title: Parental cancer as a risk factor for brain tumors (Sweden).
abstract: OBJECTIVE
  We used the nationwide Swedish Family-Cancer Database to analyze the risk for adult (15-61 years) brain tumors in offspring through parental cancer probands. Additionally, cancer risks were assessed among siblings of brain tumor probands.
  
  
  METHODS
  In offspring and parents, respectively, 5,425 and 20,938 cases of brain tumors were diagnosed between the years 1958 and 1996. Groups of offspring were compared by calculating standardized incidence ratios (SIRs) for brain tumors.
  
  
  RESULTS
  Of brain tumor patients, 2.1% had a parent with nervous system cancer; SIRs were 1.7, 2.4, and 2.5 for all brain tumors, astrocytomas, and meningiomas, respectively. Parental endometrial cancer and melanoma were associated with offspring astrocytoma, and parental breast and thyroid cancers with offspring ependymoma and neurinoma, respectively. SIR for sibling nervous system tumors from brain tumor probands was not increased overall but was 2.5 in those diagnosed at ages 15-34 years.
  
  
  CONCLUSIONS
  These data show a familial risk for brain tumors among adults.
authors.affiliation: Department of Biosciences, Novum, Karolinska Institute, Huddinge, Sweden. kari.hemminki@cnt.ki.se
authors.forename: K
authors.initials: K
authors.lastname: Hemminki
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.forename: V P
authors.initials: VP
authors.lastname: Collins
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001932:Brain Neoplasms / Q000175:diagnosis / Q000453:epidemiology* / Q000235:genetics*; D016208:Databases, Factual; D005192:Family Health; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009679:Nuclear Family; D010290:Parents; D010375:Pedigree; D011446:Prospective Studies; D012042:Registries; D018570:Risk Assessment; D012307:Risk Factors; D013548:Sweden / Q000453:epidemiology