Since we seem to be focused on cancer for the moment, here is an examination of the history of slow progress towards cancer vaccines from the LEF News: "Twenty years ago, when people announced immunology would conquer cancer, people didn't realize how little they knew about the immunology of cancer ... For 20 years, scientists have dreamed of creating vaccines that teach the body to destroy tumors. Yet after hundreds of clinical trials, not a single vaccine has been approved to treat cancer. Yet everybody is still trying. There are at least six cancer vaccine trials planned or under way in South Florida, and more than 100 other trials around the country. Their goal is not to prevent cancer, but to treat it -- to stimulate the body to attack cancers of the skin, prostate, pancreas, breast and lungs, to name a few."