Tibia metastasis without prostate specific antigen (PSA) increase following radical vesiculo-prostatectomy.

Area of Science:

• Oncology
• Urology

Background:

• Prostate-specific antigen (PSA) is the standard biomarker for monitoring prostate cancer recurrence after treatment.
• Radical prostatectomy is a common treatment, with recurrence typically indicated by rising PSA levels.

Observation:

• A single case of tibial metastasis from prostate cancer was observed in a patient with persistently undetectable PSA levels post-surgery.
• This contrasts with the usual pattern where rising PSA precedes or accompanies metastatic disease.

Findings:

• Tissue analysis revealed significantly lower PSA expression in the tibial metastasis compared to the primary prostate tumor.
• This reduced PSA production in metastatic tissue is hypothesized to explain the absence of a PSA surge.

Implications:

• This case highlights that prostate cancer progression, including metastasis, can occur asymptomatically with non-detectable PSA.
• It suggests the need for vigilance and potentially imaging surveillance even in the absence of PSA elevation in select high-risk patients.
• Further research is warranted to understand the mechanisms of PSA-negative metastasis in prostate cancer.