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Rinsho Byori. 2001 Jan;49(1):66-70.

[Pathological, cytological and immunohistochemical study of normal-sized ovary carcinoma syndrome].

[Article in Japanese]

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Department of Pathology, Yokosuka Municipal Hospital, Yokosuka 240-0195.


Normal-sized ovary carcinoma syndrome(NOCS) is characterized by diffuse metastatic malignant disease of the abdominal cavity in females, with normal-sized ovaries, and no origin assigned definitively by intraoperative evaluation. To elucidate the characteristics of NOCS arising from ovarian carcinoma, we investigated the immunohistochemical reactivities of keratin, epithelial membrane antigen(EMA), vimentin, and proliferative cell nuclear antigen(PCNA) in 4 cases of ovarian carcinoma with NOCS(NOCS group), including 3 cases of serous surface papillary adenocarcinoma(SSPC) and 1 case of small ovarian primary serous papillary adenocarcinoma(SPC). These cases were compared with 3 cases of ovarian carcinoma without NOCS(non-NOCS group), including 3 cases of SPC. Cytological and histological testing of the NOCS and non-NOCS groups showed the same findings. Similar reactivities for keratin, EMA and vimentin were observed in the NOCS and non-NOCS groups. No significant change of PCNA labeling index between the groups was seen. However, clinical stage of the NOCS group was higher than that of non-NOCS group. It was hypothesized that exposure of cancer cells to peritoneal cavity in ovarian SSPC leads to the spread. In NOCS case arising from small-sized ovarian carcinoma, another factor was thought to be involved, such as genetic alteration, but it is not known.

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