MPS2 and Competitors
Existing biomarkers have reduced selectivity in detecting high-grade prostate tumors. This lower performance has led to the development of a new urine test including, for the first time, markers specifically overexpressed in high-grade prostate cancer. This new MPS2 test has a sensitivity of 95% for high-grade prostate cancer and a specificity ranging from 35% to 51%, depending on the subgroups. For clinicians, widespread use of MPS2 could greatly reduce the number of unnecessary biopsies while maintaining a high detection rate of grade 2 or higher prostate cancer.
Among patients who have had a negative first biopsy, MPS2 would have a sensitivity of 94.4% and a specificity of 51%, which is much higher than other tests like prostate cancer antigen 3 gene, three-gene model, and MPS. In addition, in patients with grade 1 prostate cancer, urinary markers for high-grade cancer could indicate the existence of a more aggressive tumor requiring increased monitoring.
This study has limitations, however. The ethnic diversity of its population was limited. A few Black men were included, for example. Second, a systematic biopsy was used as the reference, which can increase negative predictive value and decrease positive predictive value. Classification errors may have occurred. Therefore, further studies are needed to confirm these initial results and the long-term positive impact of using MPS2.
In conclusion, an 18-gene urine test seems to be more relevant for diagnosing high-grade prostate cancer than existing tests. It could prevent additional imaging or biopsy examinations in 35%-41% of patients. Therefore, the use of such tests in patients with high PSA levels could reduce the potential risks associated with prostate cancer screening while preserving its long-term benefits.
This story was translated from JIM, which is part of the Medscape professional network, using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.