The definition of the criteria for inclusion of patients in stage IVB is based on clinical and pathological information (see Chapter 6). None of the patients in this stage underwent a resection. Thus although most of the patients had disease which was too advanced for resection, a proportion were not considered for resection for other reasons. Such patients therefore were not fully evaluated clinically and the true extent of disease was not established. Also included are those patients in whom the diagnosis was made at post mortem.
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