Cancer registration planning and policy.

Problems Arising from the Definition Mis-diagnosis It will almost certainly be impossible to obtain information about all cancer patients, since there will be many in whom the disease is diagnosed otherwise. Obviously, if these patients die without post-mortem examination, these errors are unlikely to come to light. Again, many patients may be registered as having cancer who, in fact, have some other disease. Errors of this kind may be rectified because of the course taken by the disease or as a result of further investigations or by postmortem examination.