Biology of cancer study guide
Cancer biology pdf
These changes are accompanied by progressive abnormalities in morphology appearance of the cells. Lecture 4 - Describe the role of imaging in the screening, diagnosis, staging, and treatments of cancer. However, numerous investigators have identified hundreds of common sites. Protein kinases are a family of proteins that act as on-off switches by attaching a phosphate group to particularly enzymes. For many years, viral insertion sites were used to identify possible oncogenes and cancer signaling pathways. A tumor could thus "acquire" its own blood supply by insidiously inciting a network of blood vessels around itself and then growing, in grape like clusters, around those blood vessels, a phenomenon that Folkman called tumor angiogenesis. Women who stopped using oral contraceptives more than 10 years ago do not appear to have any increased breast cancer risk. There are cellular mechanisms that repair defects in DNA, but repair is not always successful. Breast cancer mortality was declining because of improvements in screening mammography , surgery, and adjuvant chemotherapy. This was particularly remarkable, since the genome of Rous sarcoma virus is contained in single-stranded RNA. Tests for the detection of heterozygosity can be helpful for identifying individuals predisposed to retinoblastoma and other malignancies. Genome editing is a far better and new technique to treat cancer.
From National Cancer Institute: Cell phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues closest to where the phone is held.
One mutation in the tumor allows it to incite blood vessels to grow; another mutation within this blood-nourished tumor allows the tumor to survive even in areas of the body with low oxygen.
The video below provides a short visual summary of these events, known as the cell cycle. This causes double-stranded DNA breaks in the targeted gene.
There are several classes of chemicals that tend to be carcinogenic. Defects in apoptosis can also confer resistance to chemotherapy, radiation, and immune-mediated cell destruction.
One of the hallmarks of tumor cells is that they lose their ability to sense the ECM or neighboring cells. At some point, one of these cells experiences another mutation that further increases its tendency to divide; this cell's descendants divide excessively and look abnormal, a condition called dysplasia.
The mutation creates an activated version of ras.
based on 41 review