With the company having suggested prostate cancer could boost potential annual peak sales by between 500 million Swiss francs ($464.3 million) and 1 billion, Deutsche Bank analysts said the setback meant 0.5 to 2 percent might need to be come off consensus sales estimates for Roche and 1 to 4 percent from core earnings. Oliver Kaemmerer, an analyst at WestLB, said he was likely to revise down his 2014 sales forecast for Avastin of 9.8 billion francs to nearer 9 billion, given that ovarian cancer was the only new opportunity now left available. Avastin, which works by starving tumours of blood, is already used to treat colon, breast, lung and kidney cancers, and had 2009 annual global sales of 6.2 billion Swiss francs. It is seen as the flagship product for Roche, the world's largest maker of cancer drugs, given its potential to expand in these markets and move into treating new types of cancer