Cancer Essay Research Paper CANCER CAUSES AND

Cancer Essay, Research Paper

CANCER CAUSES AND TREATMENTS.

Tejmeena. Aujla

Biology Coursework

Assessment 1E Communication Skills Assessment

20-02-2001

Cancer Causes and Treatments

Introduction:

This essay is about cancer; it s causes and methods of treatment. I have collected a wide variety of information from a wide variety of sources.

I. What is cancer?

A.

1. TUMOURS-benign or malignant

2. Names of the different types of cancer in different parts of the body

II. Causes

A. What factors cause cancer.

III. Treatments

Conclusion: There are many different types of cancers caused by many different factors. At the moment there is no proper cure but research is continually being carried out to find a cure.

Cancer Causes and Treatments

What is Cancer?

Cancer is a group of many related diseases that begin in cells, the body s basic unit of life.

The body is made up of many types of cells. Normally, cells grow and divide to produce more cells only when the body needs them. This orderly process keeps the body healthy. Sometimes, however, the cells keep dividing when cells are not needed. These extra cells form a mass of tissue, called a growth or TUMOUR.

There are two types of tumours. These can be BENIGN or MALIGNANT.

Benign tumours are NOT cancers. They can often be removed and in most cases never return. Cells from benign tumours don t spread to other parts of the body. They are rarely a threat to life.

Malignant tumours ARE cancer. Cells in these tumours are abnormal and divide without control or order. They can invade and damage nearby tissues and organs. Also, cancer cells can break away from the malignant tumour and enter the bloodstream or the lymphatic system. That is how cancer spreads from the original cancer site to form new tumours in other organs. The spread of cancer is called metastasis.

Leukaemia and lymphoma are cancers that arise in blood forming cells. The abnormal cells circulate in the blood stream and lymphatic system. This may also invade body organs and form tumours.

Most cancers are named from the organ or type of cell in which they begin. E.g. Cancer that originates in the lungs is called lung cancer, and cancer that begins in the cells in the skin know as melanocytes is called melanoma. When cancer spreads (metastasizes), cancer cells are often found in nearby or regional lymph nodes (sometimes called lymph glands). If the cancer has reached these nodes, it means that the cancer cells have spread to other organs, such as the liver, bones or brain. When cancer spreads from its original location to another part of the body; the new tumour has the same kind of abnormal cells and name as the primary tumour. For example, if the lung cancer spreads to the brain, the cancer cells in the brain are actually lung cancer cells. The disease is called metastasis lung cancer (it s not brain cancer).

Possible Causes and Prevention of Cancer.

The more that is learnt about what causes cancer, the more likely it is that ways will be found to prevent it. In the laboratory scientists explore possible causes of cancer and try to determine exactly what happens in the cells when they become cancerous. Researchers also study patterns of cancer in the population to look for risk factors, conditions that increase the risk that cancer might occur. They also look for protective factors, things that decrease the risk.

Cancer is not contagious. It develops over time. It is a result of a complex mix of factors related to life style, heredity, and environment. A number of factors that increase a person s chance of developing cancer have been identified. Most types of cancer are related to the use of tobacco, what people eat and drink and exposure to ultraviolet (UV) radiation from the sun, and to a lesser extent, exposure to cancer causing agents (carcinogens) in the environment and the work place. Some people are more sensitive than others to certain factors that cause cancer.

Still, most people who get cancer have none of the known risk factors. And most people who do have risk factors don t get the disease.

Some cancer risk factors can be avoided. Other s such as inherited factors are unavoidable, but it is helpful to be aware of them.

These are some of the factors that increase the likelihood of cancer:

Tobacco. Smoking tobacco, using smokeless tobacco, and begin regularly exposed to environmental tobacco smoke are responsible for one-third of all cancer deaths in the USA each year. Tobacco use is the most preventable cause of death in this country.

Smoking accounts for more than 85% of all lung cancer deaths. For smokers, the amount of tobacco smoked each day, the number of years they have smoked, the type of tobacco product, and how deeply they inhale. Overall for those who smoke one packet a day, the chance of getting lung cancer is about 10 times greater than for non-smokers. Cigarette smokers are more likely than non-smokers to develop several other types of cancer, including oral cancer and cancers of the larynx, oesophagus, pancreas, bladder, kidney, and cervix. Smoking may also increase the chances of developing cancer of the stomach, liver, prostate, colon, and rectum. Th

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