The<unk>  (sometimes stylized as<unk>  was a set of international case-control<unk> es conducted with the aim of determining whether mobile phone use increased the risk of certain tumors, namely, glioma, meningioma, and schwannoma. The<unk>  was conducted by the International Agency for Research on Cancer (IARC) in thirteen different countries, at a cost of $24 million. About fifty scientists worked on the<unk> , which was the largest case-control<unk>  conducted on the association between mobile phones and cancer as of 2014. The<unk> 's results, published in 2010, indicated that mobile phone use did not increase the risk of tumors among most cell phone users, with the possible exception of an increased risk among the 10% of users who used their cell phones the most. In the<unk> , the top 10% of users used their phones 30 minutes/day. Some users reported using their cell phones >5 hours per day, but this was considered implausible at the time of the<unk> . The median usage was less than 2.5 hours per month.
Interphone study
Electronic patient-reported outcome
Subgroup analysis
Platform trial
Natural history study
Academic clinical trial
Community-based clinical trial
Population study