Their importance for communication between breast cancer cells prompted johan skog , a geneticist at harvard medical school in boston , and colleagues to examine microvesicles secreted by glioblastoma , or brain tumor , cells .
The researchers obtained blood stem cells , which are found in bone marrow , from three glioblastoma patients and inserted the gene coding for the mutant p140k into the cells .
Eberhart and colleagues studied glioblastoma cell lines to investigate the effects of a gamma-secretase inhibitor , a medication that blocks the notch receptor , on tumor growth .
In spite of the gravity of his illness diagnosed as glioblastoma , the deadliest form of brain cancer he had insisted on continuing his political life .