The Bank's twice-yearly systemic risksurvey of 68 firms showed that the perceived probability of a future "high impact" event was at its highest level since July 2008.
Of 242 physicians who answered the colon cancer questionnaire, 38 percent went with the survey that carried a higher risk of death but fewer side effects for themselves.
In spite of the new focus on risk and control, the Deloitte survey found that many of the biggest companies had not yet found effective ways to tie pay to risk.