Solar ultraviolet radiation is not a major cause of primary cutaneous non-Hodgkin's lymphoma: Fig 1

Editor—Ultraviolet radiation is known to cause cutaneous malignancies such as squamous and basal cell carcinoma and melanoma. It has been hypothesised that ultraviolet radiation may also increase the risk of non-Hodgkin's lymphoma.1 As evidence exists that specific local factors are important in the aetiology of non-Hodgkin's lymphomas at certain extranodal sites—for example, Helicobacter pylori infection is associated with primary gastric lymphoma but not with lymphomas at other sites2—I investigated the relation between the incidence of primary cutaneous non-Hodgkin's lymphoma and …