One Third of Knee Surgery Patients Still Have Pain

By Liz Szabo, Kaiser Health News

Danette Lake thought surgery would relieve the pain in her knees.

The arthritis pain began as a dull ache in her early 40s, brought on largely by the pressure of unwanted weight. Lake managed to lose 200 pounds through dieting and exercise, but the pain in her knees persisted.

A sexual assault two years ago left Lake with physical and psychological trauma. She damaged her knees while fighting off her attacker, who had broken into her home. Although she managed to escape, her knees never recovered. At times, the sharp pain drove her to the emergency room. Lake’s job, which involved loading luggage onto airplanes, often left her in misery.

When a doctor said that knee replacement would reduce her arthritis pain by 75 percent, Lake was overjoyed.

“I thought the knee replacement was going to be a cure,” said Lake, now 52 and living in rural Iowa. “I got all excited, thinking, ‘Finally, the pain is going to end and I will have some quality of life.’”

But one year after surgery on her right knee, Lake said she’s still suffering.

“I’m in constant pain, 24/7,” said Lake, who is too disabled to work. “There are times when I can’t even sleep.”

Most knee replacements are considered successful, and the procedure is known for being safe and cost-effective. Rates of the surgery doubled from 1999 to 2008, with 3.5 million procedures a year expected by 2030.

But Lake’s ordeal illustrates the surgery’s risks and limitations. Doctors are increasingly concerned that the procedure is overused and that its benefits have been oversold.

DANETTE LAKE (khn photo)

Research suggests that up to one-third of those who have knees replaced continue to experience chronic pain, while 1 in 5 are dissatisfied with the results. A study published last year in the BMJ found that knee replacement had “minimal effects on quality of life,” especially for patients with less severe arthritis.

One-third of patients who undergo knee replacement may not even be appropriate candidates for the procedure, because their arthritis symptoms aren’t severe enough to merit aggressive intervention, according to a 2014 study in Arthritis & Rheumatology.

“We do too many knee replacements,” said Dr. James Rickert, president of the Society for Patient Centered Orthopedics, which advocates for affordable health care, in an interview. “People will argue about the exact amount. But hardly anyone would argue that we don’t do too many.”

Although Americans are aging and getting heavier, those factors alone don’t explain the explosive growth in knee replacement. The increase may be fueled by a higher rate of injuries among younger patients and doctors’ greater willingness to operate on younger people, such as those in their 50s and early 60s, said Rickert, an orthopedic surgeon in Bedford, Ind. That shift has occurred because new implants can last longer — perhaps 20 years — before wearing out.

Yet even the newest models don’t last forever. Over time, implants can loosen and detach from the bone, causing pain. Plastic components of the artificial knee slowly wear out, creating debris that can cause inflammation. The wear and tear can cause the knee to break. Patients who remain obese after surgery can put extra pressure on implants, further shortening their lifespan.

The younger patients are, the more likely they are to “outlive” their knee implants and require a second surgery. Such “revision” procedures are more difficult to perform for many reasons, including the presence of scar tissue from the original surgery. Bone cement used in the first surgery also can be difficult to extract, and bones can fracture as the older artificial knee is removed, Rickert said.

Revisions are also more likely to cause complications. Among patients younger than 60, about 35 percent of men need a revision surgery, along with 20 percent of women, according to a November article in the Lancet.

Yet hospitals and surgery centers market knee replacements heavily, with ads that show patients running, bicycling, even playing basketball after the procedure, said Dr. Nicholas DiNubile, a Havertown, Pa., orthopedic surgeon specializing in sports medicine. While many people with artificial knees can return to moderate exercise — such as doubles tennis — it’s unrealistic to imagine them playing full-court basketball again, he said.

“Hospitals are all competing with each other,” DiNubile said. Marketing can mislead younger patients into thinking, “‘I’ll get a new joint and go back to doing everything I did before,’” he said. To Rickert, “medical advertising is a big part of the problem. Its purpose is to sell patients on the procedures.”

Rickert said that some patients are offered surgery they don’t need and that money can be a factor.

Knee replacements, which cost $31,000 on average, are “really crucial to the financial health of hospitals and doctors’ practices,” he said. “The doctor earns a lot more if they do the surgery.”

Ignoring Alternatives

Yet surgery isn’t the only way to treat arthritis.

Patients with early disease often benefit from over-the-counter pain relievers, dietary advice, physical therapy and education about their condition, said Daniel Riddle, a physical therapy researcher and professor at Virginia Commonwealth University in Richmond.

