Abstract
The Gynecologic Oncology Group (GOG) examined the association between
ERBB2 amplification and clinical covariates, tumor response, disease status post-chemotherapy, progression-free survival (PFS), and overall survival (OS) in epithelial ovarian cancer (EOC).
Women with suboptimally-resected, advanced stage EOC who participated in GOG-111, a multi-center randomized phase III trial of cyclophosphamide
+
cisplatin versus paclitaxel
+
cisplatin, and provided a tumor block through the companion protocol GOG-9404 were eligible.
ERBB2 amplification was examined using fluorescence
in situ hybridization (FISH) with probes for
ERBB2 and the centromere of chromosome 17 (CEP17).
ERBB2 amplification, defined as >
2 copies of
ERBB2/CEP17, was a rare event in EOC with 7% (9/133) of women exhibiting between 2.2 and 33.7 copies of
ERBB2/CEP17, and was not associated with patient age, race, GOG performance status, stage, cell type, grade, measurable disease status, volume of ascites, tumor response or disease status post-chemotherapy. Women with >
2 verses ≤
2 copies of
ERBB2/CEP17 did not have a reduced risk of disease progression (hazard ratio [HR]
=
0.56; 95% confidence interval [CI]
=
0.27–1.16;
p
=
0.120) or death (HR
=
0.57; 95% CI
=
0.26–1.23;
p
=
0.152), and
ERBB2 amplification was not an independent prognostic factor for PFS or OS.
ERBB2 amplification, defined as >
4 copies of
ERBB2/nuclei, was observed in 9% (12/133) of women with levels ranging from 4.2 to 49.2 copies of
ERBB2/nuclei, and was associated with older age and volume of ascites, but not with the other clinical covariates or outcome.
ERBB2 amplification is a rare event and has no predictive or prognostic value in suboptimally-resected, advanced stage EOC treated with platinum-based combination chemotherapy.