For example, in a 2006 study of 180 men diagnosed with early stage prostate cancer via ultrasound-guided biopsy, nearly a quarter were upgraded to a more clinically significant stage of disease after 3D mapping biopsy found pockets of cancer the first technique had missed. Now, a University of Colorado Cancer Center study reports the locations of these most-missed pockets of prostate cancer.
Traditional, ultrasound-guided biopsies may miss cancer detected by the more accurate 3D mapping biopsies.
“There are three major reason we perform these 3D mapping biopsies in the clinic: first, a man may have rising PSA despite a series of negative biopsies and so want a more detailed opinion; second, a man may prefer additional reassurance that watching and waiting rather than treatment is the best course of action; and third, a man may pursue focal therapy in which only the cancerous sections of the prostate are removed and so need accurate information on the position of his cancer,” says Al Barqawi, MD, investigator at the CU Cancer Center, associate professor at the CU School of Medicine, and the paper’s senior author.
Barqawi is a pioneer of the 3D mapping biopsy technique, in which needle biopsies are taken 5mm apart across the x, y and z axes of a three-dimensional grid through the prostate, and has performed over 600 of the procedures.
The current study enrolled 161 men with a mean age of 61.6 years, who had been diagnosed with low-stage prostate cancer by ultrasound-guided biopsy. The study performed 3D mapping biopsies at a mean 192 days after the first and compared the results. Overall, ultrasound-guided biopsy found an average of 1.38 cancerous zones per patient, whereas 3D mapping biopsy found nearly three times the number of positive zones, at 3.33 per patient.
The follow-up findings from the 3D mapping study resulted in upgrading the severity of many of these seemingly low-grade cancers. Specifically, after first biopsy, 7.5 percent of patients had been graded Gleason 7 – the lowest grade at which treatment is considered “medium risk” and for which treatment is a reasonable option – and after second biopsy the percentage increased to twenty-five. After first biopsy, no patients had been scored above Gleason 7, and after 3D mapping biopsy, 4 percent were found to have Gleason 8, and 2 percent had Gleason 9.
“But we already knew that 3D mapping was likely to upgrade a prostate cancer’s Gleason score,” Barqawi says. “What we hoped to discover in this study is exactly where cancer is being missed by ultrasound-guided biopsy.”
Of these 161 total cases, cancer was found in the left-mid section of the prostate 62 times after it had been missed by ultrasound-guided biopsy. Likewise, 3D mapping found 62 unreported cancers in the right-mid section and 41 undetected cancers in the left-apex zone.
“This study adds to our knowledge about the interface and best uses of these two techniques. The cost and invasiveness of 3d mapping biopsy make it inappropriate for screening, but our message is that with the confirmation or strong suspicion of cancer, 3D mapping biopsy offers a much more accurate assessment of the location, stage and risk,” Barqawi says.
Garth Sundem | EurekAlert!
Bionic eye clinical trial results show long-term safety, efficacy vision-restoring implant
24.06.2015 | American Academy of Ophthalmology
The new version of syngo.via supports treatment decision-making in oncology
17.06.2015 | Siemens AG
Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.
The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...
New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions
A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...
A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...
The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...
25.06.2015 | Event News
16.06.2015 | Event News
11.06.2015 | Event News
03.07.2015 | Press release
03.07.2015 | Agricultural and Forestry Science
03.07.2015 | Health and Medicine