The objective of this study is to compare the short-term and 1-yr follow-up functional outcomes of retzius-repairing robot-assisted radical prostatectomy (RR-RARP) with retzius-sparing (RS) RARP.

This study is a single-centre, single-surgeon and a prospective randomized study.

Radical prostatectomy (RP) is the standard treatment method widely used in clinically localized and locally advanced prostate cancer (PCa). The main purpose of RP is to completely remove the tumor tissue and to provide the best oncological result and as well as recovery postoperative urinary continence and erectile functions. Depending on the severity of urinary leakage, incontinence is one of the important complications that seriously affect the quality of life after RP. Robot-assisted radical prostatectomy (RARP) has become a frequently preferred surgical treatment in PCa since the early 2000s. The effort to improve functional results has led to the continuous development and evolution of the robotic technique and different approaches have been tried to achieve the best. However, no sufficient evidence was found to show the superiority of any approach. In standard RARP, there may be a risk of deterioration of anatomical structures that contribute to the urinary continence (UC) mechanism due to the need for access to the retzius space. For this purpose, in 2010, Galfano et al. described a surgical technique performed through the douglas space in RP that preserves the retzius and the structures involved in the continence mechanism. With this technique, it is aimed to provide early recovery in UC and erectile functions after surgery by protecting the retzius. In the first case series of 200 patients, it was reported that an early UC was achieved in more than 90% of the patients. In addition, it was supported by other studies that early UC recovery rates are higher with the retzius-sparing (RS) technique, and in some series, immediate UC rates at the catheter removal were reported to be higher in the RS technique. However, it was stated that there was no significant difference in 1-year results between the standard technique and the RS technique. When the current literature is reviewed, the early continence advantages of the RS technique compared to the standard technique are emphasized. On the other hand, most surgeons still have not abandoned the standard technique, and a recent questionnaire of 250 participants showed that only 11% of RARP was performed using the RS-RALP approach. Although various continence preserving techniques have been tried in the standard RARP procedure, the high quality evidence for these techniques in the literature is limited.

The focus of our study is lack of a randomized prospective study comparing the modified reconstructive anterior approach, which we define as retzius-repairing (RR), and the RS technique in the evaluation of postoperative functional outcomes. Differ from the current literature, we aim of this study is to evaluate the results of a single surgeon prospective randomized comparative study on functional outcomes at 1-year follow-up between RR-RALP and RS-RALP for clinically localized PCa treatment.

This prospective randomized study has planned to carried out between June 2021 and December 2021, after achieving the ethics committee approval. Eligible patients were randomized in a 1:1 allocation ratio and 80 consecutive patients with clinically localized PCa underwent RALP by retzius-repairing (40 patients ) and retzius-sparing (40 patients) approach by a single surgeon (KT) and surgical team at a tertiary care institution (Ankara University School of Medicine), according to a parallel design. The assignment of each patient to the first or second treatment group was randomized with a computer-based randomization table. The UC recovery rates will be evaluated at the catheter removal, and subsequently at 1, 6 and 12 months after surgery. Postoperative potency will be eveluated at 3 and 12 months after surgeries. Other outcomes are the comparisons of postoperative complication rates, positive surgical margin and 1 year oncological outcomes.

Inclusion Criteria:

• Prostate cancer patients,
• Life expectancy > 10 years,
• Clinically organ confined disease (cT1-cT2),
• Biopsy Gleason score ≤ 7,
• Total serum PSA ≤ 10 ng/ml,
• Normal preoperative continence and potency.

Exclusion Criteria:

• Pre-existing urinary incontinence,
• Any previous prostatic, urethral, bladder neck surgery,
• Neoadjuvant therapy.