1 There are over 200 types of cancer.  Anything that may cause a normal body cell to develop abnormally potentially can cause cancer; general categories of cancer-related or causative agents are as follows: chemical or toxic compound exposures, ionizing radiation, some pathogens, and human genetics.
Chemotherapy uses anti cancer (cytotoxic) drugs to destroy cancer cells. For some types of brain tumour you may have chemotherapy after surgery, to try to prevent the tumour from coming back. Chemotherapy is sometimes given with radiotherapy and for some months afterwards to help people to live longer.hemotherapy works very well for some types of brain tumour but it does not work for all of them. You may have some types of chemotherapy in cycles. You have the drugs for a few days every few weeks.
Depending on your specific case, you may benefit from adjuvant therapy, since this additional treatment may reduce the risk of your cancer recurring. Adjuvant therapy is often used after primary treatments, such as surgery or radiation. Adjuvant therapy given before the main treatment is called neoadjuvant therapy. This type of adjuvant therapy can also decrease the chance of the cancer coming back, and it's often used to make the primary treatment â such as an operation or radiation treatment â easier or more effective.