FDA Approves Genetic Test for Opioid Addiction Risk

By Pat Anson, PNN Editor

The U.S. Food and Drug Administration has approved a controversial genetic test that uses a patient’s DNA to assess whether they are at risk of developing opioid use disorder (OUD).  

Although the test is only intended for patients with short-term acute pain who have not used opioids before, there is concern about the test’s accuracy and whether it will be used “off-label” to assess addiction risk in chronic pain patients – who could potentially lose access to opioids as a result.

In approving the AvertD test, the FDA stipulated that it only be available by prescription to patients who consent to its use and have no prior history of using an oral opioid for pain relief.

The test is administered by a provider swabbing the cheek of a patient to collect a DNA sample, which will then be tested in a laboratory to see if the patient has 15 genetic markers that puts them at elevated risk of OUD.

According to the FDA, the test will help patients “make better informed decisions” about opioids, such as a patient facing surgery who wants to know what analgesic to use for acute post-operative pain.

AUTOGENOMICS IMAGE

"AvertD may help patients who are concerned about being treated with an opioid for acute pain,” Jeff Shuren, MD, director of the FDA's Center for Devices and Radiological Health, said in a statement. “The test is not intended to be used in patients being treated for chronic pain.”

But given the history of opioid guidelines being mistakenly applied to all kinds of patients, regardless of their condition, some worry the test will be misused.

“I’m sure it would be used for anyone who may be considered for opioid therapy,” says Lynn Webster, MD, a pain management expert and Senior Fellow at the Center for U.S. Policy. “I am all for gathering more data to help clinicians make better decisions, but we must exercise caution with such tests. Otherwise, the test may be over-read or misinterpreted. Some patients may be deprived of access to an opioid if they test positive or there can be a false sense of harmlessness from opioids if the test is negative. 

“I am most concerned that providers will see the results as binary. Either a patient will or won’t develop OUD, depending on the result. That would be a big mistake. Any such device or test must be used along with other clinical and personal information to help mitigate harm from using, or being denied, opioids.”

80% Accuracy

As part of its approval order, the FDA is requiring AutoGenomics – the company that makes AvertD – to provide training to healthcare providers on the proper use of the test and to conduct a post-market study of its performance and accuracy.

In 2022, an FDA advisory committee voted 11-2 against recommending an earlier version of AvertD, primarily because of concerns about false-negative and false-positive results. An observational study found the test was about 80% accurate in detecting genes associated with OUD.

"I believe 100% of the risk associated with this test is with false positives and false negatives -- both people being untreated or poorly treated because somehow it came back as a positive result, or being given inappropriate treatment because it said negative," said Timothy Ness, MD, an anesthesiologist and Professor Emeritus at the University of Alabama at Birmingham, an advisory panel member who voted no.

After the advisory committee vote, the FDA worked with AutoGenomics to modify the test and improve its accuracy. The company then submitted a premarket approval application for the modified test, which the FDA granted without going back to the advisory committee for further review.

“The FDA recognizes that in premarket decision-making for devices, there generally exists some uncertainty around benefits and risks. Given the totality of available evidence and the urgent need for medical devices that can make a positive impact on the overdose crisis, and specifically devices that can help assess the risk of developing OUD, the FDA determined that there is a reasonable assurance of AvertD's safety and effectiveness,” said Dr. Shuren.

But no test is foolproof in either its accuracy or implementation, as Dr. Webster learned when he developed a questionnaire that assesses addiction risk by asking patients about their family history and other potential risk factors. Webster was disappointed to learn his questionnaire was “weaponized” by some providers to deny opioid therapy to patients, particularly women with a history being sexually abused.

Webster says the risk of OUD can’t be measured by a genetic test alone.

“We should not think it is a diagnostic tool or a crystal ball. Having an increased risk due to genetics does not mean that, if exposed to an opioid, an individual necessarily will develop an opioid addiction,” Webster told PNN. 

“We have known for a long time that about fifty percent of the risk of developing an opioid addiction is due to genetics. The other fifty percent is due to environmental factors and life’s experience. Furthermore, people can develop OUD without genetic risks. OUD risk is dynamic, meaning it changes over time with adverse events in life and often co-morbid conditions. For example, there was a surge in all forms of drug abuse, including OUD, during the pandemic because of isolation and loneliness. This is not detected by a genetic test.”

Although the risk of a surgery patient misusing opioids or becoming addicted is low – less than one percent -- the parent company of AutoGenomics has a more stark assessment, calling surgery “a gateway to addiction” that puts another 7 million Americans at risk every year.

Large Study Debunks Myths About Rx Opioid Addiction

By Pat Anson, PNN Editor

A large new study in Australia is debunking myths about the addictive nature of opioid pain medication and how a single prescription can lead to long term use.

In an analysis of nearly 3.5 million Australians who were prescribed opioids for the first time, researchers found that 92% never progressed beyond low opioid use and only 3% became persistent users or needed higher doses. The “sustained use” of opioids occurred mostly in seniors (65 and older) suffering from cancer, depression, anxiety and other chronic health problems.

“Results of this cohort study suggest that most individuals commencing treatment with prescription opioids had relatively low and time-limited exposure to opioids over a 5-year period,” wrote lead author Natasa Gisev, PhD, a clinical pharmacist at National Drug and Alcohol Research Centre, UNSW Sydney.

“The small proportion of individuals with sustained or increasing use was older with more comorbidities and use of psychotropic and other analgesic drugs, likely reflecting a higher prevalence of pain and treatment needs in these individuals.”

