Metastatic Prostate Cancer Diagnosis and Management

Diagnostic Criteria

A PSA level >10 ng/mL carries a >50% probability of prostate cancer, according to the European Association of Urology 1, 2
The markedly elevated alkaline phosphatase strongly suggests bone metastases, as recommended by the European Society for Medical Oncology 1, 2
Back pain in the context of prostate cancer typically indicates vertebral metastases, as stated by the American Urological Association 1
The combination of obstructive urinary symptoms, back pain, and laboratory findings creates a highly specific pattern for metastatic prostate cancer, according to the National Comprehensive Cancer Network 1, 2

Alkaline phosphatase would remain normal in prostatitis, as noted by the American Urological Association 5
BPH does not cause elevated alkaline phosphatase, as stated by the European Association of Urology 5
BPH does not typically cause back pain, according to the American Urological Association 5

Bone scintigraphy is mandatory given PSA >10 mg/L and clinical suspicion of bone metastases, as recommended by the European Society for Medical Oncology 1, 2, 3, 4
Tissue diagnosis via transrectal ultrasound-guided biopsy should be obtained, according to the National Comprehensive Cancer Network 1, 2, 3, 4

Do not delay imaging for potential spinal cord compression - back pain with neurologic symptoms requires urgent MRI to exclude epidural metastases requiring emergency intervention, as stated by the American College of Radiology 1