Volume 176, Issue 4 p. 343-352
Original Paper

The prognostic value of oncogenic antigen 519 (OA-519) expression and proliferative activity detected by antibody MIB-I in node-negative breast cancer

Vibeke Jensen

Corresponding Author

Vibeke Jensen

Institute of Pathology, Aarhus Amtssygehus, Denmark

Institute of Pathology, Aarhus University Hospital, Amtssygehuset, Tage Hansens Gade 2, 8000 Aarhus C, DenmarkSearch for more papers by this author
Morten Ladekarl

Morten Ladekarl

Sterological Research Laboratory, University of Aarhus, Denmark

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Peter Holm-Nielsen

Peter Holm-Nielsen

Institute of Pathology, Aarhus Amtssygehus, Denmark

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Flemming Melsen

Flemming Melsen

Institute of Pathology, Aarhus Amtssygehus, Denmark

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Flemming Brandt Sœrensen

Flemming Brandt Sœrensen

University Institute of Pathology, Aarhus Kommunehospital, Denmark

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First published: August 1995
Citations: 79

Abstract

The prognostic value of oncogenic antigen 519 (OA-519) expression and tumour proliferative activity was evaluated in a retrospective series of 118 patients with low-risk breast cancer. Low risk was defined as negative axillary nodes, tumour diameter ⩽50 mm, and no histological evidence of invasion of skin or deep fascia (=T1N0M0 and T2N0M0). The median follow-up time was 104 months (range 5–143 months). Immunohistochemical analysis of OA-519 expression was performed on formalin-fixed, paraffin-embedded tissue. The proliferative activity was estimated using a Ki-67 equivalent monoclonal antibody (MIB-1), which is applicable on formalin-fixed, paraffin-embedded tissue after microwave pretreatment. OA-519 was expressed in about one-third of the tumours and the percentage of proliferating cells (the MIB-1 index) ranged between 1 and 72 per cent (median 17 per cent). Using multivariate Cox analysis, both the MIB-1 index and OA-519 expression were of independent prognostic value (2p⩽0·01), and the combined immunohistological approach may therefore be useful in selecting patients with node-negative breast cancer who might benefit from adjuvant therapy.