Impact of Pattern Recognition Receptors on the Prognosis of Chemotherapy-treated Rectal Cancer Patients.

Background/aim: Chemotherapeutic drugs or radiation can cause immunogenic cell death (ICD) and damage-associated molecular pattern (DAMP) release to activate pattern recognition receptor (PRR) in immune cells. Several PRRs bridge innate immunity and adaptive immunity and are implicated in the anticancer immune response. However, single nucleotide polymorphisms (SNPs) in PRRs are associated with chemotherapeutic drugs or radiation response in cancer treatment.

Patients And Methods: We enrolled 117 patients with rectal cancer who received surgery with or without postoperative chemotherapy and examined the SNPs in PRRs from formalin-fixed, paraffin embedded tissues. The genotypes of RAGE (G82S/rs2070600), P2RX7 (E496A/rs3751143), and FPR1 (E346A/rs867228) were determined and analyzed using the MassARRAY platform.

Results: We integrated the status of PRR polymorphism into the PRR score and found that the PRR score was significantly associated with 10-year disease-free survival (DFS) (p=0.025) in patients with rectal cancer. Moreover, the PRR score was an independent risk factor for 10-year DFS (HR=4.400, 95%CI=1.607-12.212, p=0.004) and 10-year overall survival (OS) (HR=4.674, 95%CI=1.423-16.038, p=0.011) in patients with rectal cancer treated postoperatively with adjuvant chemotherapy.

Conclusion: The PRR score is an independent prognostic factor for the survival outcome of patients with rectal cancer, especially those treated postoperatively with adjuvant chemotherapy. PRR score evaluation may be used as a biomarker in the clinic.