Varian Medical Systems ($VAR) soared the most it has in two years after an analyst said Siemens AG ($SI) planned to "selectively exit" radiation therapy. "Siemens has been losing share in this market for years to both Varian and Elekta, so the news does not come as a complete surprise," JPMorgan Chase analyst Tycho Peterson wrote in a research note, as quoted by Bloomberg. "The exit should accelerate additional share shift and could provide upside to Street estimates." Item