Studies show that these approaches can even help people with more severe arthritis.

In a study published in Osteoarthritis and Cartilage in April, researchers compared surgical and non-surgical treatments in 100 older patients eligible for knee replacement.

Over two years, all of the patients improved, whether they were offered surgery or a combination of non-surgical therapies. Patients randomly assigned to undergo immediate knee replacement did better, improving twice as much as those given combination therapy, as measured on standard medical tests of pain and functioning.

But surgery also carried risks. Surgical patients developed four times as many complications, including infections, blood clots or knee stiffness severe enough to require another medical procedure under anesthesia. In general, 1 in every 100 to 200 patients who undergo a knee replacement die within 90 days of surgery.

Significantly, most of those treated with non-surgical therapies were satisfied with their progress. Although all were eligible to have knee replacement later, two-thirds chose not to do it.

Tia Floyd Williams suffered from painful arthritis for 15 years before having a knee replaced in September 2017. Although the procedure seemed to go smoothly, her pain returned after about four months, spreading to her hips and lower back.

She was told she needed a second, more extensive surgery to put a rod in her lower leg, said Williams, 52, of Nashville.

“At this point, I thought I would be getting a second knee done, not redoing the first one,” Williams said.

Other patients, such as Ellen Stutts, are happy with their results. Stutts, in Durham, N.C., had one knee replaced in 2016 and the other replaced this year. “It’s definitely better than before the surgery,” Stutts said.

Inappropriate Surgeries

Doctors and economists are increasingly concerned about inappropriate joint surgery of all types, not just knees.

Inappropriate treatment doesn’t harm only patients; it harms the health care system by raising costs for everyone, said Dr. John Mafi, an assistant professor of medicine at the David Geffen School of Medicine at UCLA.

The 723,000 knee replacements performed in 2014 cost patients, insurers and taxpayers more than $40 billion. Those costs are projected to surge as the nation ages and grapples with the effects of the obesity epidemic, and an aging population.

To avoid inappropriate joint replacements, some health systems are developing “decision aids,” easy-to-understand written materials and videos about the risks, benefits and limits of surgery to help patients make more informed choices.

In 2009, Group Health introduced decision aids for patients considering joint replacement for hips and knees.

Blue Shield of California implemented a similar “shared decision-making” initiative.

Executives at the health plan have been especially concerned about the big increase in younger patients undergoing knee replacement surgery, said Henry Garlich, director of health care value solutions and enhanced clinical programs.

The percentage of knee replacements performed on people 45 to 64 increased from 30 percent in 2000 to 40 percent in 2015, according to the Agency for Healthcare Research and Quality.

Because the devices can wear out in as little as a few years, a younger person could outlive their knees and require a replacement, Garlich said. But “revision” surgeries are much more complicated procedures, with a higher risk of complications and failure.

“Patients think after they have a knee replacement, they will be competing in the Olympics,” Garlich said.

Danette Lake once planned to undergo knee replacement surgery on her other knee. Today, she’s not sure what to do. She is afraid of being disappointed by a second surgery.

Sometimes, she said, “I think, ‘I might as well just stay in pain.’”

Kaiser Health News, a nonprofit health newsroom whose stories appear in news outlets nationwide, is an editorially independent part of the Kaiser Family Foundation.

Why U.S. Biologic Drugs Are So Expensive

By Sarah Jane Tribble, Kaiser Health News

Europeans have found the secret to making some of the world’s costliest medicines much more affordable, as much as 80 percent cheaper than in the U.S.

Governments in Europe have compelled drugmakers to bend on prices and have thrown open the market for so-called biosimilars, which are cheaper copies of biologic drugs made from living organisms. The brand-name products — ranging from Humira for rheumatoid arthritis to Avastin for cancer — are high-priced drugs that account for 40 percent of U.S. pharmaceutical sales.

European patients can choose from dozens of biosimilars, 50 in all, which have stoked competition and driven prices lower. Europe approved the growth hormone Omnitrope as its first biosimilar in 2006, but the U.S. didn’t follow suit until 2015 with cancer-treatment drug Zarxio. 

Now, the U.S. government stops short of negotiating and drugmakers with brand-name biologics have used a variety of strategies — from special contracting deals to overlapping patents known as “patent thickets”— to block copycat versions of their drugs from entering the U.S. or gaining market share.

As a result, only six biosimilars are available for U.S. consumers.

