Expression of Serpin B9 as a Prognostic Factor of Colorectal Cancer.

BACKGROUND/AIM: Treatment of colorectal cancer (CRC) does not reflect immune interactions between tumours and macro-organisms. Serpin B9 is known as an inhibitor of Granzyme B. The aim of this study was to evaluate the impact of the expression of Serpin B9 in CRC and healthy colon tissue on prognosis. PATIENTS AND METHODS: This retrospective study included 74 CRC patients in all stages. Analysis of gene expression was performed with quantitative polymerase chain reaction with reverse transcription using specific primers and master mix Xceed qPCR SG. Expression was normalized to the reference genes GAPDH, ACTB, and PSMC. RESULTS: Increased expression of Serpin B9 in healthy tissue was significantly associated with longer overall survival (OS). This association was found both in all patients and in the group of patients with distant metastases. CONCLUSION: The presented results support previous evidence of positive influence of the interaction between immune system and tumour on the prognosis of CRC.