Newswise — Biocompatible gold nanoparticles designed to convert near-infrared light to heat have been shown to safely and effectively ablate low- to intermediate-grade tumors within the prostate, according to a study conducted at the Icahn School of Medicine and published in the journal Proceedings of the National Academy of Sciences. This treatment could offer patients a targeted therapy option that would preserve critical structures within the prostate, thus avoiding side effects associated with whole-gland treatment such as prostatectomies.
Prostate cancer is the second leading cause of cancer deaths in men in the United States¾11 percent of men will be diagnosed with the disease in their lifetime. Removal or other whole-gland treatment of the prostate carries risks of urinary incontinence and erectile dysfunction. However, technological advances have provided clinicians with options for focal therapies with fewer complications.
In this study, researchers tested the effectiveness of AuroLase® Therapy, a treatment from medical device company Nanospectra Biosciences that is based on technology invented at Rice University by engineer and chemist Naomi Halas, PhD, and Duke University bioengineer Jennifer West, PhD. The Principal Investigator and lead author, Ardeshir Rastinehad, DO, Associate Professor of Urology, and Radiology, at the Icahn School of Medicine at Mount Sinai, invented the technique used in the clinical trial to target and treat the prostate cancer cells using a custom-built MR US fusion guided platform in collaboration with Philips Healthcare. AuroLase® uses gold-silica nanoshells (GSN), particles Dr. Halas invented that are composed of a silica core and a gold shell with a diameter of 150 nanometers. AuroShells® are designed to absorb energy from near-infrared light and convert it to heat, resulting in selective hyperthermic cell death, without affecting adjacent non-tumorous tissue. The treatment was effectively demonstrated in previous cell studies and animal models. Following treatment, the particles are cleared through the liver, while some remain sequestered in the liver and spleen. There are no known side effects.
Sixteen men aged 58 to 79 with low- to intermediate-grade prostate cancer (Gleason score of 4+3) received GSN infusion. All were diagnosed and treated at The Mount Sinai Hospital using a targeted biopsy technique called magnetic resonance-ultrasound fusion imaging, which uses MRI technology to extract a tissue sample directly from the tumor. Patients underwent GSN infusion and high-precision laser ablation, and received an MRI of the prostate 48-72 hours after the procedure, MRI-targeted fusion biopsies at 3 and 12 months, and a standard biopsy at 12 months. Patients were discharged on the same day as the procedure after several hours of monitoring.
GSN-mediated focal laser ablation was successful in 87.5 percent of lesions treated at one year of follow-up. The goal of researchers was to find an eradication of cancer cells during biopsy.
“Gold-silica nanoshells infusion allows for a focused therapy that treats the cancer, while sparing the rest of the prostate, thus preserving a patient’s quality of life by reducing unwanted side effects, which could include erectile dysfunction and/or the leakage of urine,” said Dr. Rastinehad.
“Mount Sinai’s interventional urology program is research-driven and offers patients minimally invasive treatment therapies that improve quality of life,” said Ash Tewari, MBBS, MCh, Chair of the Department of Urology at the Mount Sinai Health System and the Kyung Hyun Kim, MD Professor of Urology at the Icahn School of Medicine at Mount Sinai. “Dr. Rastinehad’s gold nanoparticle research shows that patients are not only benefiting from this treatment, but also experiencing minimal side effects.”
Dr. Halas, Rice's Stanley C. Moore Professor of Electrical and Computer Engineering and director of Rice's Laboratory for Nanophotonics, invented gold nanoshells. Dr. Halas and Dr. West, the Fitzpatrick Family University Professor of Engineering at Duke University, co-invented the nanoshell-based treatment for photothermal ablation of cancer, which was licensed from Rice by Nanospectra Biosciences.
Researchers from Rice University, Duke University, the University of Michigan, and the University of Texas Health Science Center participated in this study. Funding support was provided by Nanospectra Biosciences. Dr. Rastinehad is a consultant for Nanospectra Biosciences.
About Mount Sinai Health System
The Mount Sinai Health System is New York City's largest integrated delivery system, encompassing eight hospitals, a leading medical school, and a vast network of ambulatory practices throughout the greater New York region. Mount Sinai's vision is to produce the safest care, the highest quality, the highest satisfaction, the best access and the best value of any health system in the nation. The Health System includes approximately 7,480 primary and specialty care physicians; 11 joint-venture ambulatory surgery centers; more than 410 ambulatory practices throughout the five boroughs of New York City, Westchester, Long Island, and Florida; and 31 affiliated community health centers. The Icahn School of Medicine is one of three medical schools that have earned distinction by multiple indicators: ranked in the top 20 by U.S. News & World Report's "Best Medical Schools", aligned with a U.S. News & World Report's "Honor Roll" Hospital, No. 12 in the nation for National Institutes of Health funding, and among the top 10 most innovative research institutions as ranked by the journal Nature in its Nature Innovation Index. This reflects a special level of excellence in education, clinical practice, and research. The Mount Sinai Hospital is ranked No. 14 on U.S. News & World Report's "Honor Roll" of top U.S. hospitals; it is one of the nation's top 20 hospitals in Cardiology/Heart Surgery, Diabetes/Endocrinology, Gastroenterology/GI Surgery, Geriatrics, Gynecology, Nephrology, Neurology/Neurosurgery, and Orthopedics in the 2019-2020 "Best Hospitals" issue. Mount Sinai's Kravis Children's Hospital also is ranked nationally in five out of ten pediatric specialties by U.S. News & World Report. The New York Eye and Ear Infirmary of Mount Sinai is ranked 12th nationally for Ophthalmology. Mount Sinai Beth Israel, Mount Sinai St. Luke's, Mount Sinai West, and South Nassau Communities Hospital are ranked regionally.