Glioblastomas are the second most prevalent form of brain cancer (after Meningiomas). The cancers are malignant and highly aggressive, and are hard to treat effectively (either with drugs, surgery of radiotherapy). It's estimated that more than 20,000 cases worldwide occur each year.
The cause of 95% of glioblastomas are unknown (the other 5% arising from low-grade Astrocytoma).
There are suggestions that glioblastomas might be linked to chemical exposure (pesticides etc), due to viral infections (HHV-6 etc), caused through diet, exposure to electromagnetic fields (or x-rays etc) or via genetic predsiposition.
Further info . American Brain Tumor Association
Also see :
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