The purpose of this study is to evaluate the feasibility and short-term safety and effectiveness of the NanoKnife System when used to ablate localized prostate cancer in intermediate risk subjects with organ-confined prostate cancer. This study will evaluate the feasibility of the NanoKnife System as a focal therapy.

This study will involve six (6) subjects who meet the intermediate risk prostate cancer criteria defined by this protocol. The biopsy and imaging techniques that we will adopt within this trial are multiparametric MRI (mpMRI) and transperineal prostate biopsy (template mapping and/or limited targeted). The subjects' prostate cancer foci, the location of which will be determined by ultrasound guided transperineal prostate biopsy, will be targeted for treatment with the NanoKnife System. The primary objective of this the study will be to evaluate procedural and short-term post treatment safety of the NanoKnife treatment via incidence of adverse events and evaluation of effect on urologic (urinary and erectile) function. The secondary objective of this study is to evaluate the short term efficacy of the NanoKnife treatment. Local efficacy in the area of treatment will be assessed by histological evaluation of transperineal prostate biopsy cores at six (6) months post NanoKnife treatment, to evaluate the ablation zone created by the NanoKnife treatment. Other secondary outcomes include health-related quality of life levels evaluated using validated patient questionnaires. Following the 6 month transperineal prostate biopsy and mpMRI assessment, the data from these 6 subjects will be submitted to FDA for confirmation of short term safety and efficacy.

Inclusion Criteria:

1. Has at least a 10-year life expectancy
2. Have histologically confirmed organ-confined prostate cancer - clinical Stage ≤ T2c
3. Have a PSA ≤ 15 ng/mL or PSA density < 0.15 ng/mL2 if PSA is > 15 ng/mL
4. Has Gleason score 3+4 or 4+3
5. Has 10 mm or less of cancer-bearing prostate tissue in any biopsy core
6. No evidence of extraprostatic extension or seminal vesicle invasion by mpMRI
7. Able to visualize prostate gland adequately on transrectal ultrasound imaging during enrollment evaluation
8. Transperineal targeted prostate biopsies of lesion, plus 12 core systematic biopsies to include adequate sampling of the peripheral zone correlating with an intermediate risk lesion in the area of the MR-visible lesion.
9. A visible lesion on mpMRI that is accessible to Irreversible Electroporation (IRE) treatment
10. A non-MRI visible lesion detected via systematic standard biopsy will not be considered an exclusion condition provided the non-MRI visible lesion is singularly located in the contralateral hemisphere of the prostate; is Gleason 6; and comprises no more than 6mm linear extent of cancer-bearing tissue in a single core on standard biopsy.
11. Must sign a written informed consent
12. Understands and accepts the obligation and is logistically able to present for all scheduled follow-up visits

Exclusion Criteria:

1. Have known hypersensitivity to pancuronium bromide, atricurium or cisatricurium

2. Unfit for anesthesia or have a contraindication for agents listed for paralysis

3. Have an active urinary tract infection (UTI)

4. Have a history of bladder neck contracture

5. Are interested in future fertility

6. Have a history (within 3 years) of inflammatory bowel disease

7. Have a concurrent major debilitating illness

8. Had a malignancy within 5 years, including malignant melanoma, except for prostate cancer or other types of skin cancer

9. Have any active implanted electronic device (e.g., pacemaker)

10. Are unable to catheterize due to a urethral stricture disease

11. Have had prior or current prostate cancer therapies:

    1. Biologic therapy for prostate cancer
    2. Chemotherapy for prostate cancer
    3. Hormonal therapy for prostate cancer within three months of procedure
    4. Radiotherapy for prostate cancer
    5. Surgery for prostate cancer

12. Have had prior transurethral prostatectomy (TURP), stricture surgery, urethral stent or prostatic implants

13. Have had prior major rectal surgery (except hemorrhoids)

14. Unfit for pelvic MRI scanning (e.g., severe claustrophobia, permanent cardiac pacemaker, metallic implants that are likely to contribute significant image artifacts, allergy or contraindication to gadolinium (to enhance MRI)