Imaging and math combine to illuminate aggressive biomarkers in DCIS
When a woman is diagnosed with the earliest stage of breast cancer, how aggressive should her treatment be? Will the non-invasive cancer become invasive? Or is it a slow-growing variety that will likely never be harmful?
Researchers at the University of Michigan developed a new technology that can identify aggressive forms of ductal carcinoma in situ, or stage 0 breast cancer, from non-aggressive varieties.
The technique combines imaging and mathematics. It's called biomarker ratio imaging microscopy, or BRIM.
"A patient with DCIS is typically treated as if she has invasive disease, which is easy to understand. When women hear breast cancer, they're petrified. And physicians are keenly concerned about outcomes as well," says study author Howard R. Petty, Ph.D., professor of ophthalmology and visual sciences and of microbiology and immunology.
"But, DCIS is not the same disease for everyone. If we can identify potentially non-aggressive lesions, perhaps those women don't need aggressive treatment."
BRIM combines traditional pathology techniques and fuses it with mathematical analysis to determine the relative levels of certain biomarkers in a tumor.
Petty and co-author Andrea J. Clark looked at biopsy samples from 23 patients with DCIS. They used fluorescence imaging, in which tumors are stained to identify key biomarkers. Each biomarker was stained a different color. The stained samples were then entered into a computer program that determines the ratio of biomarker in each pixel.
Some biomarkers are highly expressed in cancer; others have very low expression. With BRIM, researchers take the ratio of expression. This means high and low do not cancel each other out, but rather combine to form an image of improved contrast.
Using this technique, researchers could separate the DCIS patient samples into those with a lot of cancer stem cells - which are highly aggressive - and those that resembled benign tumors. They found 22 percent of the samples had low scores suggestive of very slow-growing, non-aggressive disease.
"This approach is going to be a new and powerful one. It works because we're looking at it mathematically," Petty says. The results are published in the Nature journal Scientific Reports.
Ratio imaging microscopy was used in the 1990s to look at calcium signals. Here, the researchers resurrected this technique and applied it using antibodies and biomarkers.
Biomarkers were selected based on an extensive literature search. The researchers suggest that another advantage to BRIM is that it combines multiple biomarkers, rather than relying on a single marker.
Rates of ductal carcinoma in situ have increased since screening mammography became common. Some experts believe that DCIS can become invasive breast cancer, but this has not been proven. Currently, there is not a way to stratify the disease based on aggressiveness.
The researchers suggest that in addition to preventing overtreatment, BRIM could be used to help more broadly with breast cancer treatment decisions. As the biomarker literature becomes more expansive in other cancer types, the researchers say they will expand their work to other forms of cancer.
They plan to conduct a large retrospective study correlating BRIM scores to patient outcomes.
This technique is not currently available in the clinic. To learn about treatment options for DCIS or invasive breast cancer, contact the U-M Cancer AnswerLine at 800-865-1125.
Funding for this study is from the Mildred E. Swanson Foundation and the National Institutes of Health grant EY007003.
Disclosure: The University of Michigan has filed for patent protection on this technology and is currently assessing options to advance it toward market.
Reference: Scientific Reports, doi: 10.1038/srep27039
U-M Cancer AnswerLine, 800-865-1125
U-M Comprehensive Cancer Center, http://www.
Clinical trials at U-M, http://www.
mCancerTalk blog, http://uofmhealthblogs.
Nicole Fawcett | EurekAlert!
Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery
20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH
Seeking structure with metagenome sequences
20.01.2017 | DOE/Joint Genome Institute
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences