The statistical links between allergies and specific cancers continue to be reinforced and this paper finds that risk of glioma is reduced in those with a history of allergy. The lack of variation of protection with cancer type leads us to the tentative view that there would be unlikely to be an effect [protective or aggravating] of occupationally acquired allergy in the absence of atopy.
Evidence from:
MJ Schoemaker et al. Int. J. Cancer (2006) Vol.119 p 2165–2172
“History of allergies and risk of glioma in adults”
It is tempting to propose that allergies have the effect of increasing the ability of the immune system to recognise, and eliminate, brain tumours.
Further detail: