Abstract
Introduction
Neoadjuvant radiochemotherapy (RT/CTx) regimens were primarily designed for treatment of squamous cell carcinoma of the esophagus. Own preliminary results demonstrate that also patients with locally advanced adenocarcinoma of the esophagus may achieve a major response in 30% with a 3-year survival rate of 80%. To identify these patients, ERCC1 (rs11615) gene polymorphisms were analyzed. ERCC1 is a key enzyme of the nucleotide excision and repair (NER) complex to prevent DNA inter- and intra-strand crosslinks.
Patients and Methods
Genomic DNA from 217 patients with cT3/4 adenocarcinoma of the esophagus was extracted from paraffin-embedded tissues. Of these patients, 153 underwent neoadjuvant RT/CTx (CDDP, 5-FU, 36 Gy). For analysis of ERCC1 single nucleotide polymorphisms (SNPs), allelic discrimination was performed by quantitative real-time PCR. Two allele-specific TaqMan probes in competition were used for amplification of ERCC1 (rs11615). Allelic genotyping was correlated with histomorphologic tumor regression after neoadjuvant RT/CTx and survival. Major response (MaHR) was defined as <10% vital residual tumor cells (VRTC).
Results
Analysis of tumor regression revealed a MaHR in 56/153 (36.6%) patients with a 5-year survival rate (5-YSR) of 74% (p < 0.001). ERCC1 gene polymorphisms for all patients showed the following expression pattern: ERCC1 polymorphism (rs11615) CC: n = 27 (12.4%), TT: n = 98 (45.2%), C/T: n = 92 (42.4%). ERCC1 polymorphism CT was identified as a predictor for response to the neoadjuvant RT/CTx (p < 0.001). The 5-YSR for patients with C/T genotype was 51%. Contrary to this, the 5-YSR for the group of patients with a CC/TT polymorphism decreased to 34%.
Conclusion
Analysis of ERCC1 (rs11615) gene polymorphisms reveals a significant correlation with response and survival in patients with adenocarcinoma of the esophagus treated with a neoadjuvant radiochemotherapy. Single nucleotide polymorphisms of ERCC1 (rs11615) could therefore be applied to further individualize therapy in esophageal cancer.
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Discussion
Dr. Jeffrey H. Peters (Rochester, NY): Response prediction is a necessary and evolving advance in the adjuvant treatment of solid tumors including esophageal adenocarcinoma. While on average, adjuvant therapy may provide a 10–15% survival advantage it is widely recognized that a substantial subset of patients fail to respond and thus do not benefit and may even be harmed by neoadjuvant treatment.
Somatic genetic polymorphisms, that is the underlying genetic variability from patient to patient in one or more gene loci are among the possible predictive biomarkers.
The authors study ERCC polymorphism in a large cohort of patients with esophageal adenocarcinoma treated with neoadjuvant chemoradiotherapy.
I have 3 questions:
1. The patients received neoadjuvant chemoradiotherapy although the locus selected may be most sensitive to chemotherapy response. Would you extrapolate this data to patients receiving chemotherapy alone?
Closing Discussant
Dr. Ralf Metzger: Based on the data known, it is right that the locus selected in the study—ERCC1 SNP C118T—is most sensitive to chemotherapy response. Although there is evidence that ERCC1 is involved in repair of radiation-induced DNA damage, the most important function is the repair of DNA inter- and intra-strand crosslinks caused by platinum agents. Therefore, we also would extrapolate the data to patients receiving platinum-based chemotherapy alone.
2. If I recall correctly, ERCC mRNA levels have also been associated with response to platinum-based chemotherapy regimens. This raises the question of the mechanism of difference among the polymorphic groups. Are expression levels different for the three genetic phenotypes?
Closing Discussant
Dr. Ralf Metzger: This question raised by the primary discussant addresses the next step of research regarding ERCC1 and response prediction: There is evidence that ERCC1 mRNA levels might be a predictor of response to platinum-based chemotherapy regimens in upper GI cancer. With the detection of different single nucleotide polymorphisms of ERCC1, the question arises whether the different genotypes might also result in varying gene expressions. Given that the different genotypes code for the same (silent mutations) or different (missense mutations) amino acids, it is possible that the three genetic phenotypes have varying effects on health depending on whether they alter the function of essential proteins. To address this issue, ERCC1 SNPs and mRNA expressions should be analyzed within the same patient.
Recognizing that the data will require prospective validation, and that for the study to be meaningful it must facilitate clinical management, are the findings compelling enough for you to alter neoadjuvant treatment in patients without the CT genotype.
Closing Discussant
Dr. Ralf Metzger: The data presented are preliminary to make treatment decisions based on the ERCC1 genotype. However, a prospective randomized study should be initiated to validate the potential of ERCC1 SNP for prediction of response in multimodality treatment of esophageal cancer.
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Metzger, R., Warnecke-Eberz, U., Alakus, H. et al. Neoadjuvant Radiochemotherapy in Adenocarcinoma of the Esophagus: ERCC1 Gene Polymorphisms for Prediction of Response and Prognosis. J Gastrointest Surg 16, 26–34 (2012). https://doi.org/10.1007/s11605-011-1700-x
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DOI: https://doi.org/10.1007/s11605-011-1700-x