Volume 130, Issue 5 pp. 1120-1127
Early Detection and Diagnosis

Nuclear HER3 is associated with favorable overall survival in uveal melanoma

Eric Trocmé

Eric Trocmé

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

Ophthalmic Pathology and Oncology Service, St Erik's Eye Hospital, Stockholm, Sweden

E.T., D.M. and C.C.J. contributed equally to this work

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Dimitrios Mougiakakos

Dimitrios Mougiakakos

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

E.T., D.M. and C.C.J. contributed equally to this work

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C. Christian Johansson

C. Christian Johansson

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

E.T., D.M. and C.C.J. contributed equally to this work

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Charlotta All-Eriksson

Charlotta All-Eriksson

Ophthalmic Pathology and Oncology Service, St Erik's Eye Hospital, Stockholm, Sweden

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Mario A. Economou

Mario A. Economou

Ophthalmic Pathology and Oncology Service, St Erik's Eye Hospital, Stockholm, Sweden

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Olle Larsson

Corresponding Author

Olle Larsson

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

Olle Larsson, CCK R8:04, Karolinska Hospital, SE-17176 Stockholm, Sweden, Tel.: +46 8 517 70366

Yingbo Lin, CCK R8:04, Karolinska Hospital, SE-17176 Stockholm, Sweden, Tel.: +46 8 517 75242,

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Stefan Seregard

Stefan Seregard

Ophthalmic Pathology and Oncology Service, St Erik's Eye Hospital, Stockholm, Sweden

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Rolf Kiessling

Rolf Kiessling

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

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Yingbo Lin

Corresponding Author

Yingbo Lin

Department of Oncology and Pathology, Cancer Center Karolinska, Karolinska Institutet, Stockholm, Sweden

Olle Larsson, CCK R8:04, Karolinska Hospital, SE-17176 Stockholm, Sweden, Tel.: +46 8 517 70366

Yingbo Lin, CCK R8:04, Karolinska Hospital, SE-17176 Stockholm, Sweden, Tel.: +46 8 517 75242,

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First published: 11 April 2011
Citations: 17

Abstract

HER3 is a member of the epidermal growth factor receptor (EGFR) family and is expressed in several types of cancer. Both the cytoplasmic and nuclear appearances of the receptor have been reported. Here, we investigate the expression and subcellular distribution of HER3 in uveal melanoma (UM) cells and tissues and its potential impact on clinical outcome of patients. Paraffin-embedded samples from 128 consecutive UM patients, enucleated without alternative treatment on UM diagnosis, were evaluated for HER3 using immunohistochemistry. Immunoreactivity was scored for frequency, intensity of positive cells, and subcellular distribution. The results were correlated with the established clinicopathological parameters using univariate and multivariate statistical analyses. HER3 expression was shown in 70% of the cases (89/128). This contrasts with the other EGFR family receptors (EGFR, HER2 and HER4) that are infrequently expressed in UM. Surprisingly, HER3 was found to be localized solely in the cell nuclei in 56 cases. The remaining 33 HER3 positive cases showed diffuse distribution (cytoplasmic ± nuclear). Nuclear HER3 was independently correlated with a more favorable overall survival (p = 0.043 and hazard ratio = 0.618) compared to cases with diffuse and/or no HER3. Nuclear localization of HER3 was also confirmed in fresh UM material and in UM cell lines. In conclusion, HER3 is frequently localized solely in the cell nuclei in UM and as such it predicts a more favorable overall survival.

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