"I collected a database containing 9,491 grants totaling $4.8bn with funding start dates from 2009 to early 2013, by searching the SciVal Funding data base with the term “breast cancer”. That represents over a billion dollar investment per year! By way of context, the annual budget of the National Cancer Institute is around $5bn.
The grants go mostly to US institutions, but also some in other countries. Funding is from public and private sources, mostly US-based. It does not include clinical trials, funding for which is not captured in such public databases."