I don't mean to take away from the suffering of those who have lost loved ones to the aggressive forms of cancer - it can be devastating - it's just that there are other, less terrifying sides to cancer that you can talk to your daughter about).
My mother died of cancer. That took about 7 years.
I deal with cancer people all the time. Most of the people I see are disabled from the chemotherapy.
Social Security has a listing of the severe cancers that grant automatic disability, basically because they are likely to result in death.
http://www.socialsecurity.gov/disab...0-NeoplasticDiseases-Malignant-Adult.htmI don't have any advice on how to study the cancer issue.