Stereotactic Body Radiotherapy (SBRT) With Concurrent Boost for Low- and Intermediate-Risk Prostate Cancer

Rocky Mountain Cancer Centers

Overview

The purpose of this study is to determine whether stereotactic body radiation therapy (SBRT) with simultaneous boost (higher radiation dose) to areas within the prostate with more prominent cancerous growth (intraprostatic lesions) utilizing intensity modulated radiotherapy (IMRT) planning techniques is a safe and effective treatment in patients with low- and intermediate-risk localized prostate cancer.

Standard external beam radiation therapy (EBRT) for low- to intermediate-risk prostate cancer involves several weeks of daily treatment sessions. Stereotactic body radiation therapy (SBRT) is a newer form of EBRT that gives fewer treatments but higher doses of radiation per treatment. In many patients there are certain areas within the prostate with more prominent cancerous growth (intraprostatic lesions), which may require higher doses of radiation (boost) to treat effectively. This study will treat the prostate with simultaneous boost(s) to intraprostatic lesion(s) in 5 treatments over 10-14 days.

Study Type

INTERVENTIONAL

Allocation

Purpose

TREATMENT

Masking

NONE

Conditions

Prostate Cancer

Interventions

Prostate SBRT with concurrent boost to intraprostatic lesion(s)RADIATION

40 Gy in 5 fractions to prostate for low-risk and 45 Gy in 5 fractions to prostate for intermediate-risk patients, and 50 Gy in 5 fractions to intraprostatic lesion(s), delivered over 10-14 days on preferably every other day.

Eligibility

Sex: MALEMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Histologically proven diagnosis of prostate adenocarcinoma within one year * Gleason Score 2-7 * Clinical T-stage T1b-T2c (AJCC 7th Edition) * Clinical Nx or N0, and Mx or M0 * PSA \< 20 ng/mL * Low or intermediate risk according to NCCN guidelines: Low: Clinical Stage (CS) T1b-T2a and Gleason 2-6 and PSA \< 10 ng/ml; Intermediate: CS T2b-T2c and Gleason 2-6 and PSA \< 10 ng/ml, or CS T1b-T2a and Gleason 7 and PSA \< 10 ng/ml, or CS T1b-T2a and Gleason 2-6 and PSA 10-20ng/mL * ECOG performance status 0 or 1 * Has had a pre-treatment PSA drawn within a month of the beginning of protocol therapy * If androgen-deprivation therapy (ADT) has been initiated, must have a documented pre-ADT PSA; this baseline PSA should not be obtained during following periods: 1) 10-day period following prostate biopsy; 2) within 30 days after discontinuation of finasteride; or 3) within 90 days after discontinuation of dutasteride. * Has completed a baseline health-related quality of life assessment Extended Prostate Cancer Index Composite questionnaire (EPIC-26) * Has had a history and physical examination (including digital rectal examination and a formal morbidity assessment via the ACE-27) within 60 days * Morbidity score (via the ACE-27) of none (0), mild (1) or moderate (2) * Willing and able to use adequate contraception during protocol treatment and for 3 months after the completion of protocol treatment Exclusion Criteria: * Invasive (carcinoma in situ is allowed) solid or hematologic malignancy (other than this prostate cancer, or basal or squamous skin cancers) in the last 5 years * Prior prostatectomy or cryotherapy of the prostate * Prior radiotherapy to the prostate or lower pelvis * Prior or concurrent cytotoxic chemotherapy for prostate cancer (prior chemotherapy for a different cancer is allowed) * Implanted hardware near the planning target volume that would prohibit appropriate treatment planning or treatment delivery in the investigator's opinion

Locations (2)

Rocky Mountain Cancer Centers - Aurora

Aurora, Colorado, United States

Rocky Mountain Cancer Centers - Littleton

Littleton, Colorado, United States

Outcomes

Primary Outcomes

Biochemical disease-free survival

Biochemical Disease-Free Survival (bDFS), the time from completion of protocol treatment to the documented PSA rise of 2 ng/mL above the PSA nadir reached after treatment.

Time frame: 5-8 years

Secondary Outcomes

Grade 2 or higher acute gastrointestinal, genitourinary, and erectile toxicities

Grade 2 or higher acute gastrointestinal, genitourinary, and erectile toxicities, graded per CTCAE 3.0. Acute adverse events will be recorded as the first occurrence of worst severity of the adverse event ≤ 30 days from completion of protocol radiotherapy.

Time frame: 30 days from completion of protocol radiotherapy

Grade 3 or higher late gastrointestinal, genitourinary, and erectile toxicities

Grade 3 or higher late gastrointestinal, genitourinary, and erectile toxicities, graded per CTCAE 3.0. Late adverse events are defined as the first occurrence of a late grade 3+ adverse event \> 30 days from completion of protocol radiotherapy.

Time frame: >30 days to 5 years from completion of protocol radiotherapy

Freedom from failure

Freedom from failure, defined as the time from the first date of radiation to first event of biochemical failure (nadir + 2 ng/mL), local recurrence, regional recurrence, or distant disease as defined below.

Time frame: 5-8 years

Local recurrence-free survival

Local recurrence-free survival, defined as the time from the first date of radiation to first pathologic confirmation of in-prostate tumor recurrence. The local recurrence will be dated when the palpable progression was first identified. In the event of biochemical failure followed by negative metastatic workup and positive biopsy for in-prostate recurrence, the local recurrence will be dated the date of the documented biochemical failure.

Data from ClinicalTrials.gov

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