This new technology could replace needle biopsies and allow physicians to detect rejection of transplanted organs earlier, saving patients’ lives
Anatomic pathologists
may be reading fewer biopsy reports for patients with organ transplants in the
future. That’s thanks to a new technology that may be more sensitive to and
capable of detecting organ rejection earlier than traditional needle biopsies.
When clinicians can detect organ transplant rejection
earlier, patients survive longer. Unfortunately, extensive organ damage may
have already occurred by the time rejection is detected through a traditional
needle biopsy. This led a group of researchers at Emory University School of Medicine to
search for a better method for detecting organ rejection in patients with transplants.
The Emory researchers describe the method and technology
they devised in a paper published in Nature Biomedical
Engineering, titled, “Non-Invasive Early Detection of Acute Transplant
Rejection Via Nanosensors of Granzyme B Activity.” The new technology could
make it easier for clinicians to detect when a patient’s body is rejecting a
transplanted organ at an earlier time than traditional methods.
This technology also provides a running measure of processes,
so clinicians have more powerful tools for deciding on the most appropriate
dosage of immunosuppressant
drugs.
“Right now, most tests are aimed at organ dysfunction, and
sometimes they don’t signal there is a problem until organ function is below 50
percent,” Andrew
Adams, MD, PhD Co-Principal Investigator and an Associate Professor of Surgery
at Emory University School of Medicine, in a Georgia
Institute of Technology news release.
How the Technology Works
The method that Adams and his colleagues tested involves the
detection of granzyme B,
a serine protease
often found in the granules of natural killer cells
(NK cells) and cytotoxic
T cells. “Before any organ damage can happen, T cells have to produce granzyme
B, which is why this is an early detection method,” said Gabe Kwong, PhD, Assistant
Professor in the Wallace H. Coulter Department of Biomedical Engineering at
Georgia Tech and Emory University, in the news release.
The new technology is made up of sensor nanoparticles in the
shape of a ball with iron oxide in the middle. Amino acids stick out of the
ball like bristles. Each amino acid has a fluorescent molecule attached to the
tip.
The nanoparticles are injected into the patient. Their size
prevents them from gathering in the patient’s tissue or from being flushed out
through the kidneys. They are designed to accumulate in the tissue of the
transplanted organ.
If the T cells in the transplanted organ begin to produce
granzyme B, the amino acids break away from the nanoparticles, releasing the
fluorescent molecules attached to their tips. Those molecules are small enough
to be processed through the kidneys and can be detected in the patient’s urine.
Pathologists Play Crucial Role on Transplant Teams
Anatomical pathologists (histopathologists in the UK) are key
members of transplant teams for many reasons, including their ability to assess
biopsies. The current method for detecting organ transplant rejection involves
needle biopsies. It is considered the gold standard.
However, according to a paper published in the International
Journal of Organ Transplantation Medicine: “Although imaging studies
and laboratory findings are important and helpful in monitoring of the
transplanted liver, in many circumstances they are not sensitive enough. For
conditions such as rejection of the transplant, liver histology remains the
gold-standard test for the diagnosis of allograft dysfunction. Therefore,
histopathologic assessments of allograft liver
biopsies have an important role in managing patients who have undergone liver
transplantation.”
There are two main problems with needle biopsies. The first,
as mentioned above, is that they don’t always catch the rejection soon enough.
The second is that the needle may cause damage to the transplanted organ.
“The biggest risk of a biopsy is bleeding and injury to the transplanted organ,” noted Andrew Adams, MD, PhD (above), Co-Principal Investigator and an Associate Professor of Surgery at Emory University School of Medicine, in the Georgia Tech news release. “Then there’s the possibility of infection. You’re also just taking a tiny fraction of the transplanted organ to determine what’s going on with the whole organ, and you may miss rejection or misdiagnose it because the needle didn’t hit the right spot,” he added.
And, according to Kwong, even though biopsies are the gold
standard, the results represent one moment in time. “The biopsy is not
predictive. It’s a static snapshot. It’s like looking at a photo of people in
mid-jump. You don’t know if they’re on their way up or on their way down. With
a biopsy, you don’t know whether rejection is progressing or regressing.”
Future Directions of Emory’s Research
The research conducted by Adams and Kwong, et al, is in its
early stages, and the new technology they created won’t be ready to be used on patients
for some time. Nevertheless, there’s reason to be excited.
Nanoparticles are not nearly as invasive as a needle biopsy.
Thus, risk of infection or damaging the transplanted organ is much lower. And Emory’s
technology would allow for much earlier detection, as well as giving clinicians
a better way to adjust the dose of immunosuppressant drugs the patient takes.
“Adjusting the dose is very difficult but very important
because heavy immunosuppression increases occurrence of infections and patients
who receive it also get cancer more often,” said Kwong. The new technology
provides a method of measuring biological activity rates, which would give
clinicians a clearer picture of what’s happening.
The Emory team’s plan is to enhance the new sensors to
detect at least one other major cause of transplant rejection—antibodies. When
a patient’s body rejects a transplanted organ, it produces antibodies to
neutralize what it sees as a foreign entity.
“Antibodies kill their target cells through similar types of
enzymes. In the future, we envision a single sensor to detect both types of
rejection,” said Kwong.
Adams adds, “This method could be adapted to tease out
multiple problems like rejection, infection, or injury to the transplanted
organ. The treatments for all of those are different, so we could select the
proper treatment or combination of treatments and also use the test to measure
how effective treatment is.”
This line of research at Emory University demonstrates how
expanding knowledge in a variety of fields can be combined in new ways. As this
happens, medical laboratories not only get new biomarkers that can be
clinically useful without the need for invasive procedures like needle biopsies,
but these same biomarkers can guide the selection of more effective therapies.
Another big question is whether the lobbying of medical laboratory and pathology societies can educate and convince members of Congress to delay and reform the PAMA Final Rule that uses the market price study of what private payers pay for lab tests
The bad news doesn’t stop there. Lab industry observers say that significant numbers of hospital laboratories and independent lab companies are unprepared for the drop in revenue they will experience once the Medicare price cuts take effect. And, with only 157 days remaining before Jan. 1, 2018, medical laboratory executives and pathologists have precious little time to prepare their labs to operate on significantly less Medicare revenue.
PAMA Market Study of What Private Payers Pay for Clinical Laboratory Tests
Blame it on the Protecting Access to Medicare Act (PAMA) of 2014! PAMA directed CMS to conduct a market study of the lab test prices paid by private health insurers, and then use this data to set the prices of the CLFS. As many lab professionals know, CMS spent the last 24 months publishing a final price reporting rule that defined which medical laboratories must report the prices they are paid by private payers, and then collecting that data.
The data reporting period ended on May 31. In coming months, CMS will publish the new CLFS test prices and allow time for public comment.
First Opportunity to See What Private Payers Pay for Medical Laboratory Tests
The first expert to speak is Lâle White, Executive Chairman and CEO of XIFIN, Inc., a health information technology (HIT) company headquartered in San Diego. Annually, White and her colleagues handle as many as 300 million lab test claims for hundreds of their clinical laboratory clients. Also, XIFIN is electronically interfaced with every health insurance plan in the US. These two facts mean that White has essentially the same data their lab clients reported to CMS.
During her presentation, White will show you how her company analyzed the real information from hundreds of millions of medical lab test claims that were reimbursed by thousands of private payers. You are in for a big surprise!
Learn Why Medicare Lab Test Fee Cuts Will Be Deep and Painful
XIFIN’s conclusions are based on real-world data. They demonstrate how the CMS final rule was written to direct the way federal officials calculate and set the 2018 Part B clinical laboratory test prices, and reveal why the fee cuts will be deep and painful for the lab industry’s highest-volume tests. You’ll hear facts about XIFIN’s analysis and learn to use that knowledge to model and predict precisely how deep Medicare’s revenue cuts to your lab will be when the new price schedule becomes effective on Jan. 1.
Lâle White (above left), CEO of XIFIN, Inc., spoke at the Executive War College on Laboratory and Pathology Management last May, where she shared insights about the coming price cuts to the Medicare Part B Clinical Laboratory Fee Schedule (CLFS). Julie Scott Allen (above right) is Senior Vice President of the District Policy Group, Drinker Biddle, and represents the National Independent Laboratory Association (NILA) in Washington, DC. White and Allen will be speaking at a special Dark Daily webinar later this week on the current status of the Medicare fee cuts and how lab executives should respond to protect the financial integrity of their labs. (White photo copyright: The Dark Report. White photo by Linda Reineke. Allen photo copyright: Drinker Biddle.)
Because it is generally agreed that CMS officials will target the top 20 lab tests by volume for the deepest price cuts, the actual revenue drop will depend on your mix of tests and the volume of Medicare patients associated with each test. CMS says it will use the weighted median of the private payer lab test price data to determine its new Part B fees.
However, that is a flawed approach and the source of much criticism.
White will show why the weighted median generates a lower price than the use of a weighted average calculation. You’ll see the direct impact that CMS’ use of the weighted median will have on your lab’s Medicare revenue, beginning on Jan. 1.
Understanding Current Developments at CMS and Within Congress
Julie Scott Allen will be the second speaker on the July 20 webinar. She is Senior Vice President, District Policy Group, Drinker Biddle, and represents the National Independent Laboratory Association (NILA) in Washington, DC. In this role, Allen works with officials at CMS, the Department of Health and Human Services (HHS), and with members of Congress on issues relevant to the clinical laboratory members of NILA. She regularly participates as part of the Clinical Laboratory Coalition on these matters.
Allen will give you an up-to-the minute perspective on efforts by the clinical laboratory industry to educate officials within Congress, HHS, and CMS about the consequences of allowing the PAMA final rule price cuts to become effective on January 1, 2018. This is important information you can use to craft strategies to protect your lab’s financial stability. You’ll also recognize opportunities to contact your elected officials in Congress at the time when your input can make an important difference.
The message of many in the Clinical Laboratory Coalition to members of Congress is that, if the PAMA Medicare fee cuts happen as planned, many hospital lab outreach programs and community lab companies in the states and districts of the various Senators and Representatives will probably end up going out of business, filing bankruptcy, or selling to a national lab company.
Behind the Scenes on PAMA Fee Cuts, ACA Repeal-and-Replace
Allen will take you behind the scenes of the inside-the-beltway developments that relate to the coming Medicare Part B clinical laboratory fee cuts. Different players from the clinical laboratory community are in discussions with CMS officials about the need to delay and reform the implementation of these price cuts.
Meanwhile, there are several developments unfolding within Congress that affect clinical laboratories. Yes, one of them is the PAMA final rule on lab price cuts. However, congressional efforts to repeal and replace the Affordable Care Act (ACA) are creating opportunities for different medical specialties—including the profession of laboratory medicine—to advocate for needed reforms in their areas of clinical services.
When clinical laboratory and anatomic pathology leaders are informed, they are more effective in two roles:
Protecting the clinical excellence and financial sustainability of their respective laboratories;
Advocating with government officials and lawmakers on the issues that are important to keeping the nation’s laboratories financially viable and key contributors to improving the quality of patient care.
