Minimal Residual Disease Used in Predicting Therapeutic Efficacy in Metastatic Hormone-sensitive Prostate Cancer

Inclusion Criteria: 1. Aged 18 years and younger than 85 years; 2. Patients diagnosed with prostate acinar adenocarcinoma, ductal adenocarcinoma, or intraductal carcinoma by pathological histology; 3. Patients with clear distant metastases found by imaging (in accordance with RECIST criteria); 4. Patients with locally advanced (N1) and metastatic (M1) prostate cancer at diagnosis. 5. Patients who have not received endocrine therapy or other systemic anti-tumor treatments in the past; 6. ECOG score of 0-2 points, with an expected survival period of more than 6 months; 7. Patients with normal organ function; 8. Routine blood test (no blood transfusion or blood products within 14 days): Hemoglobin (HGB) ≥ 90g/L; Absolute neutrophil count (ANC) ≥ 1.5×109/L (1500 /mm3); Platelet count (PLT) ≥ 75×109/L; White blood cell count (WBC) ≥ 3×109/L; 9. Biochemical examination: Total bilirubin (TBIL) ≤ upper limit of normal (ULN); Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5 ULN; Creatinine clearance (CCr) ≥ 30ml/min; (Cockcroft-Gault formula); 10. Coagulation function: prothrombin international normalized ratio (INR) ≤ 1.5 or prothrombin time (PT) \< 4 seconds; 11. Patients agree to sign informed consent and are able to attend scheduled study visits, provide clinical information, and cooperate with other study procedures. Exclusion Criteria: * (1) Patients diagnosed with neuroendocrine/small cell prostate cancer by pathological histology; (2) No clear distant metastasis was found by imaging (in accordance with RECIST criteria); (3) Patients with a history of previous treatment: including neoadjuvant and adjuvant therapy; (4) The samples submitted for examination failed to meet the quality control requirements. (5) Patients with combined endocrine, metabolic system diseases or other serious digestive system diseases; (6) Patients with combined chronic hepatitis, cirrhosis, chronic nephritis, renal insufficiency and other diseases; (7) Patients with a history of immunodeficiency, including HIV positive or other acquired or congenital immunodeficiency diseases, or a history of organ transplantation; (8) Patients with a history of other malignant tumors; (9) Patients enrolled in other clinical trials; (10) Patients unable to obtain the clinical information required for the study (e.g., patients lost to follow-up); (11) Other situations that the researchers consider unsuitable for enrollment.