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01.10.2011 | Original Article

Analysis of KRAS, BRAF, PTEN, IGF1R, EGFR intron 1 CA status in both primary tumors and paired metastases in determining benefit from cetuximab therapy in colon cancer

verfasst von: Jin Hyun Park, Sae-Won Han, Do-Youn Oh, Seock-Ah Im, Seung-Yong Jeong, Kyu Joo Park, Tae-You Kim, Yung-Jue Bang, Jae-Gahb Park

Erschienen in: Cancer Chemotherapy and Pharmacology | Ausgabe 4/2011

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Abstract

Purpose

The aim of this study was to determine the expression of molecular markers in metastatic colorectal cancer (mCRC) and the concordance between primary tumor and metastasis. We also aimed to determine the relationship between molecular markers and clinical outcomes of cetuximab-containing chemotherapy.

Methods

Seventy-five mCRC patients who received cetuximab-containing chemotherapy between 2000 and 2008 were consecutively enrolled. EGFR, p-EGFR, PTEN, and IGF-1R expression by immunohistochemistry, DNA sequencing for EGFR, KRAS, BRAF, and PI3 KCA, and EGFR amplification by FISH were done.

Results

The positive expression of EGFR, p-EGFR, PTEN, and IGF-1R was determined in 45 (64.3%), 9 (14.8%), 35 (50.7%), and 10 patients (16.1%), respectively. EGFR gene amplification or high polysomy was detected in 10 patients (17.6%). KRAS mutation and BRAF mutation were detected in 19 patients (27.5%) and five patients (7.0%), respectively. Among tested biomarkers, only the EGFR intron 1 CA repeat polymorphism and BRAF mutation showed concordance (kappa = 0.600, P = 0.003; and kappa = 0.692, P = 0.001, respectively) between primary tumor and paired metastasis. Skin rash was a strong predictive marker for response rate, PFS, and OS. In KRAS mutant tumors, PTEN expression was associated with a longer PFS. BRAF mutation was related to poor outcome in KRAS wild-type tumors.

Conclusions

BRAF mutations and EGFR intron 1 CA repeat polymorphisms were concordant between primary tumors and paired metastases. In KRAS mutant tumors, PTEN expression was a predictive marker for favorable outcomes. In KRAS wild type, BRAF mutation was strong predictive markers for poor outcomes.

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Titel: Analysis of KRAS, BRAF, PTEN, IGF1R, EGFR intron 1 CA status in both primary tumors and paired metastases in determining benefit from cetuximab therapy in colon cancer
verfasst von: Jin Hyun Park
Sae-Won Han
Do-Youn Oh
Seock-Ah Im
Seung-Yong Jeong
Kyu Joo Park
Tae-You Kim
Yung-Jue Bang
Jae-Gahb Park
Publikationsdatum: 01.10.2011
Verlag: Springer-Verlag
Erschienen in: Cancer Chemotherapy and Pharmacology / Ausgabe 4/2011
Print ISSN: 0344-5704
Elektronische ISSN: 1432-0843
DOI: https://doi.org/10.1007/s00280-011-1586-z

Springer Medizin

Analysis of KRAS, BRAF, PTEN, IGF1R, EGFR intron 1 CA status in both primary tumors and paired metastases in determining benefit from cetuximab therapy in colon cancer