In adult humans, most cancers are carcinomas or adenocarcinomas. These include cancers of the skin, lung, colon, breast, and prostate. Which of the four basic tissue types is involved, and why?
a. Connective tissue: it is found everywhere in the body, and is the only tissue common to the skin, lungs, colon, breasts, and prostate.
b. Epithelial tissue: it is exposed to the environment and is constantly dividing, both factors allowing more opportunity for damage and overcoming growth control mechanisms.
c. Epithelial tissue: it is avascular and composed entirely of cells, both of which inhibit surveillance by the immune system.
d. Connective tissue: cancerous cells can move more freely and spread to other tissues more easily due to the high level of vascularization in connective tissue.
Connective tissue: cancerous cells require high levels of nutrients, and connective tissue is well vascularized.
Answer: b. Epithelial tissue: it is exposed to the environment and is constantly dividing, both factors allowing more opportunity for damage and overcoming growth control mechanisms.
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