Researchers are fine-tuning an experimental breast cancer vaccine » 9/15/08 10:40am 9/15/08 10:40am that may help eliminate 20 to 30 percent of breast cancers. The vaccine - tested in mice - eliminated tumors from HER2-positive cancer, a type of cancer that accounts for 20-30% of breast cancers. The vaccine even worked to eliminate HER2 tumors that…