Neoadjuvant treatment before radical prostatectomy has been proven to provide benefits on peri-operation results, especially on reduction of tumor volume and minimization of biochemical recurrence. This study will evaluate the efficacy and safety of abiraterone acetate Plus androgen deprivation therapy（ADT）in high-risk localized prostate cancer with intraductal carcinoma of the prostate（IDC-P）.

IDC-P is an adverse pathological entity of prostate cancer, characterized by the growth of malignant cells in pre-existing prostatic ducts and acini, and is present in high-grade disease and associated with poor prognosis. Previous studies have shown that IDC-P was significantly associated with an adverse clinical course in patients who received radical prostatectomy or radiotherapy, and the presence of IDC-P on the biopsy specimen was associated with a poor prognosis in terms of overall survival (OS) and a poor docetaxel response in patients with distant metastasis at the initial diagnosis. Our previous researches as well as other published data indicated that abiraterone had a better therapeutic efficacy than docetaxel as the first-line therapy in metastatic castration resistance prostate cancer（mCRPC）with IDC-P. Therefore we intended to perform this single-arm phase II clinical trial to evaluate the initial efficacy and safety of abiraterone acetate Plus ADT as neoadjuvant therapy for high-risk localized prostate cancer with IDC-P. The primary endpoint is the pathologic complete response (pCR).

Inclusion Criteria:

• Age ≥ 18 years

• Histologically or cytologically diagnosis of prostate cancer with positive IDC-P status

• High-risk localized prostate cancer, defined by either: Tumor stage ≥T3a by digital rectal examination, or Primary tumor Gleason score ≥ 8, or PSA > 20 ng/mL

• No evidence of metastases

• The ECOG score of the patient is ≤2

• Expected survival over 5 years

• Patients must participate voluntarily and sign an informed consent form (ICF), indicating that they understand the purpose and required procedures of the study, and are willing to participate in. Patients must be willing to obey the prohibitions and restrictions specified in the research protocol

• Agree to collect the tumor tissue and blood samples needed for the research and apply them to related study

• Adequate hematologic, renal and hepatic function:

  • Absolute neutrophil count [ANC] ≥1.5 x 10^9/L
  • Platelet count [PLT] ≥100 x 10^9/L
  • Hemoglobin [HGB] ≥9 g/dL
  • Serum Total bilirubin [TBIL] ≤1.5 x upper limit of normal (ULN)
  • Aspartate aminotransferase (AST), alanine aminotransferase (ALT) < 2.5 x ULN
  • Serum albumin [ALB] ≥2.8 g/dL
  • Serum Creatinine ≤ 1.5 x ULN
  • Creatinine Clearance ≥ 40 mL/min

Exclusion Criteria:

• Prior androgen deprivation therapy (medical or surgical), radiation therapy or chemotherapy for prostate cancer

• Evidence of metastatic disease (M1) on imaging studies

• Pathological finding consistent with small cell, ductal or neuroendocrine carcinoma of the prostate

• Major surgery or severe trauma within 30 days before enrollment

• Patients with severe or uncontrolled concurrent，including but not limited to：

  • Severe or uncontrolled concurrent infections
  • Human immunodeficiency virus [HIV] infection positive
  • Suffer from acute or chronic active hepatitis B (HBsAg positive and HBV DNA>1x10^3/mL) Or acute or chronic active hepatitis C (HCV antibody positive and HCV RNA>15 IU/mL)
  • Active tuberculosis, etc

• Abnormal cardiac function as manifested by NYHA (New York Heart Association) class III or IV heart failure，or clinically significant ventricular arrhythmias

• Uncontrolled hypertension（Systolic blood pressure≥160mmHg or Diastolic blood pressure≥100mmHg）

• Severe or unstable angina, myocardial infarction，arterial or venous thromboembolic events (eg, pulmonary embolism, cerebrovascular accident including transient ischemic attacks) Occurred within 6 months before enrollment

• Evidence of serious and/or unstable pre-existing medical, psychiatric or other condition (including laboratory abnormalities) that could interfere with patient safety or provision of informed consent to participate in this study

• Any condition that in the opinion of the investigator, would preclude participation in this study

Only male patient can enter this study