The Addition of Chloroquine to Chemoradiation for Glioblastoma

Three cohorts of 3 patients will receive chloroquine in escalating doses (3 dose levels: 200 mg up to 600 mg daily) during standard treatment (radiotherapy and temozolomide) for newly diagnosed GBM. Extra patients can be added to a cohort in case of dose limiting toxicity, resulting in a maximum of 6 patients per dose level. Based on the results of the DSMB an additional leven of 300mg was added.

Patients will receive megavoltage radiotherapy in a conventionally fractionated regimen of 59.4 Gy in 33 fractions in 6.5 weeks, using modern computer-based treatment planning and delivery techniques. Treatment should start within 6 weeks of surgery.

Patients will take TMZ 75 mg/m² po qd during the course of radiotherapy six adjuvant cycles of TMZ. After a 4 week break, patients will receive up to six cycles of adjuvant oral TMZ 150 - 200 mg/m² po qd for 5 days every 28 days. The starting dose is 150 mg/m² po qd. At the start of cycle 2 the dose will be escalated to 200mg/m2, if the CTC non-hematologic toxicity for cycle 1 is grade ≤2 (except for alopecia, nausea, and vomiting), absolute neutrophil count is ≥1.5 x 109/L and the platelet count ≥ 100 x 109/L.