized between standard treatment consisting of concurrent radiotherapy with temozolomide and adjuvant temozolomide (arm A) and standard treatment plus CQ (arm B).
This study is a multi-centre randomized controlled, open label, phase II trial for patients with de-novo GBM. Eligible patients will be randomized between arm A and arm B: Arm A (standard): Radiotherapy and chemotherapy according to standard protocol for newly diagnosed GBM. This consists of 30 daily fractions of 2 Gy or 33 fractions in 1.8 Gy to the tumor and surrounding margin in combination with temozolomide 75 mg/m² per os daily (po qd) and six adjuvant cycles of temozolomide 150 - 200 mg/m² po qd. Arm B (experimental): Standard treatment as described under arm A combined with daily intake of 400mg CQ. CQ will start with one week before the start of radiotherapy and end on the last day of radiotherapy. In a single centre exploratory substudy, thirty subjects sequentially recruited within MAASTRO clinic randomized to arm B will be invited to receive two 3-[18F]fluoro- 2-(4-((2-nitro-1H-imidazol-1-yl)methyl)-1H-1,2,3-triazol-1- yl)propan-1-ol PET-scans ([18F]HX4 ). The first on day -6 (start CQ), the second on day 0 (before the start radiotherapy and TMZ). ;
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