Prostate Cancer Metastasis: Patterns, Mechanisms, and Management
Metastatic prostate cancer (mPCa) denotes spread beyond the prostate capsule. It is incurable but treatable; median survival has improved significantly with novel agents.
Metastatic Patterns
| Site | Frequency | Clinical Features |
|---|
| Bone | 85–90% | Spine, pelvis, ribs, femurs; osteoblastic (sclerotic) lesions; pain, fracture risk, cord compression, hypercalcemia |
| Lymph Nodes | 40–50% | Pelvic, retroperitoneal, mediastinal; often asymptomatic |
| Liver | 20–25% | Hepatomegaly, LFT elevation, cachexia |
| Lung | 20–25% | Nodules, effusions, dyspnea |
| Visceral (Other) | <10% | Brain, adrenal, breast, skin — aggressive biology |
Mechanisms of Spread
- Hematogenous: Batson's plexus (valveless vertebral venous) → axial skeleton seeding.
- Lymphatic: Obturator, internal/external iliac, presacral nodes.
- Direct Extension: Bladder, rectum, seminal vesicles (local, not metastatic).
Diagnostic Workup
- PSA (serial), PSADT.
- Conventional: Bone scan (⁹⁹ᵐTc-MDP) + CT abdomen/pelvis.
- Advanced: PSMA-PET/CT (↑ sensitivity/specificity; NCCN preferred for staging/restaging).
- Biopsy: Confirm histology, AR status, genomic classifiers (Decipher, Oncotype).
Treatment Paradigm (mHSPC / mCRPC)
- mHSPC (Metastatic Hormone-Sensitive): ADT + androgen receptor pathway inhibitor (abiraterone, enzalutamide, apalutamide, darolutamide) ± docetaxel ± radiotherapy to primary (STAMPEDE). Standard of care.
- mCRPC (Metastatic Castration-Resistant): Sequential ARPI, taxanes, ¹⁷⁷Lu-PSMA-617 (PSMA+), PARP inhibitors (HRRm), immunotherapy (limited), radiopharmaceuticals (Radium-223 for bone-only).
- Bone Health: Denosumab/zoledronic acid for skeletal-related events.
Prognostic Factors
- Volume (CHAARTED: high-volume = visceral mets or ≥4 bone lesions with ≥1 beyond axial).
- Genomics (AR-V7, RB1/TP53 loss, HRR mutations).
- PSA kinetics, LDH, albumin, performance status.
Multidisciplinary tumor board coordination optimizes sequencing and trial access.
Prostate Cancer - Related Articles
