Expression of C4.4A in precursor lesions of pulmonary adenocarcinoma and squamous cell carcinoma.

Abstract:

:The protein C4.4A, a structural homologue of the urokinase-type plasminogen activator receptor, is a potential new biomarker in non-small cell lung cancer, with high levels of expression recently shown to correlate to poor survival of adenocarcinoma patients. In this study, C4.4A immunoreactivity in precursor lesions of lung squamous cell carcinoma and adenocarcinoma was investigated by stainings with a specific anti-C4.4A antibody. In the transformation from normal bronchial epithelium to squamous cell carcinoma, C4.4A was weakly expressed in basal cell hyperplasia but dramatically increased in squamous metaplasia. This was confined to the cell membrane and sustained in dysplasia, carcinoma in situ, and the invasive carcinoma. The induction of C4.4A already at the stage of hyperplasia could indicate that it is a marker of very early squamous differentiation, which aligns well with our earlier finding that C4.4A expression levels do not provide prognostic information on the survival of squamous cell carcinoma patients. In the progression from normal alveolar epithelium to peripheral adenocarcinoma, we observed an unexpected, distinct cytoplasmic staining for C4.4A in a fraction of atypical adenomatous hyperplasias, while most bronchioloalveolar carcinomas were negative. Likewise, only a fraction of the invasive adenocarcinomas was positive for C4.4A. With a view to the prognostic impact of C4.4A in adenocarcinoma patients, this finding might suggest that C4.4A could be an early biomarker for a possibly more malignant subtype of this disease.

journal_name

Int J Cancer

authors

Jacobsen B,Santoni-Rugiu E,Illemann M,Kriegbaum MC,Laerum OD,Ploug M

doi

10.1002/ijc.26305

subject

Has Abstract

pub_date

2012-06-01 00:00:00

pages

2734-9

issue

11

eissn

0020-7136

issn

1097-0215

journal_volume

130

pub_type

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