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Expression of EGFR, HER-2/neu and KIT in germ cell tumours
Ignacio Durán1, Adelaida García-Velasco, Claudio Ballestín
1Medical Oncology Department, Hospital Universitario Doce de Octubre, Madrid, Spain. duranign@gmail.com
Background:
Germ cell tumours (GCTs) represent an extraordinarily chemosensitive malignancy. However, 20-30% of patients with advanced disease cannot be cured by currently available treatments. The role of tyrosine kinase receptors has been widely studied in other malignancies. Yet, limited information is available on GCTs.
Methods:
One hundred and nine paraffin-embedded GCTs in 84 patients were assessed by immunohistochemistry for epidermal growth factor receptor (EGFR), human epidermal growth factor receptor 2 (HER-2)/neu and KIT (CD117) expression. Univariate and multivariate analyses were performed to evaluate their role as predictive and/or prognostic factors.
Results:
EGFR and HER-2/neu staining was detected in 28% and 13% of tumours, respectively, predominantly in nonseminomatous GCTs. KIT protein was almost universally expressed in seminomas (97%), being virtually absent in choriocarcinoma and teratocarcinoma subtypes. EGFR expression showed inverse association with tumour response of borderline significance. With a median follow-up of 10.6 years, no significant association was observed between the expression of any of these markers and relapse-free or overall survival.
Conclusions:
EGFR, HER-2/neu and KIT have differential patterns of expression in GCTs according to histological subtypes. The expression of these markers in our series had no prognostic or predictive significance.
Insights
This study investigated tyrosine kinase receptor expression in germ cell tumors (GCTs). While EGFR, HER-2/neu, and KIT show varied expression by GCT subtype, they did not prove to be significant prognostic or predictive factors.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Germ cell tumors (GCTs) are highly chemosensitive, yet 20-30% of advanced cases remain incurable.
- Tyrosine kinase receptors are implicated in other cancers, but their role in GCTs is under-researched.
Purpose of the Study:
- To investigate the expression patterns of epidermal growth factor receptor (EGFR), human epidermal growth factor receptor 2 (HER-2)/neu, and KIT (CD117) in GCTs.
- To evaluate these markers as potential predictive or prognostic factors in GCT patients.
Main Methods:
- Immunohistochemistry was used to assess EGFR, HER-2/neu, and KIT expression in 109 GCT samples from 84 patients.
- Univariate and multivariate analyses were conducted to determine the significance of marker expression.
Main Results:
- EGFR and HER-2/neu were found in 28% and 13% of tumors, respectively, mainly in nonseminomatous GCTs.
- KIT was highly expressed in seminomas (97%) but rare in choriocarcinoma and teratocarcinoma.
- No significant association was found between marker expression and relapse-free or overall survival, though EGFR showed borderline inverse association with tumor response.
Conclusions:
- EGFR, HER-2/neu, and KIT exhibit distinct expression profiles across GCT histological subtypes.
- The studied tyrosine kinase receptors lack prognostic or predictive value in this patient cohort.
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