This retrospective study aims to identify predictive factors for biochemical recurrence (BCR) in patients with localized prostate cancer who underwent robot-assisted radical prostatectomy (RARP). BCR is defined as a rise in prostate-specific antigen (PSA) levels after surgery, which may indicate residual or recurrent disease.

We will analyze clinical, imaging, and pathological data from patients treated at Fujian Medical University Affiliated First Hospital between January 2024 and May 2026. Key variables include preoperative PSA, Gleason score, pathological T stage, surgical margin status, perineural invasion, prostate volume, MRI-based parameters (e.g., Pi-RADS score, SUVmax on PSMA PET/CT), and inflammatory markers.

Using logistic regression and machine learning approaches (random forest, XGBoost, SVM), we will develop and internally validate a predictive model to estimate individual BCR risk. The goal is to improve post-surgical risk stratification, guide personalized monitoring, and support clinical decision-making regarding adjuvant therapy.

This research has received ethical approval. Data will be anonymized and handled confidentially. Findings will be disseminated to inform clinical practice and future research.

Inclusion Criteria:

• Pathologically confirmed prostate adenocarcinoma

Clinical stage localized prostate cancer (T1-T2, N0M0)

Underwent robot-assisted radical prostatectomy (RARP)

Age ≥ 18 years

Complete clinical data including preoperative PSA, Gleason score, pathological T stage, and surgical margin status

At least one postoperative PSA measurement available to determine biochemical recurrence status

Signed informed consent for surgery and data use (or ethics committee waiver of consent for retrospective analysis)

Exclusion Criteria:

• Received neoadjuvant endocrine therapy, radiotherapy, or chemotherapy prior to surgery

Concurrent active malignancy other than non-melanoma skin cancer

Preoperative evidence of lymph node metastasis (N+), distant metastasis (M1), or clinical stage T3-T4

Missing core predictors (e.g., preoperative PSA, Gleason score, pathological T stage) or insufficient postoperative PSA data to determine BCR status

Received adjuvant radiotherapy or adjuvant endocrine therapy before biochemical recurrence was determined

Severe cardiac, hepatic, or renal dysfunction, or life expectancy < 1 year

All patients with localized prostate adenocarcinoma (clinical stage T1-T2, N0M0) who underwent robot-assisted radical prostatectomy (RARP) at Fujian Medical University Affiliated First Hospital between January 2020 and May 2026. Consecutive patients meeting eligibility criteria are included. No specific sampling frame or probability sampling method is applied.

This is a single-center retrospective study, and patient data confidentiality agreements restrict sharing of individual participant data.