principles of oncology pt 1 Flashcards
how can a tumor develop?
- Unregulated cell division
- Avoidance of cell death
- Tissue invasion
- The ability metastasize
cancer is the ___ leading cause of death in the US
second
what are the 4 most common cancers
- lung
- colon
- breast
- prostate
The most significant risk factor for cancer overall is ?
age
2/3 of all cases occur in those older than age 65 years
(as we get older, the chances of having cancer increases significantly)
Cancers are more often deadly in what race
african americans
what is MC cancer death
lung cancer
what are the burdens of cancer
- cost
- physical morbidity
- emotional distress
- reduction in quality of life
The chance that someone will develop cancer in response to a environmental exposure depends on ?
- how long of exposure
- how often of exposure
- Exposure to certain environmental factors (including diet, hormones)
- Genetic makeup
- Age and gender
Improved understanding of carcinogenesis has allowed for:
- specific interventions - reduces mortality by preventing cancer in those at risk
- Effective screening - early detection of cancer
prevention of cancer concerns for what factors
identification and manipulation of:
- biologic
- environmental
- social
- genetic
factors
what is the primary prevention of cancer
healthy lifestyle - avoid carcinogen exposure and promote health
what is the focus of primary cancer prevention
prevent a cancer from ever developing or to delay the development of a malignancy
what does primary cancer prevention look like with particularly high risk pt
may include the use of chemopreventive agents or prophylactic surgery
what is the MC preventable cause of cancer death
tobacco
> 80% of lung cancer cases occur in smokers
why are light- and low-tar cigarettes not safer?
smokers tend to inhale them more frequently and deeply
Any strategy for cancer control must include the goal of
markedly reducing, if not eliminating, tobacco use
what is secondhand or passive smoke
Environmental tobacco smoke that cause lung cancer and other cardiopulmonary diseases in nonsmokers
what type of tobacco that when smoked daily can double the risk for oral and esophageal cancers
cigars
3-4 cigars daily can increases the risk of oral cancers and esophageal cancer more than ?
eightfold and esophageal cancer fourfold
what tobacco product is linked to dental caries, gingivitis, oral leukoplakia, and oral cancer
smokeless tobacco
what type of cancer is linked to carcinogens in tobacco dissolved in saliva and swallowed
esophageal cancer
what type of primary prevention is associated with reduced risk of colon and breast cancers
physical activity
what other disease shows an increased risk of cancer
obesity
increases as body mass index increases to more than 25 kg/m2.
what type of diet increases risk for cancers of the breast, colon, prostate, and endometrium
high fat
(Many studies have since failed to correlate cancer risk with high fat diet, but it is wise to avoid)
what type of diet is associated with a reduced risk of colonic polyps and invasive cancer of the colon
dietary fiber
how does alcohol affect the risk of cancer
- increased risk of cancers of the mouth, throat, liver, voice box, and esophagus, and stomach
- There is evidence for an increased risk of breast cancer
the early detection and treatment of subclinical, asymptomatic, or early disease in individuals without obvious signs or symptoms of cancer
secondary prevention
goal of secondary prevention
- identifying people who are at risk for developing malignancy
- implementing appropriate screening recommendations based on the risk assessment
screenings including physical examinations, self-examinations, radiologic procedures, laboratory tests
are examples of what type of prevention
secondary
purpose of screenings
early detection in asymptomatic individuals, with the goal of decreasing morbidity and mortality
A screening tests accuracy is described by:
- Sensitivity - proportion of persons with the disease who test positive in the screen
- Specificity - proportion of persons without the disease that test negative in the screening test
- Positive predictive value - proportion of persons who test positive that actually have the disease
- Negative predictive value - proportion testing negative that do not have the disease
what cancers have screenings that are more beneficial for certain age groups
- cervical
- colon
- prostate
- breast
what screening may be beneficial depending on age and smoking history
lung cancer screening
Yearly mammograms are recommended starting at age ?
40
for Colorectal Cancer and Polyps
Beginning at age 45, both men and women should follow one of these testing schedules:
- Tests that find polyps and cancer
- Flexible sigmoidoscopy every 5 years
- Colonoscopy every 10 years
- Double-contrast barium enema every 5 years
- CT colonography (virtual colonoscopy) every 5 years - Tests that primarily find cancer
- Yearly fecal occult blood test (gFOBT)
- Yearly fecal immunochemical test (FIT) every year
- Stool DNA test (sDNA)