SIK2 and neoplasm: The remaining 19 biomarkers did show significantly different expression at the protein level between tumour and benign tissue; AGR2, AMACR, ANPEP, CD10, ERG, GDF15, MSMB, TP63, PSMA, VPS13A and VPS28 highly significantly (p < 0.001) and AR, KDHRBS3, NAALADL2, PSA, PTEN and SIK2 having a significance of p < 0.01.