European countries don’t generally allow price increases after a drug launches and, in some cases, the national health authority requires patients to switch to less expensive biosimilars once the copycat product is proven safe and effective, said Michael Kleinrock, research director for IQVIA Institute for Human Data Science.

From $50 to $1,300 a month

If Susie Christoff, a 59-year-old who suffers from debilitating psoriatic arthritis, lived in Italy, the cost of her preferred medicine would be less than quarter of what it is in the U.S., according to data gathered by GlobalData, a research firm.

Christoff tried a series of expensive biologics before discovering a once-a-month injection of Cosentyx, manufactured by Swiss drugmaker Novartis, worked the best.

Without the medicine, Christoff said, her fingers can swell to the size of sausages.

SUSIE CHRISTOFF (KAISER HEALTH NEWS PHOTO)

“It’s 24/7 constant pain in, like, the ankles and feet,” said Christoff, who lives in Fairfax, Va. “I can’t sleep, [and] I can’t sit still. I cry. I throw pillows. It’s just … awful.”

At first, Christoff’s copay for Cosentyx was just $50 a month. But when a disability led her to switch to a Medicare Advantage plan, her out-of-pocket costs ballooned to nearly $1,300 a month — more than three times her monthly car loan.

Christoff, with the help of her rheumatologist, Dr. Angus Worthing, tried Enbrel, Humira and other drugs before finding Cosentyx, the only drug that provides relief. Christoff’s case is “heartbreaking,” Worthing said.

Novartis declined to respond to questions about Cosentyx’s price. Instead, like other pharmaceutical companies, Novartis says it offers patient assistance programs for those who can’t afford the drug. Christoff said she doesn’t qualify for financial assistance.

Like other biologics, Cosentyx costs thousands of dollars per month. The annual cost of Christoff’s treatment runs about $65,000 in the U.S. In Italy, where competition and price negotiations play a bigger role, it would run about $15,000, according to GlobalData.

In England, Dr. Christopher Griffiths, a lead researcher at the National Institute for Health Research who treats patients with Cosentyx, said the National Health Service would pay about 10,000 pounds, or less than $13,000.

And those drastic price differences are true even though there is no biosimilar version of Cosentyx yet available in Europe, and might not be for years.

The cost of the drug is taking a toll on Christoff. This past summer, her progressive disease made it difficult to enjoy the annual family vacation with her three grown children and their kids in Virginia Beach, Va.

“I can’t get down on the sand to play with my kids without help. I can’t get up without help,” Christoff recalled. “I’m not ready to stop trying. But I’m also not ready to go through my entire retirement fund to walk.”

Unlike Cosentyx, rival drugs — Humira, Enbrel and Remicade — all face biosimilar competition in Europe. Only Remicade has competition from a lower-cost biosimilar in the U.S., and Humira isn’t expected to have a copycat competitor in the U.S. market until 2023. Humira, made by AbbVie, is the world’s top-selling drug.

In late October, Wall Street analyst Ronny Gal at Sanford C. Bernstein & Co. noted that AbbVie agreed to drop Humira’s price by 80 percent in one Nordic country to combat biosimilar competition. During the company’s quarterly conference call, AbbVie chief executive Richard Gonzalez said the drug’s discount was as low as 10 percent and as high as 80 percent across the continent, with the highest discounts in Nordic countries.

“These are markets where it’s ‘winner takes all’ across the entire… category, so includes Remicade and Enbrel as well,” Gonzalez said in November, adding that Nordic countries represent about 4 to 5 percent of overall revenue in AbbVie’s international business.

Concerned about how much biologics cost the U.S. health system and patients, Food and Drug Administration Commissioner Scott Gottlieb announced an “action plan” this summer that included tapping the Federal Trade Commission for help, saying he was “worried” about the biosimilar market.

“The branded drug industry didn’t build its success by being business naive; they are smart competitors,” Gottlieb told an audience full of advocates, industry insiders and researchers at the Washington, D.C.-based Brookings Institution in July. “But that doesn’t mean we need to embrace all of these business tactics or agree with them and think they are appropriate.”  

Rebate Traps

One of these business tactics involves so-called rebate traps, in which financial deals are cut to make sure patients can get only a biologic, not a biosimilar. International drugmaker Pfizer alleged in a September 2017 lawsuit that exclusionary contracts created by Johnson & Johnson prevented use of its biosimilar by health insurers, hospitals and clinics.

