dr. eric winer: we really need an answer. emily: dr. eric winer is the director of the breast oncology program at dana farber and one of the doctors who successfully appealed to the u.s. defense department for funding. dr. winer: if aspirin isn't useful in preventing recurrence, we need to know that. if it's useful, then we desperately need to know it. emily: that's because aspirin is not only widely available. it's cheap. a year's supply costs just $6. dr. winer: at a time when the cost of medical care and specifically cancer care is escalating, aspirin is a pretty inexpensive drug. emily: and if the study confirms what researchers hope it will, aspirin could have an enormous impact, saving 10,000 lives per year in the u.s. and 75,000 in dr. winer: the sooner we know it, the better. emily: doctors caution don't start taking aspirin until researchers have time to collect and evaluate the results. though the side effects are generally minor, they could be major in some people. it's still possible aspirin could have no effect at all. emily