Intraoperative Nerve Monitoring During Robot-assisted Laparoscopic Prostatectomy

Study Design:

This is a single surgeon, single institution prospective post-market study of patients
undergoing a robotic-assisted laparoscopic prostatectomy (RALP) with intraoperative nerve
monitoring of pelvic nerves using the ProPep Nerve Monitoring System. The treatment group
will consist of 80 subjects (with 69 anticipated to be evaluable) undergoing RALP with
intraoperative nerve monitoring (IONM). This will be compared to a consecutive group of
contemporary control cohort patients who have underwent RALP without nerve monitoring by the
same single surgeon.

Baseline Evaluations and Data Collection:

Pre-operative baseline evaluations and data collection will be used to determine eligibility
for enrollment and to document subject clinical status prior to surgical procedure. This
information is recorded on the Screening case report forms (CRF).

The following data will be collected at screening/baseline:

- Medical History including Gleason score at biopsy, and clinical stage (cT, TNM 2002);

- Physical examination;

- Demographic information;

- Current symptoms;

- Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) Questionnaire;

- SHIM Questionnaire;

- Use of any drugs for erectile dysfunction ;

- Confirmation of inclusion and exclusion criteria.

Surgical Procedure The surgical procedure should be completed according to site-specific
standards. The following is a general overview of the surgical procedure for this study. The
daVinci Surgical System must be used. Additional instrumentation necessary to perform the
procedure is determined by the surgeon.

The Pep Electrode Introducer facilitates the introduction of the needle electrodes into the
pelvis. The electrodes are initially placed in the levator muscle near the apex of the
prostate in the area of the nerve bundles prior to the pedicle dissection to identify the
perineal branches of the pudendal nerve. Prior to posterior dissection of the apex of the
prostate, the needle electrodes are removed from the levator muscle and moved to the external
urethral sphincter to identify the deep (muscular) branch of the perineal nerves. Action
potentials are measured by the Pep Monitor.

Signals are induced in the nerve(s) of interest by stimulating the tissue surrounding the
nerve(s) along the presumed nerve pathway with a low level electrical current. The low level
current is delivered through the conventional bipolar instrument used during robotic surgery
and when delivered close to a nerve it triggers and action potential in the nerve that is
displayed on the Pep Monitor. The Pep Control Switch is used to switch the bipolar instrument
between cautery mode and stimulation mode. The closer the bipolar instrument is to the nerve
being located, the larger the amplitude of the action potential displayed by the Pep Monitor.

Nerves will be identified with the device prior to pedicle and apical dissection to establish
nerve location. Nerve monitoring may be used through the course of dissections to confirm
nerve location. Post-dissection readings will be collected after specimen removal to confirm
the integrity of the preserved nerve tissue at the end of the case.

During the procedure and through hospital discharge the following data points will be
collected:

- Type of nerve sparing - none, partial, and bilateral;

- Prostate size;

- Estimated blood loss and transfusion(s);

- Method of dissection (transperitoneal anterior, posterior, extraperitoneal, or lymph
node dissection);

- Gleason score at radical prostatectomy;

- Pathological stage (nT);

- Positive surgical margin rate (PSM);

- Total robotic and surgical time;

- Total time for device deployment;

- Hospital admission / discharge dates; and

- Adverse events.

Postoperative care will be according to the site-specific standard of care.

Follow-up Evaluation and Data Collections:

Subjects will be followed post-operatively at catheter removal (typically 1 week), 1 month
(±2 weeks), 3 months (±3 weeks), 6 months (±1 month), and 12 months (±1 month) following the
procedure. Data will be collected on the appropriate follow-up Case Report Forms (CRFs). The
CRFs for each of the follow-up data collection points will be supplied to the subjects upon
their discharge from the hospital following their procedure. Research assistant will call
subjects the week prior to the due date to remind subjects to fill in and mail back (via
pre-addressed, stamped envelopes supplied with CRFs) appropriate CRF. Site specific standard
of care will be followed post-operatively.

The following data and testing will be completed at each follow-up visit:

- Current symptoms;

- Modified EPIC-CP Questionnaire (question 3 and 4);

- SHIM Questionnaire;

- Use of any drugs for erectile dysfunction; and

- Adverse events (AE).

Contemporary Control Cohort:

As the procedures for the prospective cohort are standard of care at the investigators
institution, the investigator will have all of the same measures for the contemporary control
cohort that he has for the for the prospective cohort. Each prospective subject will be
matched to two selected subjects in the contemporary control cohort by biopsy Gleason score
(6 vs. 7 vs. 8-10), nerve-sparing status (yes/no), type of nerve sparing (unilateral or
bilateral) and age (within 5 years). The contemporary control cohort will draw from
consecutive patients who have undergone RALP in the previous two years (2012-2014) that did
not have IONM. The investigator will not record AEs for this contemporary control cohort as
the investigator is only interested in collecting AEs data potentially related to the use of
the IONM.

Inclusion Criteria:

- Male subjects 40-70 years of age diagnosed with adenocarcinoma of the prostate;

- Subjects scheduled for robotic assisted radical prostatectomy for removal of localized
prostate cancer;

- Subjects, who, in the opinion of the clinical Investigator, are able to understand
this clinical investigation, cooperate with the investigational procedures and are
willing to return for all the required post-treatment follow-up visits

Exclusion Criteria:

- Subjects with pre-operative urinary incontinence defined as use of pads or adult
diapers;

- Subjects with previous pelvic or abdominal radiation therapy;

- Subjects with current or previous malignancy other than prostate or non-melanoma skin
cancer;

- Subjects who have previously had a transurethral resection of the prostate (TURP) or
holmium laser enucleation of the prostate (HoLEP), high intensity focused ultrasound
(HIFU) or cryotherapy;

- Subjects with a prostate volume of >80mL

- Subjects with a body mass index (BMI) of ≥ 34;

- Subjects with current or suspected urinary tract or bladder infection(s);

- Subjects with reported unstable cardiovascular disease (e.g., unstable angina,
myocardial infarction within past 6 months, cardiac failure or life-threatening
arrhythmia, congestive heart failure) or symptomatic postural hypotension within 6
months before screening;

- Subjects with a history of diabetes;

- Subjects with drug, alcohol, or substance abuse reported within the last three years
(subject reported);

- Subjects with a life expectancy less than study duration;

- Subjects with systemic autoimmune disorder;

- Subjects with any significant psychological disturbance that, in the opinion of the
Investigator, could impair the consent process or ability to complete self-assessment
questionnaires.

- Subjects with known sensitivity to any device or products required for the RALP
surgery; and

- Subjects with any other condition that would contraindicate participation, as
determined by the Investigator.