The causes of cancer are complex and not fully known.However, we do know that having a family history of breast, ovarian or a related cancer can significantly increase the risk of developing breast cancer - including developing the cancer at a younger age.
It is also more likely that people with family members affected by cancer who then develop breast cancer themselves could develop a separate tumour in the other breast following initial treatment.
This is why it's wise for any person with a family history of cancer to receive appropriate investigations and screening that would otherwise be unnecessary if a family history did not exist.This guideline was last updated in 2006. Since then there has been new evidence published and new advances made in a number of clinical areas
More top news
50 five-foot-high Shaun the Sheep sculptures designed by well-known artists and celebs installed across London.
Women, including victims of human trafficking are missing out on care because of confusion over 'health tourists', a charity has warned.
Coalition failures have led to a drop in illegal immigrants being deported and fewer illegal drugs being seized, Yvette Cooper will claim.