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Objective To investigate the relationship between neuroendocrine differentiation in ovarian mucinous tumors and its genesis Methods A morphologic study of seventy three cases of ovarian mucinous tumors (32 benign, 20 borderline, 21 malignant) using immunohistochemical and immunohistochemical/histochemical double staining techniques Results The study showed that in tumors of benign, borderline and malignant types, the incidence of chromogranin A (CgA) positive cells was 62 5%, 75%, 76% and that of 5 hydroxytryptamine (5 HT) positive cells was 31 3%, 40% and 39%, respectively Neuroendocrine cells (NEC) were not evenly distributed in any tumor In four cases of the benign tumors, the number of CgA positive cells was more than 30 percent, localizing between the glandular basement membrane and the mucinous epithelial cells, with many intermediate cells containing both CgA and periodic acid schiff (PAS) positive granules Conclusion The occurrence of both neuroendocrine and exocrine granules within the same cell has been previously described as “intermediate” in pancreatic hyperplasia, pancreatic tumors and lung signet ring cell carcinoids This has not previously been observed in benign ovarian mucinous tumors Finding both endocrine and exocrine granules within a single cell seems to indicate a histogenetic relationship between the ovarian endocrine and exocrine cells The four cases of the benign tumors might be originated from a common stem cell, such as the so called amphocrine cell The relationship between these four tumors and neuroendocrine differentiation in ovarian mucinous tumors needs to be further clarified
Objective To investigate the relationship between neuroendocrine differentiation in ovarian mucinous tumors and its genesis Methods A morphologic study of seventy three cases of ovarian mucinous tumors (32 benign, 20 borderline, 21 malignant) using immunohistochemical and immunohistochemical / histochemical double staining techniques Results The study showed that in tumors of benign, borderline and malignant types, the incidence of chromogranin A (CgA) positive cells was 62 5%, 75%, 76% and that of 5 hydroxytryptamine (5 HT) positive cells was 31 3%, 40% and 39%, respectively Neuroendocrine cells (NEC) were not evenly distributed in any tumor In four cases of the benign tumors, the number of CgA positive cells was more than 30 percent, localizing between the glandular basement membrane and the mucinous epithelial cells, with many intermediate cells containing both CgA and periodic acid schiff (PAS) positive granules Conclusion The occurrence of both neuroendocrine and exocrine granules within the same cell has been previously described as “intermediate” in pancreatic hyperplasia, pancreatic tumors and lung signet ring cell carcinoids This has not previously been observed in benign ovarian mucinous tumors Finding both endocrine and exocrine granules within a single cell seems to indicate a histogenetic relationship between the ovarian endocrine and exocrine cells The four cases of the benign tumors might be originated from a common stem cell, such as the so called amphocrine cell The relationship between these four tumors and neuroendocrine differentiation in ovarian mucinous tumors needs to be further clarified