HP 330 Lecture 1 Material: What is Cancer?
HP 330 Lecture 1 Material: What is Cancer? HP 330
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This 1 page Class Notes was uploaded by Sydney Brummett on Saturday September 24, 2016. The Class Notes belongs to HP 330 at Wichita State University taught by Dr. Paul Danner in Fall 2016. Since its upload, it has received 49 views. For similar materials see Cancer: Perspectives and Controversies in Health Professions at Wichita State University.
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Date Created: 09/24/16
August 23, 2016 What is Cancer? • General name for a group of more than 100 diseases • Starts as abnormal cells that grow out of control • There are trillions of normal cells in the human body o Cells grow, divide and die in an orderly fashion o Early in life, normal cells divide faster in order for a person to grow o As adults, cells divide only to replace worn-out or dying cells o Cancer cells arise when a cell’s DNA is damaged o Normal cell – when DNA is damaged – is repaired or dies o In cancer cells – it is not repaired and doesn’t die § The new cells that are replicated from this cell have the same abnormal DNA as the original defective cell • Most damage in cells is caused when they are reproducing or something in the environment (chemicals, smoke, radiation, sun exposure) damages them • Rare to know what caused any one person’s cancer • In many cases, cancer cells form tumors • Some cancers, like leukemia, involve blood and blood-forming organs and circulate through other tissues where they grow • Cancer cells travel to other parts of the body and form new tumors o Tumors replace normal tissue o Process of spreading is called metastasis • No matter where cancer spreads – it is named by where it started • Different types behave differently o Ex. Lung cancer vs. skin cancer, slow vs. fast • Grow at different rates and respond to different treatments • Treatment is aimed at the particular kind of cancer • Not all tumors are cancerous (benign) o Can cause problems – grow large and press on healthy organs and tissues o But cannot invade other tissues o Can’t spread to other parts of the body • Half of all men and 1/3 of all women in the US will develop cancer during their lifetime • Millions are living with or have had cancer • Risk of developing can be reduced by changes in lifestyle o Ex: exercise, non-smoker, limiting time in sun, healthy eats • Screening test: to be found early as possible • Earlier cancer is found and treated, better chances are for living many years
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