Intended for healthcare professionals

Letters Mobile phones and brain tumours

Updated study contains poor science and should be disregarded

BMJ 2011; 343 doi: (Published 06 December 2011) Cite this as: BMJ 2011;343:d7899
  1. Alasdair Philips, scientific director1,
  2. Graham Lamburn, technical manager1
  1. 1Powerwatch, Sutton, Ely, Cambridgeshire CB6 2QA, UK
  1. alasdair{at}

The update of the Danish cohort study of mobile phone use and cancer risk has the serious flaws present in the original publication.1 2 The first flaw in the update is the correct identification of mobile phone subscribers between 1987 and 1995. This resulted in a participation rate of only 58% of identified early subscribers, with the remaining 42% placed in the “non-exposed” category (which, by the …

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