Temozolomide Plus Bevacizumab in Supratentorial Glioblastoma in 70 Years and Older Patients With an Impaired Functional Status

Elderly patients aged 65 years and older account for approximately 45% of GBM patients, and this figure is expected to rise concurrently with the aging population of most countries. Unfortunately, few trials have been performed in this setting. In elderly patients with good functional status (KPS >70), radiotherapy (RT) prolongs overall survival (OS) without causing a detriment in quality of life compared with palliative care alone. Recently, it was shown that TMZ could be an alternative to RT. In elderly patients with poor functional status at symptom onset (KPS < 70), RT does not appear to be a satisfactory option in this frail population; however, investigators previously found that TMZ alone was associated with improvements in functional status in 1/3 of cases and appeared to increase survival compared with supportive care alone, especially in methylated MGMT promoter patients.

Bevacizumab (Bev) is an antiangiogenic monoclonal antibody targeting VEGF (vascular endothelial growth factor) that is currently used in recurrent GBM, particularly in combination with alkylating agents. Its effect as first line treatment in combination with TMZ and RT is controversial.

In this study, investigators evaluated the efficacy and safety of the upfront combination of TMZ + Bev as an initial treatment for elderly patients with GBM and impaired functional status (KPS <70).

Inclusion criteria

• Supratentorial Glioblastoma diagnosed by biopsy.
• Patients aged ≥ 70 years
• KPS >30 and < 70
• Life expectancy > or = 8 weeks
• Patients were enrolled at least 14 days after stereotactic biopsy and 28 days after surgical biopsy.
• CT or brain MRI was performed within 4 weeks before treatment to rule out haemorrhage.
• Included to health social security system
• Medical assessment previous to inclusion
• Informed consent form

Exclusion criteria

• Previous treatment with Surgical resection, RT or chemotherapy to the tumor.
• Hemoglobin level < 9 g%
• Absolute neutrophil count < 1500
• Platelet count < 100.000
• ASAT or ALAT levels more than 3 times the upper limit of normal.
• Bilirubin levels more than 2 times the upper limit of normal
• Creatinin more than 1.5 times the upper limit of normal
• Untreated high blood pressure >150/100 mmHg
• Congestive cardiac failure
• Proteinuria > 1 gr/24h
• INR > 1.5 the upper limit of normal
• Recent symptomatic haemorrhage
• History of abnormal wound healing
• Gastrointestinal fistula
• Haemoptysis > grade 2 (NCI-CTC)
• Intracranial abscess
• Coagulation disorder
• Active infection requiring intravenous antibiotics
• Vascular disease (including myocardial infarction, unstable angina, cerebrovascular disease, peripheral arterial or aortic disease) in the previous 6 months
• Malignancy diagnosed in the previous 5 years (except basocellular skin cancer and in situ cervix cancer)
• Allergy to dacarbazine, Bevacizumab, Temozolomide or their excipients, recombinant human monoclonal antibodies, or ovarian cells of Chinese hamsters.