ONCOmmunity

Amphiregulin/epiregulin mRNA Expression and Primary Tumor Location in Colorectal Cancer.

By: Hidekazu Kuramochi, G O Nakajima, Kazuhiko Hayashi, Tatsuo Araida, Masakazu Yamamoto

Department of Chemotherapy, Yachiyo Medical Center, Tokyo Women's Medical University, Chiba, Japan kuramochi.hidekazu@twmu.ac.jp.
2019-07-31; doi: 10.21873/anticanres.13655

Abstract

Background/aim

Amphiregulin (AREG) and epiregulin (EREG) mRNA expression levels are predictors of response to anti-EGFR antibody therapy. Left-sided colon cancer is more sensitive to anti-EGFR antibodies than right-sided, although the mechanism is unclear. The aim of this study was to determine the relationship between AREG, EREG mRNA expression levels and tumor location as well as the efficacy of anti-EGFR antibody agents.

Materials

Real-time PCR was used to assess AREG and EREG mRNA expression in metastatic colorectal cancer (CRC) samples from 153 patients.

Results

Among KRAS^wt samples, high AREG expression (AREG^High) was significantly more common in left-sided tumors than in right-sided. Among patients who received anti-EGFR antibody, response rates were significantly higher in AREG^High than in AREG^Low In the left-sided tumor group, overall survival was significantly longer in patients with high EREG levels than with low levels, whereas the right-sided tumor group showed no survival difference between them.

Conclusion

AREG and EREG mRNA expression levels in left-sided CRC were higher than in right-sided tumors. This may help explain why left-sided CRC is more responsive to anti-EGFR antibodies.