A new study of more than 25,000 men has uncovered four new genetic variants associated with increased risk of testicular cancer.
Testing for these variants combined with all 21 previously identified using genetic sequencing identified men with a 10-fold higher risk of testicular cancer than the population average.
The research, led by scientists at The Institute of Cancer Research, London, is the largest study to date of the genetics of testicular germ cell tumours - the most common cancer in young men.