The Interphone study (sometimes stylized as INTERPHONE) was a set of international case-control studies conducted with the aim of determining whether mobile phone use increased the risk of certain tumors, namely, glioma, meningioma, and schwannoma. The study 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 study, which was the largest case-control study conducted on the association between mobile phones and cancer as of 2014. The study'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.