Final- Cancers Flashcards
What are classifications of Cancer?
- Non-blood cell (solid tumors
- Blood cell cancers
OR
- Spontaneous
- Virus-associated
What are two types of non blood cell cancers? What are they made up of? Which is MC?
- Carcinomas– MC; epithelial origins
2. Sarcomas– least common; bone, fat, cartilage
What are three types of Blood Cell Cancers? What do they arise from?
- Leukemias– arise from early lymphoid or myeloid cells
- Lymphomas – spread to lymphatic system, swollen nodes
- Myelomas– arise from B cells
Are spontaneous cancers or virus-assoc. cancers MC?
spontaneous cancers
What do Spontaneous cancers result from?
results from exposure over time
What are some environmental links to cancer?
- chimney sweeps– nasal cavity and skin
- chemicals
- radiation- UV and ionizing
- Diet
- normal metabolism
What are some examples of DNA and RNA tumor viruses?
- HPV
- Hep. B
- Epstein-Barr
- Herpes virus
- HTLV
What are the following DNA and RNA tumor viruses assoc. with developing what kind of cancer?
- HPV
- Hepatitis B
- Epstein-Barr
- Herpes virus
- HTLV
- HPV–> STI
- Hepatitis B–> liver CA
- Epstein-Barr–> Burkitt’s lymphoma
- Herpes virus–> Kaposi’s sarcoma
- HTLV–> leukemia
What is the impact of smoking on cancer? what happens if one stops smoking?
- younger you start smokine–> greater risk of CA
- amount of cigarettes a day has increase risk
If quit–> w/in about 10 years have same risk of CA as someone who didn’t ever smoke
Is cancer generally an inherited disease?
no
Is cancer usually due to one thing or multiple events?
due to accumulation of multiple events (progression)
In general, what are some characteristics of CA?
- generally not inherited
- genetic or epigentic changes over lifetime
- progression
- invasion
- metastatses
- CA rare at cellular level
- loss of balance of cell division and death
T/F. Cancer is common at the cellular level.
False– CA is extremely RARE at the cellular level
Does cancer spread?
yes, metastases–> spread to other areas of body and establish secondary tumors
Does cancer invade?
yes, cancer cells proliferate and produce malignant tumors that invade healthy tissue
What are properties of cancer cells?
- do NOT respond to inhibitory influences
- loss of cell signaling and cell cycle
- anchorage independent growth
- grow in absence of stimulatory growth signals
~cancer cells seem immortal
Can cancer develop due to changes in DNA of a cell during lifetime?
Yes– call is genetic or epigenetic
What type of genes encode proteins that restrain cell growth? Do they act dominantly or recessively?
Tumor Suppressor Genes (p53)
act recessively
What type of genes encode proteins that promote the loss of growth control and the conversion of a cell to the malignant state? Do they act dominantly or recessively?
Oncogenes (Ras)
act dominantly
What type of genes encode proteins that have various functions in the cell’s normal activities? Are these normal? What happens if they mutate?
Proto-oncogenes
normal; necessary for cell growth and division–>problem is when it MUTATES–> it turns into oncogenes = BAD
How do some solid tumor evade CTLs?
- tumor cells produce proteins that activate CTLA-4 and PD-1 (which tell Tcell to die)
- mutate rapidly and CTLs may not recognize it
- tumors increase production of Tregs–> TGF-beta, IL-10 (which turn DOWN immune response)
Are CTL’s better at providing protection in blood or tissues, where the solid tumors are?
better in blood
CTLs may not provide best protection against solid tumors
Why may CTLs be more effective to fight blood cancers?
Naive CTLs traffic through blood and lymph coming into DIRECT contact with blood cancers
- blood cancers often express high levels of B7
How can highly active macrophages provide protection?
- direct injection of BCG into tumor causes inflammation and macrophages “attack” tumor
- expression of “unusual” proteins on tumor cells may direct macrophages
