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Another limitation to genetic testing for a hereditary linked cancer, is the variants of unknown clinical significance. Because the human genome has over 22,000 genes, there are 3.5 million variants in the average person's genome.
Hereditary cancer syndromes underlie 5 to 10% of all cancers and there are over 50 identifiable hereditary forms of cancer. [5] Scientific understanding of cancer susceptibility syndromes is actively expanding: additional syndromes are being found, [6] the underlying biology is becoming clearer, and genetic testing is improving detection, treatment, and prevention of cancer syndromes. [7]
Acquired and inherited cancer: Medicare may cover next generation sequencing, a type of genetic test that can diagnose or assess a person’s level of risk for various cancers.
This is often referred to as multigene panel testing because testing simultaneously examines a number of different genes. For example, an individual may have panel testing for a group of genes known to be associated with a particular type of cancer such hereditary colon cancer or hereditary breast and ovarian cancer. [34]
Oncogenomics is a sub-field of genomics that characterizes cancer-associated genes.It focuses on genomic, epigenomic and transcript alterations in cancer. Cancer is a genetic disease caused by accumulation of DNA mutations and epigenetic alterations leading to unrestrained cell proliferation and neoplasm formation.
A genetic blood test of the APC gene exists that can determine whether it is present, and therefore can predict the possibility of FAP. Individuals at risk (due to family links or genetic testing) are usually offered routine monitoring of the intestinal tract every 1–3 years for life, from puberty for FAP and early adulthood for attenuated forms.
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