FREQUENT LOSS OF P16 EXPRESSION AND ITS CORRELATION WITH CLINICOPATHOLOGICAL PARAMETERS IN PANCREATIC-CARCINOMA

Expression of the p16 gene product in human primary pancreatic carcino ma (PC) was investigated in paraffin-embedded tissue using a monoclona l antibody against p16 protein, clone G175-105, by means of immunohist ochemistry, and the correlation of results with various clinicopatholo gical parameters was evaluated, All six cases of normal pancreas and a ll but 1 of 20 cases of chronic pancreatitis expressed p16 protein, wh ereas 37.5% (3 of 8) of cystadenomas and 41.9% (26 of 62) of PCs lost p16 expression, There was a significant difference between chronic pan creatitis and PC for frequency of the loss of p16 expression (P < 0.01 ), Moreover, loss of p16 expression in pancreatic malignancy was signi ficantly associated with histological grade (G1 versus G2 and G3, P < 0.01) but not with sex, age, clinical stage, tumor location, or resect ability, The survival period was shorter and metastasis is more likely in those cases that did not show p16 expression than those that did.