Since breast cancer is treatable with proper early detection and as long as the women in my family did not receive a lethal diagnosis that killed them shortly after diagnosis, I would not "not" have children to avoid the diagnosis for them. Especially when cancer treatments are evolving and lifespans of those diagnosed with them are increasing.
I don't have any known risk factors in my family that would prevent me from having children.
The fact is, we are born dying. We all our. Our bodies age from the moment we are born and at some point we will pass on. While I certainly would not want to witness the death of my child--my children could have anything take them from their life sooner than I would like.
If I survived to adulthood and my partner of course did, my child's chances of surviving to adulthood are very good considering their ancestors made it htat far.
I just cannot see altering my life out of fear that something could happen and avoiding joy b/c of the potential for sorrow. To me, it is irratioanl to live that way--and I have lived a very irrational life until treatment for PTSD. So I can imagine the fear that one would feel. But the fear is irrational even if there is a risk that someone will develop a life altering condition. It is simply something that cannot be predicted. I don't get to pick how long my children will live. But I will enjoy them while they are here.