Estrogen and progesterone receptor determination in the papillary cystic neoplasm of the pancreas. With immunohistochemical and ultrastructural observations.

Two cases of papillary cystic neoplasm (PCN) of the pancreas occurring in 18- and 34-year-old women are described. In both, the clinicopathologic features were typical. Immunohistochemical staining for neuron-specific enolase (NSE), S100 protein (S100), alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), and several peptide hormones was negative. Alpha-1-antitrypsin immunoreactivity was prominent, and its significance is discussed. Ultrastructural features were most compatible with partial acinar differentiation. Of the well-described cases of PCN, approximately 95% have occurred in women between the ages of 12 and 35, suggesting a role for hormonal factors in the pathogenesis of this tumor. Consequently, tumor tissue from one patient was assayed for estrogen and progesterone receptors: significant levels of high-affinity receptors were demonstrated for both hormones. Assays for the same receptors in five normal pancreases were negative. This constitutes the first reported measurement of these receptors in the PCN; the results indicate that the PCN may be another hormone-sensitive tumor.