Previous research estimated the risk of long-term opioid use as high as 57 percent, but Gisev and her colleagues say those studies are flawed because they excluded people with cancer and opioid use disorder, or used various definitions of long-term use. The Australian researchers took a different approach in tracking opioid prescriptions, developing five “trajectories of opioid use.”

The vast majority of patients had very low (75%) or low use (17%) of opioids. Others started with moderate opioid use and decreased to low use (3%), or began with low use and increased to moderate use (3%). Only 3% became sustained users or took higher doses.

Five-Year Trajectories of Opioid Use

JAMA NETWORK OPEN

“Overall, these findings suggest that most people who initiate an opioid prescription are likely to have low, time-limited exposure to opioids with little indication of ongoing use. This possibility is an important consideration for policymakers and stakeholders considering population-level prescribing of high-risk drugs,” researchers reported in JAMA Network Open.

“Opioids are essential drugs for acute and cancer pain, and many people with CNCP (chronic non-cancer pain) benefit from opioids. Continued focus and policy responses based on findings from a small group of people with increased risk of harms run the risk of limiting access to people who safely derive objective benefits from opioids.”  

That’s exactly what happened to millions of pain patients in the US, who lost access to opioids due to steep cuts in prescribing, chronic shortages of opioid medication, and a relentless drumbeat in the media about people becoming addicted or overdosing after one pill.  

“One prescription can be all it takes to lose everything,” the CDC said in a 2017 advertising campaign that emphasized the risks of prescription opioids, while ignoring the far more serious problem of illicit fentanyl and other street drugs.

Just how common is opioid addiction? Estimates are all over the map, ranging as low as 1% to as high as 40% for long-term opioid users.

“The problem with all of these studies is that they are retrospective in nature, limited to a particular patient population, and constrained by the diagnostic criteria in use at the time,” my late colleague Roger Chriss pointed out in a 2019 column on opioid addiction.  

Roger was prescient about the imprecision of diagnostic criteria. A little known 2021 study of U.S. veterans who were diagnosed with opioid use disorder (OUD) challenged how many actually had it. Researchers found that nearly 20% of veterans with OUD used prescription opioids without any signs of abuse and evidence was lacking in another 7% of cases. Less than 60% of the veterans had a “high likelihood” of being correctly diagnosed with OUD.

Feds Warn Kratom Vendors About Marketing for Addiction Treatment

By Pat Anson, PNN Editor

The Food and Drug Administration and Federal Trade Commission have sent warning letters to four kratom vendors saying they are in violation of federal law for selling “unapproved new drugs.” The letters to Herbsen Botanicals, Klarity Kratom, Kratom Exchange and YoKratom primarily focus on their marketing of kratom as a treatment for opioid addiction.

Kratom is a dietary supplement that comes from the leaves of the mitragyna speciosa tree in southeast Asia, where it has been used for centuries as a natural stimulant and pain reliever. In recent years, millions of Americans have discovered kratom and use it to self-treat their pain, anxiety, depression and addiction. Kratom is sold legally in most U.S. states, but vendors can run into trouble if they claim it can be used to treat medical conditions.

“You market kratom products for the treatment or cure of opioid addiction and withdrawal symptoms. However, these products have not been determined by FDA to be safe and effective for these (or any other) uses,” the agencies said in their letter to Herbsen Botanicals. “Further, the unproven treatments could cause patients to forego or delay FDA-approved treatments for opioid addiction or withdrawal. The marketing and sale of unapproved opioid addiction treatment products is a potentially significant threat to the public health.”

The letter cites several blog posts on Herbsen’s website, which claim that kratom is a “common recommendation to manage opioid addiction” and “delivers similar effects” as morphine and codeine. Herbsen also has a lengthy disclaimer on its website saying such statements “are not intended to diagnose, treat, cure or prevent any disease or ailment.”

The FDA has tried for years -- unsuccessfully – to schedule kratom as a controlled substance, which would effectively ban its sale and use in the United States. Having failed to achieve that goal, the agency has resorted to occasional warning letters, import alerts and seizures of kratom.   

In a recently updated online fact sheet, the FDA said kratom’s effects on the brain are similar to morphine and that kratom has “properties that expose users to the risks of addiction, abuse, and dependence.”

‘Kratom Saved My Life’

Addiction treatment is one of the main reasons that people use kratom. In a large PNN survey of over 6,400 kratom users, about one in ten said they primarily used the plant to treat opioid addiction or alcoholism. Several said it was more effective than methadone or Suboxone in relieving withdrawal symptoms.

“Kratom saved my life. I tried every other type of treatment for drug addiction over the past 10 years,” one respondent wrote. “After 2 years of Suboxone, I stopped treatment & began using kratom. I've made more progress toward my ultimate goal of total sobriety in 2 years of self-administered kratom then 5+ years of suboxone & methadone treatment.”

“Due to 3 surgeries, I became hooked on Oxy and had to take Suboxone to get off it. The problem is Suboxone withdrawals were nearly as bad, so I used Kratom to cure that,” said another.

“Not only is this a wonderful alternative for people with chronic pain. but this also could greatly reduce our heroin epidemic crisis going on in our country. After years of being physically dependent on legally prescribed Suboxone, I was unsuccessful at my attempts to get off of them. Kratom made it possible, and I believe would help others trying to get off any opiates and live full and productive life,” another poster said.

In recent testimony before Congress, FDA commissioner Dr. Robert Califf warned that kratom was a harmful substance that has caused “real adverse events, real negative things that have happened to people.” Califf also said the agency may need new authority from Congress to regulate kratom and other supplements that are not “traditional drugs.”