=====Atopic disorder=====
There was no association between atopic conditions and risk of all [[brain tumor]]s combined or of [[glioma]] in particular. Stratification on current or past atopic conditions suggested the possibility of reverse causality, but may also the result of random variation because of small numbers in subgroups. In addition, an ongoing [[tumor]] treatment may affect the manifestation of atopic conditions, which could possibly affect recall when reporting about a history of atopic diseases. Only a few studies on atopic conditions and pediatric brain tumors are currently available, and the evidence is conflicting
((Shu X, Prochazka M, Lannering B, Schüz J, Röösli M, Tynes T, Kuehni CE, Andersen TV, Infanger D, Schmidt LS, Poulsen AH, Klaeboe L, Eggen T, Feychting M. Atopic conditions and brain tumor risk in children and adolescents--an international case-control study (CEFALO). Ann Oncol. 2014 Apr;25(4):902-8. doi: 
10.1093/annonc/mdu048. Epub 2014 Mar 7. PubMed PMID: 24608192.)).