Aberrantly glycosylated PSMA in urine as a potential marker for prostate cancer

Abstract

<p>Early detection of prostate cancer (PCa) requires the development of reliable non-invasive biomarkers. In this study, we describe a simple, non-invasive assay to detect a prostate-specific membrane antigen (PSMA) glycoisoform directly from unprocessed urine. PSMA was analyzed in urine samples from PCa patients (<em>n</em> = 40) and benign controls (<em>n</em> = 37) using lectin MGL-coated europium-doped nanoparticles. MGL showed enhanced binding to PCa-derived PSMA, indicating aberrant glycosylation. Evaluation of individual samples demonstrated that the PSMA-MGL glycovariant assay significantly discriminated PCa from benign conditions (<em>p</em> = 0.01 pilot, <em>p</em> = 0.02 validation). Moreover, this assay exhibited a three-fold improvement in sensitivity over conventional antibody-based PSMA detection. ROC analysis showed an AUC of 0.648 for PSMA-MGL, which increased to 0.734 when combined with free-PSA and urinary creatinine, highlighting the enhanced diagnostic potential of this multimarker, non-invasive approach.<br></p>