What causes brain tumours?
The short answer is that no-one knows why brain tumours occur. There are many theories, some of which are scientifically sound, others being nothing more than speculation. Here are some of those theories. Please remember that no definitive cause has been found and therefore we should not draw any firm conclusions based on non-factual information:
Arguments for this theory are mostly based on the close association between some congenital syndromes and brain tumours. There is a condition called neurofibromatosis(NF) that is characterised by multiple soft tissue tumours. The abnormal chromosome has been localised to chromosome 22 and 17. Those with NF1 may suffer from tumours anywhere along the visual tract and those with NF2 get tumours of the vestibular nerve. Also, some people with brain tumours have an over-expression of certain growth factors (PDGF) and cancer genes (proto-oncogenes) and a depletion or mutation of tumour suppressor genes (p53). These genes and growth factors are found in many people without cancer.
Ironically, radiation that is given in limited doses to treat patients with malignant tumours, may also cause malignant brain tumours when given in higher doses.
ELECTROMAGNETIC RADIATION (EMR)
The Scandinavians first alerted us to the adverse effects of very low frequency EMR. They showed quite conclusively that people who lived close to high tensile electrical wires were at greater risk of developing cancers, including brain tumours. To extrapolate this data to other electrical appliances may be over-reacting but it is generally accepted that one should try to limit exposure. Mobile phones emit EMR. The International Agency for Research on Cancer (IARC) have classified mobile phones as potentially carcinogenic (Grade 2B). Furthermore, the INTERPHONE study, considered the most convincing to refute the link, actually demonstrated that high usage (>30 minutes/day) was associated with a 2 times higher chance of developing brain cancer on the side of usage.
The scientific community accepts unequivocally that the immune system plays an important role in the genesis and control of any malignancy. The relative importance is disputed. Some people with brain tumours do have deficiencies in their immune system, but the majority are not immunosuppressed. Dr Teo is a strong believer in the importance of keeping the immune system primed. This can be done with exercise, a diet rich in anti-oxidants, positive thought, reduced stress and laughter.