Supplies of a type of BCG used to treat bladder cancer have been completely halted due to a flood at a factory in Canada. The bacterium, which stimulates the immune system to fight cancer, is used on about 6,000 patients a year. In more than half of them it can stop cancer spreading almost indefinitely. But Sanofi Pastuer, which makes the most widely-used product, called Immunocyst, does not expect production to restart before late 2013, according to a letter to doctors from Professor Sir Mike Richards, the NHS cancer ‘csar’. He warned it was now “almost inevitable” that patients would...