All hereditary cancers are different. The risks of passing on a faulty gene that increases the risk of a cancer can be as high as 1 in 2 ( 50%) but it can be lower too.
The risk of cancer varies. Talking to a genetic counsellor will help you to know: if the cancer in your family is hereditary, if there is a faulty gene that can be identified and what your chances of developing cancer may be.
Sometimes the chance of developing a hereditary cancer is as high as 80 % sometimes it is as low as 1%. This chance can be affected by the specific gene, your age, your diet, whether you are a man or a woman amongst other factors.