TY - JOUR T1 - The utility of a novel antibody in the pathological diagnosis of pancreatic acinar cell carcinoma JF - Journal of Clinical Pathology JO - J Clin Pathol DO - 10.1136/jclinpath-2011-200442 SP - jclinpath-2011-200442 AU - Makiko Yasumoto AU - Masato Hamabashiri AU - Jun Akiba AU - Sachiko Ogasawara AU - Yoshiki Naito AU - Tomoki Taira AU - Masamichi Nakayama AU - Aya Daicho AU - Fumio Yamasaki AU - Kazuhide Shimamatsu AU - Yusuke Ishida AU - Ryohei Kaji AU - Yoshinobu Okabe AU - Osamu Nakashima AU - Koichi Ohshima AU - Manabu Nakashima AU - Michio Sata AU - Hirohisa Yano Y1 - 2012/01/01 UR - http://jcp.bmj.com/content/early/2012/01/06/jclinpath-2011-200442.abstract N2 - Aims Acinar cell carcinomas (ACCs) are rare tumours of the exocrine pancreas accounting for about 1–2% of all pancreatic neoplasms in adults. It is therefore difficult to come across a large number of ACC cases in a single medical institution, and only a few serial studies have been published. Since ACCs present a wide variety of morphological patterns, immunohistochemical analysis is useful. In this study, the authors established a novel monoclonal antibody 2P-1-2-1 by means of a subtractive immunisation method.Methods Immunohistochemical staining was performed using 50 primary pancreatic tumors, including 7 ACCs, 7 neuroendocrine tumours (NETs), 5 solid-pseudopapillary neoplasms (SPNs), and 31 ductal carcinomas and organs other than the pancreas.Results Non-neoplastic acinar cells were stained diffusely, but epithelial cells of the pancreatic duct and the islets of Langerhans were not stained. In pancreatic tumours, all the seven ACCs were diffusely positive for the 2P-1-2-1 antibody. However, no positive staining was found in other pancreatic tumours including NETs, SPNs and ductal adenocarcinomas. The sensitivity and specificity of the 2P-1-2-1 antibody for ACCs were both 100%. In other organs studied, positive staining was observed only in the ectopic pancreas.Conclusions It was shown that the 2P-1-2-1 antibody specifically stained the pancreatic acinar cells and tumours of acinar cell origin, such as ACCs. Although it remains unclear at this time to which proteins the monoclonal antibody 2P-1-2-1 is directed, it is suggested to be useful for the pathological diagnosis of ACCs and for the exclusion of other pancreatic tumours. ER -