Study of STM-416p Administered to Patients Undergoing Radical Prostatectomy

Inclusion Criteria:

1. Males aged 18 years or older at time of informed consent.
2. Have a histologically confirmed diagnosis of prostate cancer, and are scheduled to undergo radical prostatectomy within 28 days of screening.
3. Grade Group 2-5.
4. Eastern Cooperative Oncology Group (ECOG) Performance Status ≤2 at Screening.
5. Have adequate organ and bone marrow function at screening.
6. Able to understand and be willing to sign an Institutional Review Board/Ethics Committee-approved written informed consent document

Exclusion Criteria:

1. Have an invasive malignancy, other than the disease under study.
2. Anticipated to require the use of a drain after radical prostatectomy.
3. Received any other anticancer therapy (e.g., including but not limited to chemotherapy, biologic therapy, immunotherapy, targeted therapy, endocrine therapy, radiation therapy, intravesical therapy ) within 28 days.
4. History of allergic reactions attributed to compounds of similar chemical or biologic composition as those used in the STM-416p formulation including poloxamer 407 and sodium hyaluronate.
5. History of allogeneic organ transplant.
6. History of primary immunodeficiency.
7. QTc interval \>470 msec at Screening.