Some sports medicine specialists are taking a stand against overreliance on M.R.I.’s, saying they are easily misinterpreted and can result in misdiagnoses and unnecessary, even harmful, treatment. Some physicians are telling patients not to get PSA tests and there is a heated debate on whether to treat prostate cancer in some patients or just leave it alone. In the meantime an international survey of cancer doctors shows many question U.S. health advisers’ 2010 rejection of Roche’s drug Avastin to treat advanced breast cancer. What is an empowered patient to do think or do with all this information ?