Author's reply

BMJ 1995; 311 doi: https://doi.org/10.1136/bmj.311.7007.750b (Published 16 September 1995) Cite this as: BMJ 1995;311:750
  1. J Adami, Doctoral student
  1. Department of Cancer Epidemiology, University Hospital, S-751 85 Uppsala, Sweden

    EDITOR,--Peter Sasieni and Veronique Bataille argue that the relative risk after exposure to ultraviolet light should be of the same magnitude for subsequent non-Hodgkin's lymphoma and malignant melanoma for a causal association between ultraviolet light and non-Hodgkin's lymphoma to be plausible and for ultraviolet light to explain part of the increase in the incidence of non-Hodgkin's lymphoma. This argument is problematic, because the size of the relative risks cannot be interpreted in such a simplistic way. Theoretically, if ultraviolet light has a directly causal role in the pathogenesis of malignant melanoma (that is, no other components are needed to generate malignant melanoma …

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