What is my likelihood of developing cancer at some point in life; my nan had breast cancer and her sister had ovarian cancer?

Moderate: With the family breast cancer, there are dna tests which may guide you. Non smoking, regular health checks, good personal habits and choices can reduce risk of dying with cancer even if you do have one develop.

Difficult : There most likely is a higher risk. But main risk factor is your mother and any sisters with breast or ovarian cancer? The best thing you can do is meet with a genetic counselor, however, may not be needed at your age. In addition, any other cancers in the family? Self breast exam important! hope this helps.