This phase III trial compares the effect of adding lomustine to standard chemotherapy with temozolomide and radiation therapy versus temozolomide and radiation therapy alone in shrinking or stabilizing newly diagnosed MGMT methylated glioblastoma. MGMT methylated tumors are more likely to respond to temozolomide chemotherapy. Temozolomide is in a class of medications called alkylating agents. It works by damaging the cell's DNA and may kill tumor cells and slow down or stop tumor growth. Lomustine is a chemotherapy drug and in a class of medications called alkylating agents. It damages the cell's DNA and may kill tumor cells. Radiation therapy uses high energy x-ray photons to kill tumor cells and shrink tumors. Adding lomustine to standard chemotherapy with temozolomide and radiation therapy may shrink or stabilize glioblastoma.
PRIMARY OBJECTIVE: I. To determine if the regimen with the two alkylating agents temozolomide and lomustine with radiotherapy (RT) significantly prolongs overall survival (OS) versus (vs.) standard chemoradiotherapy with temozolomide in patients with newly diagnosed glioblastoma (GBM) with MGMT promoter methylation. SECONDARY OBJECTIVES: I. To determine if the regimen with the two alkylating agents temozolomide and lomustine with radiotherapy (RT) significantly prolongs progression-free survival (PFS) vs. standard chemoradiotherapy with temozolomide in patients with newly diagnosed GBM with MGMT promoter methylation. II. To compare the two different chemotherapy regimens on patient-reported outcomes (PROs), as measured by the MD Anderson Symptom Inventory - Brain Tumor (MDASI-BT) in patients with newly diagnosed GBM with MGMT promoter methylation. III. To determine if the regimen with the two alkylating agents temozolomide and lomustine with radiotherapy (RT) is associated with inferior short-term change in PROs as measured by MDASI-BT vs. standard chemoradiotherapy with temozolomide in patients with newly diagnosed GBM with MGMT promoter methylation. IV. To assess toxicity in the two different chemotherapy regimens. EXPLORATORY OBJECTIVES: I. To assess the association between absolute lymphocyte counts and outcomes. II. To assess the association between CD4+ lymphocyte counts and outcomes. III. To compare the two different chemotherapy regimens in terms of long-term PROs as measured by MDASI-BT at years 1 and 2. OUTLINE: Patients are randomized to 1 of 2 arms. ARM I: Patients undergo radiation therapy 5 days per week and receive temozolomide orally (PO) once daily (QD) for 6 weeks in the absence of disease progression or unacceptable toxicity. Patients then receive temozolomide PO QD on days 1-5 of each cycle. Treatment repeats every 28 days for 6 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo magnetic resonance imaging (MRI) throughout the trial. ARM II: Patients undergo radiation therapy 5 days per week for 6 weeks in the absence of disease progression or unacceptable toxicity. Patients also receive lomustine PO on day 1 of each cycle and temozolomide PO QD on days 2-6 of each cycle. Treatment repeats every 42 days for 6 cycles in the absence of disease progression or unacceptable toxicity. Patients also undergo MRI throughout the trial. After completion of study treatment, patients are followed up every 3 months for year 1, every 4 months for year 2, and then every 6 months thereafter.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
265
Given PO
Undergo MRI
Undergo radiation therapy
Ancillary studies
Given PO
Fairbanks Memorial Hospital
Fairbanks, Alaska, United States
Highlands Oncology Group - Fayetteville
Fayetteville, Arkansas, United States
University of Arkansas for Medical Sciences
Little Rock, Arkansas, United States
Highlands Oncology Group - Rogers
Rogers, Arkansas, United States
Highlands Oncology Group
Springdale, Arkansas, United States
Overall survival
The Kaplan-Meier method will be used to estimate survival distribution for each treatment arm.
Time frame: From randomization to death due to any cause, assessed up to 5 years from randomization
Progression free survival (PFS)
Analysis will consist of estimation of the PFS distribution of each treatment arm via the Kaplan-Meier method and a stratified log-rank test. Additional analyses may consist of estimating the hazard ratio via the Cox proportional hazards model, accounting for other prognostic covariates (and evaluating whether the proportional hazards assumption holds or whether any treatment effect is notably time-varying), and evaluating for potential treatment by prognostic covariate interactions.
Time frame: From randomization to disease progression or death due to any cause, whichever occurs first, assessed up to 5 years from randomization
Incidence of adverse events
Adverse events (AEs) will be graded according to Common Terminology Criteria for Adverse Events version 5.0. Comprehensive summaries of all AEs by treatment arm will be generated and examined.
Time frame: Up to 5 years from randomization
Patient reported outcomes
Measured by the MD Anderson Symptom Inventory - Brain Tumor (MDASI-BT) in patients with newly diagnosed glioblastoma with MGMT promoter methylation. Short-term" and "long-term" MDASI-BT, will be evaluated separately.
Time frame: Up to 5 years from randomization
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