Radiation Oncology Journal

The Korean Society for Radiation Oncology (대한방사선종양학회)
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Single nucleotide polymorphism of GSTP1 and pathological complete response in locally advanced rectal cancer patients treated with neoadjuvant concomitant radiochemotherapy

  • Nicosia, Luca (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • Gentile, Giovanna (Department of Neuroscience, Mental Health and Sense Organs, Sapienza University of Rome) ;
  • Reverberi, Chiara (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • Minniti, Giuseppe (Department of Neurological Sciences, IRCCS Neuromed) ;
  • Valeriani, Maurizio (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • de Sanctis, Vitaliana (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • Marinelli, Luca (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • Cipolla, Fabiola (Department of Neuroscience, Mental Health and Sense Organs, Sapienza University of Rome) ;
  • de Luca, Ottavia (Department of Advanced Molecular Diagnostic, Sant'Andrea Hospital, Sapienza University of Rome) ;
  • Simmaco, Maurizio (Department of Neuroscience, Mental Health and Sense Organs, Sapienza University of Rome) ;
  • Osti, Mattia F. (Department of Radiation Oncology, Sant'Andrea Hospital, Sapienza University of Rome)
  • Received : 2018.03.01
  • Accepted : 2018.06.14
  • Published : 2018.09.30
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Abstract

Purpose: Standard treatment for locally advanced rectal cancer consists of neoadjuvant radiochemotherapy with concomitant fluoropyrimidine or oxaliplatin and surgery with curative intent. Pathological complete response has shown to be predictive for better outcome and survival; nevertheless there are no biological or genetic factors predictive for response to treatment. We explored the correlation between the single nucleotide polymorphisms (SNPs) GSTP1 (A313G) and XRCC1 (G28152A), and the pathological complete response and survival after neoadjuvant radiochemotherapy in locally advanced rectal cancer patients. Materials and Methods: Genotypes GSTP1 (A313G) and XRCC1 (G28152A) were determined by pyrosequencing technology in 80 patients affected by locally advanced rectal cancer. Results: The overall rate of pathological complete response in our study population was 18.75%. Patients homozygous AA for GSTP1 (A313G) presented a rate of pathological complete response of 26.6% as compared to 8.5% of the AG+GG population (p = 0.04). The heterozygous comparison (AA vs. AG) showed a significant difference in the rate of pathological complete response (26.6% vs. 6.8%; p = 0.034). GSTP1 AA+AG patients presented a 5- and 8-year cancer-specific survival longer than GSTP1 GG patients (87.7% and 83.3% vs. 44.4% and 44.4%, respectively) (p = 0.014). Overall survival showed only a trend toward significance in favor of the haplotypes GSTP1 AA+AG. No significant correlations were found for XRCC1 (G28152A). Conclusion: Our results suggest that GSTP1 (A313G) may predict a higher rate of pathological complete response after neoadjuvant radiochemotherapy and a better outcome, and should be considered in a more extensive analysis with the aim of personalization of radiation treatment.

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References

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