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Cobalt

* Prostate and proximal seminal vesicles: 2 cobalt gray equivalent per fraction to a total dose of 78 cobalt gray equivalent.
* Simultaneous integrated boost to the IPT: 2.2 cobalt gray equivalent per fraction to a total dose of 85.8 cobalt gray equivalent.

* Prostate, proximal seminal vesicles, and pelvic nodes: 2 cobalt gray equivalent per fraction to a total does of 46 cobalt gray equivalent.
* Prostate and proximal seminal vesicles: 2 cobalt gray equivalent per fraction to a total dose of 32 cobalt gray equivalent.
* Entire uninvolved seminal vesicle when part of the seminal vesicle is involved with tumor: 2 cobalt gray equivalent per fraction to a total dose of 78 cobalt gray equivalent.
* Simultaneous integrated boost to the IPT: 2.2 cobalt gray equivalent per fraction to a total dose of 85.8 cobalt gray equivalent.

The prostate and proximal seminal vesicles will be treated to 2 cobalt gray equivalent per fraction for 39 fractions for a total of 78 cobalt gray equivalent.

Simultaneous integrated boost to the IPT will be delivered to 2.2 cobalt gray equivalent per fraction for 39 fractions for a total of 85.8 cobalt gray equivalent.

Treatment will be given once a day, approximately 5 treatments per week (Monday- Friday), over 8-9 weeks.

HR-A

The prostate, proximal seminal vesicles, and pelvic nodes will be treated to 2 cobalt gray equivalent per fraction for 23 fractions for a total of 46 cobalt gray equivalent.

The prostate and proximal seminal vesicles will be treated to an additional 2 cobalt gray equivalent per fraction for 16 fractions for a total of 32 cobalt gray equivalent.

Electively treat the entire uninvolved seminal vesicle to 2 cobalt gray equivalent per fraction for 39 fractions for a total of 78 cobalt gray equivalent when part of the seminal vesicle is involved with tumor.

Simultaneous integrated boost to the IPT will be delivered to 2.2 cobalt gray equivalent per fraction for 39 fractions for a total of 85.8 cobalt gray equivalent.

Treatment will be given once a day, approximately 5 treatments per week (Monday- Friday), over 8-9 weeks.

HR-B

Curtis M Bryant, MD, MPH

The purpose of this research study is to determine if dose-escalated proton radiation therapy is a good way to treat high-risk prostate cancer. The study features hypofractionation and a simultaneous integrated boost to the magnetic resonance imaging (MRI) identified intraprostatic tumor (IPT) as a method of dose-escalating radiation therapy. The study will include patients with high-risk prostate cancer who are at the highest risk for recurrence. Radiation therapy will be delivered over the course of 8-9 weeks. Additionally, androgen deprivation therapy (ADT) will be started 8-10 weeks prior to starting radiation and continued for a total of 18 months if the patient decides to receive ADT.

Prostate cancer is the most common noncutaneous cancer among men in the United States. The purpose of this research study is to determine if dose-escalated proton radiation therapy is a good way to treat high-risk prostate cancer.

Proton therapy (PT) is a type of ionizing radiation therapy that reduces the dose of excess radiation delivered to normal tissues. By escalating the radiation dose just to the area of the known tumor within the prostate, one could potentially reduce the amount of excess radiation delivered to surrounding organs.This reduction in dose would improve the therapeutic ratio by improving disease control while minimizing the risk for additional toxicity.

In an effort to take advantage of dose escalation's potential for improving disease control but also to limit toxicity, the use of advanced imaging to identify prostate cancer and provide a focal radiation boost to the area have proven to be useful. Recent advances in MRI have made it the most promising technique in identifying and targeting IPTs, improving both cancer control rates and decreasing toxicity.

The study features hypofractionation and a simultaneous integrated boost to the MRI identified intraprostatic tumor (IPT) as a method of dose-escalating radiation therapy. The study will include patients with high-risk prostate cancer who are at the highest risk for recurrence. Radiation therapy will be delivered over the course of 8-9 weeks. Additionally, androgen deprivation therapy (ADT) will be started 8-10 weeks prior to starting radiation and continued for a total of 18 months.

Patients will be assigned to treatment group according to their lymph node risk or seminal vesicle invasion.

2 treatment groups:

* HR-A: Patients with \<15% risk of positive pelvic nodes, without posterior extracapsular extension and negative for seminal vesicle invasion on exam pretreatment diagnostic MRI.
* HR-B: Patient with ≥ 15% risk of positive pelvic nodes or with seminal vesicle invasion, without posterior extracapsular extension.

Prostate cancer is gender-specific. Biological males only.

Dose-Escalated Proton Radiation Therapy for High-Risk Prostate Cancer

A Phase II Study of Dose-Escalated Proton-Based Radiation Therapy Delivered With a Simultaneous Integrated Boost (SIB) to Intraprostatic Tumors (IPT) Visible on Pretreatment Magnetic Resonance Image

Biochemical failure will be defined based on the Phoenix definition. Biochemical failure has occurred if the post-treatment prostate-specific antigen (PSA) on at least two occasions rose more than 2 ng/ml above the PSA nadir. Rate of biochemical failure will be measured at 5 years after the end of treatment.

Assess physician-graded, severe (Grade 3-4), acute (early, within 90 days of treatment) genitourinary and gastrointestinal toxicity rates based on the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.

Assess physician-graded, severe (Grade 3-4), late (beginning 90 or more days after treatment), cumulative 5 year genitourinary and gastrointestinal toxicity rates based on the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.

Assess changes in patient-reported quality of life before and after treatment according to The International Index of Erectile Function (IIEF-5/IIEF-5m) which measures sexual function and the effect of radiation therapy; The International Prostate Symptom Score (IPSS) which measures urinary function and the effect of radiation therapy; and The Expanded Prostate Cancer Index Composite (EPIC) which measures different areas that may be affected by prostate cancer or its treatment.

Assess the overall survival, defined as the time from the start of treatment to the date of death of any cause, if data is available, at 5 years. Also, cause-specific survival will be calculated.

Assess local persistence or local recurrence of prostate cancer at 5 years. Local persistence is defined as the failure of the original abnormal tumor mass seen on cross sectional imaging and/or found on digital rectal exam to resolve in patients who also had a poor PSA response with a PSA nadir greater than 1 ng/mL. Local recurrence is defined as the development of any new abnormal prostate mass on cross sectional imaging or on digital rectal exam with previous exams or imaging showing no mass in the area prior to radiation therapy or after initial treatment.

Assess the cumulative rate development of distant metastasis up to 5 years after end of radiation. This will be an aggregate binary, yes/no response based on evidence acquired from sources including CT scan, bone scan, and/or PET/CT scan.

Spots Global Cancer Trial Database for intraprostatic tumor (ipt)