title: Non-Hodgkin's lymphoma and other cancers among a cohort of patients with systemic lupus erythematosus.
abstract: OBJECTIVE
  To investigate whether systemic lupus erythematosus (SLE) is associated with non-Hodgkin's lymphoma or other malignant neoplasms.
  
  
  METHODS
  Data on a cohort of 1,585 patients with SLE from the nationwide Danish Hospital Discharge Register were linked to information in the Danish Cancer Registry to determine the occurrence of cancer during up to 15 years of followup. The expected number of cancers was calculated from accumulated person-years and national cancer incidence rates.
  
  
  RESULTS
  There was a significant excess of non-Hodgkin's lymphoma among the SLE patients, based on 8 cases observed against 1.5 expected (relative risk [RR] 5.2, 95% confidence interval 2.2-10.3). In addition, a significantly increased RR was found for cancer of the lung (RR 1.9; n = 15), the liver (RR 8.0; n = 5), and the vagina/vulva (RR 5.7; n = 3).
  
  
  CONCLUSIONS
  There seemed to be a positive association between SLE and non-Hodgkin's lymphoma. Other cancers with a possible virus-related etiology, such as liver and vaginal/vulva cancer, were also observed in excess. In addition, there was an indication of an increased risk of lung cancer among patients who were hospitalized for SLE.
authors.affiliation: Danish Cancer Society, Copenhagen, Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Mellemkjaer
authors.forename: V
authors.initials: V
authors.lastname: Andersen
authors.forename: M S
authors.initials: MS
authors.lastname: Linet
authors.forename: G
authors.initials: G
authors.lastname: Gridley
authors.forename: R
authors.initials: R
authors.lastname: Hoover
authors.forename: J H
authors.initials: JH
authors.lastname: Olsen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008180:Lupus Erythematosus, Systemic / Q000150:complications*; D008228:Lymphoma, Non-Hodgkin / Q000150:complications*; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications*; D012042:Registries; D012306:Risk