, according to experts who say the dramatic increase reflects a growing understanding among both researchers and patients that low-grade prostate tumors can be safely watched for years without requiring treatment.
Roughly 60% of men eligible for AS chose that approach in 2021, up from 27% in 2014 and less than 10% in 2010, according to panel member Matthew Cooperberg, MD, MPH, of University of California, San Francisco. He presented the data for a panel of the American Urological Association (AUA) at the group’s annual meeting in New Orleans.
Dr. Cooperberg attributed the hike in AS rates in the United States to the growing scientific literature and guidelines supportive of the approach, which calls for periodic assessments of low-risk tumors but no surgery, radiation, or other therapies. In Canada and parts of Europe, approximately 80%-90% of men who are eligible for AS choose that approach, experts said.
Earlier this month, the AUA and the American Society for Radiation Oncology released the strongest guidelines to date supporting AS for low-risk patients, and, for the first time, for select patients with favorable intermediate-risk prostate cancer.
In 2012, the U.S. Preventative Services Task Force (USPSTF) recommended against screening for prostate-specific antigen (PSA), concluding that the benefits of the test did not outweigh the risks, such as overdiagnosis and overtreatment of low-risk prostate cancer.
Urologists blamed the USPSTF policy for a decline in PSA screening and an uptick in the diagnosis of advanced prostate cancer.
Dr. Cooperberg said the shift served as “a bit of a wake-up call for at least a segment of the urology community that if we didn’t fix the overtreatment problem, we would never retake the chunks of the conversation about screening and early detection.”
In 2018, following protests by urologists and patient advocates, the USPSTF revised its statements to include shared decisionmaking for PSA testing in men aged 55-69 years, reflecting emerging evidence of longer-term benefits and widespread adoption of active surveillance after detection of low-risk disease.
Laurence Klotz, MD, the University of Toronto researcher who named and helped develop AS 30 years ago, and who was not on the AUA panel, said other factors also help to explain the growing interest in AS. These include an increasing consensus among experts on the value of the strategy, mounting public awareness of its benefits, the efforts of support and advocacy groups, and the arrival of more sophisticated imaging and biomarkers that help further refine risk.
“We’re shrinking the gray zone,” Dr. Klotz said. “Remaining resistance to AS is due to legitimate concerns about missing significant cancer and losing a patient to metastatic disease, and perhaps financial drivers, particularly with less invasive technologies like radiation and focal therapy.”
The national rate for AS increased from 26.5% in 2014, when data were first reported through the AUA’s AQUA data registry. AQUA’s data comes from electronic health records and included 27,289 patients with newly diagnosed low-risk prostate cancer.
In 2014, radical prostatectomy was the leading treatment in the low-risk population, with 29.7% of these patients overall opting for surgery, edging out external beam radiotherapy (EBRT) and AS, at 28.2% and 26.5% respectively.
In 2015, AS and EBRT overtook surgery, and by 2021, 59.6% of low-risk patients had chosen AS, followed by 20.9% for EBRT and 15.8% for prostatectomy.