What is cancer? how many types of cancers were ever found and recorded?

what are the causes of cancer? why, with our advanced medical technology, we are still unable to cure the same and provide a right dose of vaccine? what's the chances of one making a full recovery from the deadly deasese? what has the WHO done to tackle this issue before we even talk about AIDS?

Cancer develops when cells in a part of the body begin to grow out of control. Although there are many kinds of cancer, they all start because of out-of-control growth of abnormal cells.

Normal body cells grow, divide, and die in an orderly fashion. During the early years of a person's life, normal cells divide more rapidly until the person becomes an adult. After that, cells in most parts of the body divide only to replace worn-out or dying cells and to repair injuries.

Because cancer cells continue to grow and divide, they are different from normal cells. Instead of dying, they outlive normal cells and continue to form new abnormal cells.

Cancer cells develop because of damage to DNA. This substance is in every cell and directs all activities. Most of the time when DNA becomes damaged the body is able to repair it. In cancer cells, the damaged DNA is not repaired. People can inherit damaged DNA, which accounts for inherited cancers. More often, though, a person's DNA becomes damaged by exposure to something in the environment, like smoking.

Cancer usually forms as a tumor. Some cancers, like leukemia, do not form tumors. Instead, these cancer cells involve the blood and blood-forming organs and circulate through other tissues where they grow.

Often, cancer cells travel to other parts of the body where they begin to grow and replace normal tissue. This process is called metastasis. Regardless of where a cancer may spread, however, it is always named for the place it began. For instance, breast cancer that spreads to the liver is still called breast cancer, not liver cancer.

Not all tumors are cancerous. Benign (noncancerous) tumors do not spread (metastasize) to other parts of the body and, with very rare exceptions, are not life threatening.

Different types of cancer can behave very differently. For example, lung cancer and breast cancer are very different diseases. They grow at different rates and respond to different treatments. That is why people with cancer need treatment that is aimed at their particular kind of cancer.

AEROBIC exercise and circuit training should be prescribed to all cancer patients.
The call follows the results of a pilot study which found that women who underwent controlled exercise classes during their treatment for breast cancer were better at fighting the debilitating effects of chemotherapy and radiotherapy.

For more info about cancer and WHO/Cancer please visit:
http://www.who.int/mediacentre/factsheet...

cancer is when a cell mutates and grows out of control.

Cancer-abnormal cells multiplying causing tumours that build up and can spread. Cancer can run in the family and smoking can trigger it.

They don't know much about it at all, unfortunately. One thing is for sure, if there ever is a cure for it, it will not be well known for a very long time, and it will cost a fortune.

http://www.oncolink.upenn.edu/resources/...