Detection of High Grade Prostate Cancer With Subharmonic Ultrasound Imaging, A Pilot Study
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|ClinicalTrials.gov Identifier: NCT02967458|
Recruitment Status : Completed
First Posted : November 18, 2016
Results First Posted : May 21, 2019
Last Update Posted : May 21, 2019
This is a phase II single center study using contrast-enhanced ultrasound to identify aggressive forms of prostate cancer with subharmonic imaging.
The following are the study objectives:
- To implement subharmonic imaging technology on a transrectal probe suitable for prostate imaging and biopsy
- To demonstrate visualization of prostatic vascularity using subharmonic contrast-enhanced imaging.
- To provide a preliminary estimate of the diagnostic accuracy of contrast-enhanced subharmonic imaging for detection of clinically significant PCa.
The study will include 50 subjects who are scheduled for prostate biopsy. Each subject will receive an intravenous infusion of microbubble contrast material immediately prior to a prostate biopsy procedure. The study will demonstrate whether subharmonic imaging with a microbubble contrast agent allows for detection of clinically significant prostate cancer.
|Condition or disease||Intervention/treatment||Phase|
|Prostatic Neoplasm||Drug: Perflutren Lipid Microsphere Intravenous Suspension||Phase 2|
Background: Prostate cancer (PCa) is the most frequently diagnosed cancer among American males, accounting for 27 % of new cancer diagnoses, but it is directly responsible for only 9.5 % of cancer related deaths. Two recently published clinical trials suggest that overdiagnosis and overtreatment of potentially insignificant cancer is a major drawback of prostate cancer screening, and point to the need for a more specific screening tool that can identify clinically significant prostate cancer. The US-based Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial failed to show a mortality benefit from screening and treatment of prostate cancer. The European Randomized Study of Screening for Prostate Cancer (ERSPC) suggests that with the current standard of care, 1410 men must be screened and 48 additional cases of prostate cancer treated to prevent one death from prostate cancer. Based upon these trials, the U.S. Preventive Services Task Force (USPSTF) has issued a grade "D" recommendation against PSA-based screening for PCa.
Contrast-Enhanced Ultrasound: Recent studies have demonstrated that contrast-enhanced harmonic imaging (HI) can identify enhancement related to vascular flow in higher grade PCa, and that HI can selectively detect patients with "clinically significant" PCa that are most likely to benefit from therapy. Subharmonic imaging (SHI) is a newer technology for contrast-enhanced ultrasound imaging that provides a 10-fold improvement in the signal to background ratio for visualization of small vascular structures, but has not been previously implemented on a transrectal ultrasound probe. SHI of the prostate is expected to advance the imaging of prostatic neovascularity and to improve selective biopsy of clinically significant PCa.
Objective: To adapt SHI to a transrectal probe appropriate for prostate imaging and biopsy (over the first 6 months of this study). The subsequent 18 month pilot clinical study will enroll 50 participants who have a clinical indication for prostate biopsy to quantify SHI for the detection of clinically significant PCa (defined as: Gleason score ≥ 7, a single core with > 50 % involvement, or > 25 % of biopsy cores positive for PCa).
Approach: Each participant will undergo a transrectal ultrasound evaluation of the prostate with conventional grayscale and color Doppler imaging, as well as contrast-enhanced imaging with color Doppler, HI and SHI approaches. Imaging results from each of these techniques will be recorded, but only the SHI findings will be used to guide a targeted biopsy of the prostate. A maximum of 6 targeted biopsy cores will be obtained from each participant, based upon suspicious areas identified with SHI. Following the targeted biopsy, each participant will also receive a 12-part systematic biopsy consisting of 6 laterally directed biopsy cores and 6 medially directed biopsy cores. The pilot study is designed to estimate the detection of clinically significant cancer that will be obtained with targeted biopsy based upon SHI along with the medially directed systematic sextant biopsy cores (≤ 12 cores total).
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||55 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||Detection of High Grade Prostate Cancer With Subharmonic Ultrasound Imaging, A Pilot Study|
|Actual Study Start Date :||February 1, 2017|
|Actual Primary Completion Date :||February 1, 2018|
|Actual Study Completion Date :||September 20, 2018|
Experimental: Prostate Biopsy Patients
Fifty patients who are scheduled for a clinically indicated prostate biopsy, and who are able to undergo contrast enhanced transrectal ultrasound will be included in this single arm study. Each of the study subjects will receive in intravenous infusion of a microbubble contrast agent known as Definity™, (Perflutren Lipid Microsphere, Lantheus Medical Imaging, Inc; N. Billerica, MA). Based upon our previous experience, two vials of Perflutren Lipid Microsphere will be mixed and diluted in 50 ml of normal saline, yielding a concentration of 49.4 μl/ml. For the purpose of contrast-enhanced imaging, Perflutren Lipid Microsphere will be infused over approximately 10-12 minutes, during which time ultrasound imaging and biopsy will be performed.
Drug: Perflutren Lipid Microsphere Intravenous Suspension
The intravenous administration of Perflutren Lipid Microsphere will provide enhancement of vascular tissue when performing subharmonic prostate ultrasound imaging. This enhancement will be used to guide targeted biopsy of the prostate to vascular areas which are more likely to contain aggressive prostate cancer.
Other Name: Definity™ (Lantheus Medical Imaging, Inc; N. Billerica, MA)
- Percentage of Subjects Whose Prostate Cancer Was Detected With Subharmonic Imaging [ Time Frame: One week from baseline ]The initial phase of the trial will develop and test subharmonic imaging to demonstrate enhanced visualization of prostate vascularity in all study participants. We will report the percentage of study subjects in whom visualization of prostate vascularity is increased with subharmonic imaging.
- Percentage of Biopsy Cores in Which Prostate Cancer Was Detected Using Subharmonic Imaging [ Time Frame: One week from baseline ]Study subjects will be scanned with subharmonic imaging during infusion of the microbubble contrast agent. Imaging results will be compared to pathology on prostate biopsy.
- Percentage of Subjects With Previously Unidentified Prostate Cancer Using Magnetic Resonance Imaging [ Time Frame: One week from baseline ]Study subjects will be scanned with subharmonic imaging during infusion of the microbubble contrast agent. Imaging results will be compared to pathology on prostate biopsy.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02967458
|United States, Pennsylvania|
|Thomas Jefferson University Hospital|
|Philadelphia, Pennsylvania, United States, 19107|
|Principal Investigator:||Ethan J Halpern, MD||Thomas Jefferson University|
|Principal Investigator:||Flemming Forsberg, PhD||Thomas Jefferson University|