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Even Late-Onset Cancer in Parents Increases Cancer Risk in Offspring

No. 05 | 22/01/2013 | by KT/Sel

Scientists of the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ) have found out that even if a parent gets cancer at an old age, the cancer risk of their offspring increases. Up to now, this association has been known only for cancer cases at earlier ages. The researchers recently published their results in the British Medical Journal (BMJ).

© dkfz.de

Aging is one of the most important risk factors for cancer. With people living ever longer lives, an increasing number of them develop cancer. However, little is known to date about how cancer at advanced age impacts the cancer risk for offspring, called “familial risk”. Dr. Elham Kharazmi and her colleagues compared two groups: cancer patients whose parents were affected by the same cancer and cancer patients whose parents did not have cancer.

The authors based their study on almost eight million entries from the Swedish Family-Cancer Database (SFCD). Comprising twelve million individuals including over one million cancer cases, the SFCD is the largest family cancer registry in the world. Kharazmi and colleagues studied cancer cases from 1961 to 2008. Their study included parents of all ages and their offspring aged between 0 and 76 years.

The scientists concluded that the familial cancer risk is elevated even when a parent is affected by cancer as late as age 70 to 89. Descendants of Swedish parents who develop colorectal cancer between the ages of 70 and 79 years have a 1.9-fold increased risk of developing the disease by age 60. For breast cancer, the risk is elevated 1.8-fold. Even when parents are diagnosed with cancer over age 90, there still is a detectable risk elevation for some types of cancer.

Furthermore, the results confirm an increased risk for descendants of parents affected by cancer at a very young age, i.e. before age 40. Compared to those whose parents were not affected, the risk of developing colorectal cancer before age 60 in these individuals is increased 9.9-fold. The risk of breast cancer is elevated 5.2-fold.

Elham Kharazmi and colleagues assume genetic factors to be the basis of familial clustering of cancer. Their findings add to our knowledge of the genetics of cancer. Family members with a genetic predisposition for cancer may thus avoid known risk factors and have regular screening. The authors plan to include information about diet and lifestyle in future studies.

Familial risk of early and late onset cancer: nationwide prospective cohort study.
Kharazmi E, Fallah M, Sundquist K, Hemminki K.
BMJ. 2012 Dec 20;345:e8076. doi: 10.1136/bmj.e8076.

With more than 3,000 employees, the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ) is Germany’s largest biomedical research institute. DKFZ scientists identify cancer risk factors, investigate how cancer progresses and develop new cancer prevention strategies. They are also developing new methods to diagnose tumors more precisely and treat cancer patients more successfully. The DKFZ's Cancer Information Service (KID) provides patients, interested citizens and experts with individual answers to questions relating to cancer.

To transfer promising approaches from cancer research to the clinic and thus improve the prognosis of cancer patients, the DKFZ cooperates with excellent research institutions and university hospitals throughout Germany:

  • National Center for Tumor Diseases (NCT, 6 sites)
  • German Cancer Consortium (DKTK, 8 sites)
  • Hopp Children's Cancer Center (KiTZ) Heidelberg
  • Helmholtz Institute for Translational Oncology (HI-TRON Mainz) - A Helmholtz Institute of the DKFZ
  • DKFZ-Hector Cancer Institute at the University Medical Center Mannheim
  • National Cancer Prevention Center (jointly with German Cancer Aid)
The DKFZ is 90 percent financed by the Federal Ministry of Education and Research and 10 percent by the state of Baden-Württemberg. The DKFZ is a member of the Helmholtz Association of German Research Centers.

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