chapter 19 - cancer Flashcards
second leadign cause of death in US
cancer
what is cncer
abn cell growth
some way gene lose control of cll growth and reporudftion becomes unstrcutred and excessive
cause tumor or neoplasm
aka neoplasmia
malignant affect structure and consequently function of organs; when cancer cells break away from og sight and spread via blood it is said to metastasize
oncology is study of cancer and phyisican specializing in cancer cases is called an oncologists
cause of cancer
precise unknown but facotrs include
- heredity
-viruses
- environemntal carcinogens (radiation from x-rays, sun, or nuclear waste, certain chemcials ingested in fod or water, chemicals thattouch skin regularly and cetain substances that are breathed in such as tobacco smoke and asbestos
- emotiona stress
- genetic predisposition
carcinogens have effect after prolonged exposure
carcinomas
epithelials cell (cells lining body)
outer layer of skin, menbrae lining digestive tract, bladder, womb, and any duct or tube that goes thorugh organs in body
sarcomas
cancer of soft tissue of body such as muscle, fat, nerves, tendons, blood, and lympgh vessels and other tissues that support surround and protect organs
soft tssue sarcomas are uncomon
can also occur in bone rather than soft tissue and primarily in legs
lymphomas
lymphoid tissue
lymph nodes, bone marrow, spleen, and thymus gland
leukemia
wbc and also affect bone marrow and spleem
classification of cancer
carcinomas
sarcoma
lyphoma
leukemia
skin cancer tpyes
three types: basal cell, squamous cell, melanoma
basal cell carcinoma
most common; affect outer skin layer and cuased by exposure to sunlight
high rish if fair skin, light hair, and blue, green, or gray eyes and spend considerable leisure time in sun
squamous cell carcinoma
squamous cells in upper layer of skin
chronic exposure to sunlight
may also occur where skin has been injured; burns, scars, or long-standing sores
melanoma
most serious and deadliset form of skin cancer and orgiinations in cells that produce the pigment melanin which colors our skin, hair, and skin
majority of melanomas are black or brown but could be skin colore,d pink, red, or purple
what cnacers are overwt and obese ppl higher risk for
breast (in women past menopause), colon, rectum, , endometrium, esophaus, kidney, and ancrease
elevated inflammatory homres like inslin, estrogen, and leptin
viral causes of cancer
epstein-barr: nasopharyngeal cncer, t-cell lymphoma, Hodgkins, gastric carcinoma
hepB - liver cancer (thre is an anticancer vaccine)
kaposi sarcoma - cancerous tumor of connective tissue (associated w AIDS)
herpes
retrovirus
HPV - cervical cancer
___ of all cancers can be prevented by lifestyle chagnes
1/3
1 out of ___ cancer deaths are related to excess body wt
5
approx ___ cancer cases are linkeded to excess bodyfat in US
117000
obesity increases risk for what sseven cancers
colorectal
postmenopausal breast
kidney
pancreastic
endometrium
gallbladder
esophageal cancer
ACS cancer prevention study II found that sitting more than ___ horus a daty can elevate chance of getting cacner
6
foods associated w cancer risk
nitrites in cured and smoked foods like bacon and ham can be changed to nitrosamines (carcinogens) during cooking + increased red meat intake assocatd w tomach and esophaus cancer
high fat diet assocated w cancer of uterus, breast, prostate and colon
salty foods may increase risk of stomach cancer
alc increase colon, rectum, breast, esophaus, mouth and liver cancer
dietary recommendation to prevent cancer
limit consumption of red and processed meats (beef, pork, labs, and game shouod be limited to 18 oz or ess) avoid processm eats like cold cuts, bacom, sausage and hams
limit. onsumption of salty foods
limit alc drinks (2 dialy for men ad 1 daily for women)
what are phyotchemicals
anticarcingenic agents found naturally in plant foods
provide plant w color, aroma, and flavors and protection from infection and predators (pteontial to enchance immune system, slow growth of rate of cancer cells, prevent DNA damage)
examples are flavonoids, phemols, ad indoles
best way to provide body w phytochemicals
whole grains, legumes, nuts, seeds, variety of colorful fruits, and vegetables
recommendation for phytochemicals (food)
2/3 of plate w veg fruits whole grains legumes and nuts w /ess than 1/3 to animal proteins
2.5 cups of veg and 2 cups of fruits and include wide variety esp from cruciferous family, dark-green leafy veg, berries, citrus, and yellow/orange veg