Figure 3.

Algorithm for classification of pancreatobiliary versus intestinal type using immunohistochemical markers independently associated with histological type. Optimized immunohistochemical classification (IHC) corresponds to morphological classification in 88 of 113 tumours (78%); i.e. 58 pancreatobiliary tumours and 30 intestinal tumours were correctly identified by immunohistochemical evaluation [positive predictive value for identification of pancreatobiliary versus intestinal histological type was thus 78%, 95% confidence interval (CI) 67, 87; sensitivity was 87%, 95% CI 76, 93, and specificity was 65%, 95% CI 50, 78].