2141-V11

The purpose of this study is to see whether combining 2141-V11 with various standard treatments is an effective treatment approach for prostate cancer. 2141-V11 works by activating the immune system to find and kill cancer cells. Researchers will look at whether this treatment approach is able to completely get rid of cancer in participants, and they will check for the presence of minimal residual disease (MRD) in participants. MRD is a small number of cancer cells that can be detected in the body after treatment.

The purpose of this research study is to determine the safety and efficacy of administering a single intracerebral (within the brain) dose of investigational compounds called D2C7-immunotoxin (IT) and 2141-V11 in residual disease (within tumor margins) after surgery, followed by later repeated injections of 2141-V11 in the subcutaneous area (under the skin) around the lymph nodes of the head and neck for adults newly diagnosed with a type of cancerous brain tumor called glioblastoma. The word "investigational" means the study drugs are still being tested in research studies and are not approved by the U.S. Food and Drug Administration (FDA).