title: [Occurrence of colorectal cancer among parents of patients with this disease].
abstract: In order to investigate the influence of a possible genetic factor on the development of colorectal cancer (KRC), a cohort investigation was carried out among parents of patients with KRC. A total of 1,542 patients participated in the investigation. These patients were under the age of 60 years and registered in The Danish Cancer Register as cases of KRC during the period 1982-1984. 96% of the parents of these patients were identified by means of the administrative registers. The parents were then sought in The Danish Cancer Register for cancer during the period 1943-1986. The incidence rates for the Danish population were employed to calculate anticipated number of cases of KRC among these parents. significantly increased frequencies of KRC were found among both the mothers and the fathers, as the standardised incidence ratio was 1.62 in mothers and 1.87 among fathers. As a Danish investigation of spouses of patients with KRC has not demonstrated any increased frequency of KRC among spouses, it is concluded that this finding indicates a possible genetic factor in the etiology of KRC.
authors.affiliation: Kraeftens Bekaempelse, Cancerregisteret, København.
authors.forename: J O
authors.initials: JO
authors.lastname: Søndergaard
authors.forename: S
authors.initials: S
authors.lastname: Bülow
authors.forename: E
authors.initials: E
authors.lastname: Lynge
mesh_terms: D000328:Adult; D000368:Aged; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000453:epidemiology* / Q000235:genetics; D003718:Denmark / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged
vernacular_title: Hyppigheden af kolorektal cancer blandt foraeldre til patienter med denne sygdom.