GPs could be routinely testing patients for genetic risk of cancer within five years following a landmark study by Cambridge scientists.
The biggest investigation of its kind ever carried out has greatly multiplied the number of known genetic markers linked to breast, prostate and ovarian cancer.
In future, the results may make it possible to single out individuals with a potentially lethal hand of genetic cards using a simple saliva test.
They can then be monitored closely for the first signs of developing cancer, or - in the most high risk cases - be offered preventative treatment.
Experts believe the cheap and easy tests could be conducted in family doctors' surgeries.
Samples would initially be sent off to laboratory specialists, but eventually GPs could be doing the analysis themselves.
More top news
Thursday night's programme will come live from the Cambridgshire village of Gamlingay for the latest in our look at Community at Christmas.
An inmate has appeared in court to deny the attempted murder of two prison officers.
Concerns over the form of England batsman Alastair Cook are growing after he could only make seven on day one of the Third Ashes Test.