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.
Worsening symptoms during brain radiotherapy. Some people find that their brain tumour symptoms get worse for a while after starting radiotherapy treatment. This can be frightening because you may think your treatment hasn't worked and that the tumour is growing.In fact, it is most likely to be due to the treatment.Radiotherapy to the brain causes a short term swelling in the treatment area, which raises the pressure in the brain. Doctors call this oedema. It can make your symptoms worse for a time â for example, causing headaches, feeling sick, or fits (seizures).The swelling does go down, but while you have it your doctor will give you steroid tablets to take. Steroids reduce the swelling.octors call this oedema. It can make your symptoms worse for a time â for example, causing headaches, feeling sick, or fits (seizures). The swelling does go down, but while you have it your doctor will give you steroid tablets to take. Steroids reduce the swelling.