The annual national cost of informal caregiving for cancer patients is an estimated $1 billion.
Hayman, James A., Kenneth M. Langa, Mohammed U. Kabeto, Steven J. Katz, Sonya M. DeMonner, Michael E. Chernew, Mitchell B. Slavin, and A. Mark Fendrick. Estimating the Cost of Informal Caregiving for Elderly Patients with Cancer. Journal of Clinical Oncology. 2001; 19(13): 3219-25. http://www.jco.org/cgi/content/abstract/19/13/3219