In the quest for a cancer vaccine, Merck KGaA is again stepping into the ring. Vaximm Holding AG, the company's joint venture with a Switzerland's BB Biotech Ventures III, will start testing a therapeutic cancer vaccine in patients next year. The vaccine, VXM01, harnesses the body's immune system to fight cancer by using T-cells to close off the tumor's blood supply. Roche's Avastin also focuses on the tumor's blood supply, but it focuses on eliminating a protein that creates the...