Immunohistochemical characterization of a monoclonal antibody detecting an endometrioid ovarian cancer-associated antigen
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The monoclonal antibody FEN-1 specifically targets endometrioid ovarian cancer-associated antigens without cross-reacting with endometriosis, normal ovary, or other tumor types, supporting its use in diagnosing nonmucinous ovarian carcinomas.
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by qwen3.7-flash, 2026-08-25
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The researchers developed a murine monoclonal antibody designated FEN-1 by immunizing mice with an antigen purified from endometrioid ovarian cancer ascites. Immunohistochemical analysis demonstrated that this IgG3 antibody specifically reacts with 100% of endometrioid ovarian cancers containing adenoacanthoma in paraffin-embedded tissues. The study explicitly noted that the antibody showed no reactivity against endometriosis, normal ovary, normal endometrium, or various other tumor types, confirming its specificity for the target malignancy. This paper is centrally about endometriosis — specifically, it cites endometriosis as a condition where the tested antibody shows no cross-reactivity, thereby helping to distinguish endometrioid ovarian carcinoma from benign endometriotic tissue.
Abstract
Murine monoclonal antibody FEN-1 was derived by immunizing Balb/c mice with an affinity-purified endometrioid ovarian cancer-associated antigen recovered from ascites-derived immune complexes. Splenic lymphocytes from the immunized mouse were fused with the myeloma cells SP2/0-AG14 in the presence of PEG 1500. The hybrid cultures were screened for production of immunoglobulins reactive with an extract preparation of an endometrioid ovarian tumor by enzyme-linked immunosorbent assay and flow cytometry. One of the hybrids secretes a monoclonal antibody of the IgG3 subtype designated FEN-1, which reacts with 100% of endometrioid ovarian cancer containing adenoacanthoma by indirect immunoperoxidase on paraffin-embedded tissue. No detectable levels of antigen were found in squamous metaplasia associated with nonendometrioid tumors, and no reactivity occurred against endometrial adenocarcinomas, endometriosis, or normal ovary and endometrium. The antibody does not cross-react with mucinous tumors, nonepithelial tumors of the ovary, or gastrointestinal tissue. This antibody may be used as an aid in the diagnosis of nonmucinous ovarian carcinomas by immunohistology.
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Immunohistochemical Characterization of a Monoclonal Antibody Detecting an Endometrioid Ovarian Cancer-Associated Antigen
- Francesca R. Giancotti
- Brent H. Dorsett
- Kyung Tai Kim
- Harry L. Ioachim
- Hugh R. K. Barber
Summary:
Murine monoclonal antibody FEN-1 was derived by immunizing Balb/c mice with an affinity-purified endometrioid ovarian cancer–associated antigen recovered from ascites-derived immune complexes. Splenic lymphocytes from the immunized mouse were fused with the myeloma cells SP2/0–AG14 in the presence of PEG 1500. The hybrid cultures were screened for production of immunoglobulins reactive with an extract preparation of an endometrioid ovarian tumor by enzyme-linked immunosorbent assay and flow cytometry. One of the hybrids secretes a monoclonal antibody of the IgG3 subtype designated FEN-1, which reacts with 100% of endometrioid ovarian cancer containing adenoacanthoma by indirect immunoperoxidase on paraffin-embedded tissue. No detectable levels of antigen were found in squamous metaplasia associated with nonendometrioid tumors, and no reactivity occurred against endometrial adenocarcinomas, endometriosis, or normal ovary and endometrium. The antibody does not cross-react with mucinous tumors, nonepithelial tumors of the ovary, or gastrointestinal tissue. This antibody may be used as an aid in the diagnosis of nonmucinous ovarian carcinomas by immunohistology.
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Condition tags
endometriosis
MeSH descriptors
Antibodies, Monoclonal
Antibodies, Monoclonal
Antibodies, Monoclonal
Antibodies, Monoclonal
Antigens, Neoplasm
Immunohistochemistry
Immunohistochemistry
Ovarian Neoplasms
Animals
Animals
Antigens, Neoplasm
Antigens, Neoplasm
Antigens, Neoplasm
Endometrium
Endometrium
Enzyme-Linked Immunosorbent Assay
Enzyme-Linked Immunosorbent Assay
Female
Female
Flow Cytometry
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Source provenance
- europepmc
- last seen: 2026-10-17T06:09:56.316927+00:00
- pubmed
- last seen: 2026-10-08T21:09:27.188120+00:00
- unpaywall
- last seen: 2026-05-14T19:30:52.867331+00:00
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Courtesy of the U.S. National Library of Medicine