Ovarian cancer may be discovered in CF women more frequently because CF women as a rule get more frequent check ups. They are not forced to forgo their own medical care because kids need braces or some other stuff such as school supplies. Also CF women do not rely on their offspring to take care of them - they have to look out after themselves. Again, doctor visits are more frequent and therefore problems are discovered more often and sooner. Any woman can get ovarian cancer, having kids is not a guarantee against it.
When I was in college, our health professor told us an important detail. Whenever a research is performed, we have to carefully examine the subject being research and the entity sponsoring it. For example, milk industry will generally come out with research results that milk is good for you. Soy milk industry will sponsor the opposite.
I would like to know who paid for the ovarian cancer in CF women research? Gerber? Tutor Time? Kids Я Us? Some other place that profits from babies?