-- Robert Preidt
THURSDAY, Aug. 4 (HealthDay News) -- A map of the genetic
mutations associated with the second most common form of brain
cancer appears to reveal the biological cause of the tumors,
They created the map by sequencing protein-coding genes in seven
samples of tissue from oligodendroglioma tumors, and concentrated
on recurring mutations in two genes (CIC and FUBP1) not previously
associated with those types of tumors.
The genes appear to be the missing link in the "two-hit" theory
of cancer development, the scientists said. That is, each cell in
the body has two copies of 23 chromosomes, representing thousands
of genes that produce protein. If one copy is missing, the other
copy can make up for the lack of protein. But if the second copy
fails, it can become cancerous.
For years, scientists have known that the "first hit" in
oligodendrogliomas appears in the regions of chromosomes 1 and 19,
which fuse together and cause the loss of many genes.
In this study, scientists found mutations in the CIC and FUBP1
genes on chromosomes 1 and 19, which suggests they are the "second
hit" needed to cause cancer.
More mutations in the genes -- which regulate cell-signaling
processes -- were found in an additional 27 tumor samples. Of all
the tumor samples analyzed in the study, two-thirds had CIC and
FUBP1 mutations, said the Johns Hopkins Kimmel Cancer Center
"Whenever we find genes mutated in a majority of tumors, it is likely that the pathway regulated by that gene is critical for the development and biology of the tumor," Nickolas Papadopoulos, an associate professor of oncology, said in a center news release.
The study appears Aug. 4 in the journal
About 20 percent of brain cancers are oligodendrogliomas, which
tend to affect people aged 30 to 45 and most often form on the
frontal lobe in cells that coat neurons. Treatment involves surgery
followed by chemotherapy and radiation. Median survival is 10
The National Brain Tumor Society has more about
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