B. Physiopathology of pancreatic cancer ....................................................................... 23 1.Epidemiology of pancreas cancer ............................................................................................ 23 I) Incidence and prevalence ...........................................................................................................................................................................................................................................................................................Precancerous lesions of the pancreas ................................................................................................................. 27 i) intra-epithelial pancreatic neoplasias ....................................................................................................................................................................................................... and mucing tumors ........................................................................................................................ 29 iii）cystadénom...............................................................................................................................................................................................................................................................................................................................................................................................................................................................PDAC的分子金属分类................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 36Histological characterization of pancreas cancers .............................................................................. 31 i) Adenocarcinoma canal of pancreas (PDAC) ............................................................... 31 II) Immunohistochemical markers of PDAC ........................................................................................... 33 III) Other PDAC subtypes ... 34 (1) Carcinome adénosquameux ..................................................................................................... 34 (2) Carcinome anaplasique ou indifférencié .................................................................................. 34 (3) Carcinome mucineux non kystique ........................................................................................... 34 iv) Caractéristiques du stroma ........................................................................................................... 35 4.