Abstract | PURPOSE: EXPERIMENTAL DESIGN: In available breast cancer tissue from EGF30001 ( paclitaxel +/- lapatinib in HER-2-negative/unknown metastatic breast cancer, n = 579) and EGF100151 ( capecitabine +/- lapatinib in HER-2-positive metastatic breast cancer, n = 399), HER-2 gene amplification by fluorescence in situ hybridization (FISH), HER-2 mRNA by reverse transcription-PCR (RT-PCR), HER-2 protein expression by HercepTest immunohistochemistry (IHC), epidermal growth factor receptor (EGFR) mRNA level by RT-PCR, and EGFR protein by IHC were analyzed and compared with clinical outcome. HER-2 was determined by FISH in an academic reference/research laboratory and in a large, high-volume commercial reference laboratory. RESULTS: The HER-2 gene was amplified in 47% (344 of 733) and IHC was 3+ in 35% (279 of 798), with significant correlation (P < 0.01) between FISH and IHC. Positive EGFR immunostaining (IHC 1+, 2+, or 3+) in 28% (213 of 761) correlated with EGFR mRNA levels by RT-PCR (r = 0.59; P < 0.01). HER-2 gene amplification/overexpression was associated with improved clinical outcomes (progression-free survival; P < 0.001) in both trials. A significant improvement in outcome was seen in FISH-positive and IHC 0, 1+, or 2+ patients. HER-2 mRNA expression correlated with HER-2 FISH (r = 0.83) and IHC status (r = 0.72; n = 138). No correlation was found between EGFR expression (IHC or mRNA) and responsiveness to lapatinib regardless of HER-2 status. Although a significant correlation with lapatinib responsiveness was observed among "HER-2-negative" breast cancer patients in the large, high-volume commercial reference laboratory, this was not confirmed in the academic reference/research laboratory. CONCLUSIONS:
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Authors | Michael F Press, Richard S Finn, David Cameron, Angelo Di Leo, Charles E Geyer, Ivonne E Villalobos, Angela Santiago, Roberta Guzman, Armen Gasparyan, Yanling Ma, Kathy Danenberg, Anne Marie Martin, Lisa Williams, Cristina Oliva, Steven Stein, Robert Gagnon, Michael Arbushites, Maria T Koehler |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 14
Issue 23
Pg. 7861-70
(Dec 01 2008)
ISSN: 1078-0432 [Print] United States |
PMID | 19047115
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antineoplastic Agents
- Biomarkers, Tumor
- Quinazolines
- RNA, Messenger
- Lapatinib
- ErbB Receptors
- Receptor, ErbB-2
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Topics |
- Antineoplastic Agents
(therapeutic use)
- Biomarkers, Tumor
(genetics)
- Breast Neoplasms
(drug therapy, genetics, mortality)
- Clinical Trials, Phase III as Topic
- Disease-Free Survival
- Drug Resistance, Neoplasm
(genetics)
- ErbB Receptors
(biosynthesis, genetics)
- Female
- Gene Amplification
- Genes, erbB-2
- Humans
- Immunohistochemistry
- In Situ Hybridization, Fluorescence
(standards)
- Kaplan-Meier Estimate
- Laboratories, Hospital
(standards)
- Lapatinib
- Medical Laboratory Personnel
- Pathology, Clinical
(standards)
- Physicians
- Quinazolines
(therapeutic use)
- RNA, Messenger
(analysis)
- Receptor, ErbB-2
(biosynthesis, genetics)
- Reproducibility of Results
- Reverse Transcriptase Polymerase Chain Reaction
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