What are three ways which cancer is treated?

Get radiation treatments. It kills off all the cells around the cancer, and hopefully, it gets the bad ones.

At a cellular level, cancer can be explained rather easily. Bascially what happens is that two particular genes in one of the millions of cells you have in your body have a malfunction. There is a gene in your cells that controls cell growth and a gene that basically tells your genes when to stop multiplying. What happens is that the gene that controls cell growth and division (making new cells) gets jammed in the "ON" position, making cells without stopping. Then the gene that tells the cell to stop making new cells gets jammed in the "OFF" position and you have new cells being made constantly without being stopped, eventually making a tumor of some sort.

So this can be treated either with radiation treatment, or medically prescribed drugs. There are other forms of cancer that need to be cured in other ways though.

Answer

In answering this question one needs strict definition of what is meant by the term "cellular". Normally this term is used to descirbe the components of the cell. There can be very little difference between "normal" and cancerous cells, however high grade tumours tend to show changes in their cells which can be picked up by trained histologists changes such as diskaryotic cells. Using these changes a surgeon can remove the tissues (made from cells) which have become cancerous and if possible a certain amount of the surrounding tissue where the cellular changes maybe occurring but are not yet visable. If the cancer is judged to be of a high grade then lymph node removal from the area may also be considered as the cells made have spread (metastasis). Histology of the cancer can give you information about the prognosis and be used to determine the best course of treatment. I would class anything beyond histology as not true cellular Biology.

The term cellular can be used more loosly to refer to anything pertaining to the cell. The loose definition would include genetic and biochemical using this definition all cancer treatments are designed to remove or kill cancerous cells. Chemical methods are designed to target rapidly dividing cells and so have some side effects such as killing the rapidly dividing cells which make hair.

To find a treatment for cancer scientist look for differences between cancerous and non-cancerous cells. These differences will be very slight, they have to be so small as to not be detected by the patients immune system. Some research is being put into looking at using antibodies to target cancerous cells which can then be tagged with a drug to kill the cell.