RGD Reference Report - Effect of Simvastatin on Cetuximab Resistance in Human Colorectal Cancer With KRAS Mutations. - Rat Genome Database

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Effect of Simvastatin on Cetuximab Resistance in Human Colorectal Cancer With KRAS Mutations.

Authors: Lee, J  Lee, I  Han, B  Park, JO  Jang, J  Park, C  Kang, WK 
Citation: Lee J, etal., J Natl Cancer Inst. 2011 Apr 20;103(8):674-88. Epub 2011 Mar 11.
RGD ID: 5131455
Pubmed: PMID:21398618   (View Abstract at PubMed)
DOI: DOI:10.1093/jnci/djr070   (Journal Full-text)

Background Metastatic colorectal cancer (CRC) patients with v-Ki-ras2 Kirsten rat sarcoma viral oncogene homolog (KRAS) mutations are resistant to treatment with cetuximab, a monoclonal antibody that targets the epidermal growth factor receptor. Statins have reported antitumor activity, but it is unknown whether simvastatin can reverse cetuximab resistance in KRAS mutant CRC. Methods Human CRC cell lines with KRAS mutations (LS153, LS174T, DLD1, LoVo, SW403, SW480, SNU175, and LS1034) or with v-raf murine sarcoma viral oncogene homolog B1 (BRAF) mutations (DiFi, SW48, HT29, and RKO) were used to test the effect of cetuximab, simvastatin, and cetuximab plus simvastatin on cell proliferation and apoptosis in vitro. Because BRAF(V600E) mutant may be responsible for cetuximab resistance in KRAS wild-type cells, we measured the growth of xenograft tumors originating from KRAS mutant and BRAF mutant cells in mice treated with cetuximab alone or plus simvastatin (n = 5 mice per treatment group). We used immunoblot assays to study RAS-regulated activation of BRAF protein after simvastatin treatment. All statistical tests were two-sided. Results Addition of simvastatin (0.2 muM) to cetuximab (0.03-1.0 muM) reduced cell proliferation of KRAS mutant (P < .001) but not of BRAF mutant CRC cells in vitro. Treatment of KRAS mutant cells with simvastatin reduced BRAF activity and induced apoptosis. Treatment with cetuximab and simvastatin reduced the growth of xenograft tumors originating from KRAS mutant cells compared with cetuximab alone (eg, for tumors originating from DLD1 cells, cetuximab vs cetuximab + simvastatin, mean tumor volume = 49.4 vs 20.2 cm(3), mean difference = 29.2 cm(3), 95% confidence interval = 19.7 to 38.5, P < .001); treatment with cetuximab alone or in combination with simvastatin had no effect on the growth of BRAF mutant tumors. Conclusion Simvastatin may overcome cetuximab resistance in colon cancer cells with KRAS mutations by modulating BRAF activity and inducing apoptosis.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
colorectal cancer  IMP 5131455human tumor in mouse modelRGD 
colorectal cancer  ISOEGFR (Homo sapiens)5131455; 5131455human tumor in mouse modelRGD 

Objects Annotated

Genes (Rattus norvegicus)
Egfr  (epidermal growth factor receptor)

Genes (Mus musculus)
Egfr  (epidermal growth factor receptor)

Genes (Homo sapiens)
EGFR  (epidermal growth factor receptor)


Additional Information