Anti-malaria drugs being tested against breast cancer

some cancers seem to concentrate iron.

This is similar to malaria parasite. So there's some clinical trials that is trying malaria drugs on cancer. These drugs tend to have good safety profile. They are in cancer trials based on epidemiological and pre-clinical efficacy.

http://clinicaltrials.gov/ct2/results?term=Hydroxychloroquine+breast+cancer&show_flds=Y

http://clinicaltrials.gov/ct2/show/NCT00764036?term=artemisinin+breast+cancer
http://clinicaltrials.gov/ct2/results?term=chloroquine+breast+cancer