Know that Cancer cells are present within everyone to a certain degree, so just part of the normal life experience. If you find the fear is overwhelming you then speak to your doctor, and have every test that is possible carried out at regular diagnostic intervals, so if problems actually do appear they can be dealt with before they become a serious issue. Of course don't smoke, limit alcohol intake, eat healthy foods, limit sun exposure and exercise. Just about everyone in my family, for several generations now, has experienced cancer in one form or another, so I have the regular checks carried out on those that are the most common. I don't fear it but deal with it with it appears and get on with my life in the meantime.