For example, leading brain tumor researcher, Dr. Lennart Hardell in Sweden, in December 2014, called for an upgrade to a Group 1 Carcinogen, saying:2
"After that meeting supportive evidence has come from e.g. the French CERENAT study and also our recent publication on glioma.
An increased risk for acoustic neuroma associated with use of wireless phones was published by our research group after the meeting giving pooled results of our study periods 1997 to 2003 and 2007 to 2009.
Also other studies have reported similar findings. We evaluated the Hill viewpoints on association and causation used in the 1960s in the debate on lung cancer risk among smokers.
Using these viewpoints our summary was that RF-EMF exposure should be a Group 1 carcinogen according to IARC criteria. There is now a petition to support that notion aiming at alerting IARC to classify such exposure to cause human cancer."