title: [Completeness and quality of baseline data and follow-up in cancer registry--an analysis on the example of colorectal cancer].
abstract: OBJECTIVE
  In Germany, data of cancer patients are recorded not only in epidemiological registers but also in clinical cancer registers. To ensure the networking of all included medical partners, quality control, and clinical research it is necessary that cancer cases are captured more or less completely. The aim of the present study was to compare the data sets of two registers.
  
  
  METHODS
  Data from patients with colorectal cancer from two large surgical clinics in Magdeburg are recorded in two registers - the Clinical Cancer Registry Magdeburg and the Institute of Quality Assurance in Operative Medicine at the Otto-von-Guericke University Magdeburg. Here we compared the data sets in order to check the completeness of data capturing and to determine factors influencing the degree of completeness.
  
  
  RESULTS
  From all patients captured in the Institute of Quality Assurance, 78.9% are found also in the clinical cancer registry. The percentage improves over the course of time, but also depends on diagnostic criteria such as the staging. There are some differences between both registries, explainable by their specific objectives. Particularly, it is demonstrated that incomplete follow-up record may bias estimates of survival rates from registries.
  
  
  CONCLUSIONS
  Ensuring the completeness and correctness of data is a major challenge for cancer registries. It has distinct influence on estimated quality parameters such as survival rates.
authors.affiliation: Institut für Biometrie und medizinische Informatik, Otto-von-Guericke-Universität, Magdeburg.
authors.forename: S
authors.initials: S
authors.lastname: Kropf
authors.affiliation: Institut für Biometrie und medizinische Informatik, Otto-von-Guericke-Universität, Magdeburg.
authors.forename: E
authors.initials: E
authors.lastname: Burger
authors.affiliation: Institut für Biometrie und medizinische Informatik, Otto-von-Guericke-Universität, Magdeburg.
authors.forename: I
authors.initials: I
authors.lastname: Radinski
authors.affiliation: Klinik für Allgemein- und Viszeralchirurgie, Klinikum Magdeburg gGmbH, Magdeburg.
authors.forename: K
authors.initials: K
authors.lastname: Ridwelski
authors.affiliation: Klinik für Allgemein-, Viszeral- und Gefäßchirurgie, Otto-von-Guericke-Universität, Magdeburg.
authors.forename: H
authors.initials: H
authors.lastname: Lippert
authors.affiliation: Klinik für Allgemein-, Viszeral- und Gefäßchirurgie, Universitätsklinikum Jena.
authors.forename: A
authors.initials: A
authors.lastname: Altendorf-Hofmann
authors.affiliation: Institut für Biometrie und medizinische Informatik, Otto-von-Guericke-Universität, Magdeburg.
authors.forename: J
authors.initials: J
authors.lastname: Bernarding
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015982:Bias; D002278:Carcinoma in Situ / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000453:epidemiology* / Q000628:therapy; D005260:Female; D005500:Follow-Up Studies; D046152:Gastrointestinal Stromal Tumors / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008223:Lymphoma / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D008297:Male; D008545:Melanoma / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D008875:Middle Aged; D018358:Neuroendocrine Tumors / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D010466:Perceptual Closure; D012042:Registries / Q000592:standards*; D012107:Research Design / Q000592:standards; D012509:Sarcoma / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D012878:Skin Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000628:therapy; D015996:Survival Rate