Johnson & Johnson’s wildly successful biologic Remicade, the brand-name version of infliximab, produced $6.3 billion in worldwide in 2017. Pfizer launched its copycat drug, Inflectra, in the U.S. in October 2016, noting in the announcement that it would price the drug at a 15 percent discount to Remicade’s wholesale price.

Still, health systems such as Geisinger Health, based in Pennsylvania, say they have had difficulty switching to the less expensive alternative.

“J&J has done a really good job of entrenching themselves in the market,” said Jason Howay, manager of formulary services at Geisinger.

The health system ultimately decided it wanted to switch all adults to Pfizer’s biosimilar, saying it provided the same quality of treatment. But Johnson & Johnson had “bundled” the prices of other drugs with Remicade. So if Geisinger stopped using Remicade on adult patients, J&J could stop providing discounts on other drugs, such as those used for cardiology, Howay explained. “It weaves a very tangled web.”

A spokeswoman for Janssen, Johnson & Johnson’s main pharmaceutical subsidiary, says the drugmaker does offer “more attractive contract terms” to buyers who use a wider range of J&J medicines. “Our contracting approach has always prioritized access for patients and their providers,” Meredith Sharp says.

Geisinger negotiated with biosimilar maker Pfizer and won still lower prices to make up for lost savings on the other J&J drugs. It’s now transitioning all adult patients to the less expensive biosimilar.

Kaiser Health News, a nonprofit health newsroom whose stories appear in news outlets nationwide, is an editorially independent part of the Kaiser Family Foundation.

Gene Therapy Eases Chronic Pain in Dogs

By Lisa Marshall, University of Colorado at Boulder

When Shane the therapy dog was hit by a Jeep, life changed for him and his guardian, Taryn Sargent.

The impact tore through the cartilage of Shane's left shoulder. Arthritis and scar tissue set in. Despite surgery, acupuncture and several medications, he transformed from a vibrant border collie who kept watch over Sargent on long walks to a fragile pet who needed extensive care.

"Sometimes he would just stop walking and I'd have to carry him home," recalls Sargent, who has epilepsy and relies on her walks with Shane to help keep her seizures under control. "It was a struggle to see him in that much pain."

Today, 10-year-old Shane's pain and reliance on medication have been dramatically reduced and he's bounding around like a puppy again, 18 months after receiving a single shot of an experimental gene-therapy invented by CU Boulder neuroscientist Linda Watkins

shane and taryn sargent (casey cass/cu boulder)

Thus far, the opioid-free, long-lasting immune modulator known as XT-150 has been tested in more than 40 Colorado dogs with impressive results and no adverse effects. With human clinical trials now underway in Australia and California, Watkins is hopeful the treatment could someday play a role in addressing the nation's chronic pain epidemic.

"I'm hoping the impact on pets, their guardians and people with chronic pain could be significant," said Watkins, who has worked more than 30 years to bring her idea to fruition. "It's been a long time coming."

The Role of Glial Cells

Watkins' journey began in the 1980s when, as a new hire in the department of psychology and neuroscience, she began to rock the boat in the field of pain research.

Conventional wisdom held that neurons were the key messengers for pain, so most medications targeted them. But Watkins proposed that then-little-understood cells called "glial cells" might be a culprit in chronic pain. Glial cells are immune cells in the brain and spinal cord that make people ache when they're sick. Most of the time, that function protects us. 

Watkins proposed that in the case of chronic pain, which can sometimes persist long after the initial injury has healed, that ancient survival circuitry somehow gets stuck in overdrive. She was greeted with skepticism.

"The whole field was like 'what on Earth is she talking about?'"

She and her students hunkered down in the lab nonetheless, ultimately discovering that activated glial cells produce specific inflammatory compounds which drive pain. They also learned that, after the initial sickness or injury fades, the cells typically produce a compound called Interleukin 10 (IL-10) to dampen the process they started.

"IL-10 is Mother Nature's anti-inflammatory," she explains. "But in the onslaught of multiple inflammatory compounds in chronic pain, IL-10's dampening cannot keep pace."

Over the years, she and her team experimented with a host of different strategies to boost IL-10. They persisted and, in 2009, Watkins co-founded Xalud Therapeutics. Their flagship technology is an injection, either into the fluid-filled space around the spinal cord or the site of an inflamed joint, that delivers circles of DNA in a sugar/saline solution to cells, instructing them to ramp up IL-10 production.

With financial help from the National Institute of Neurological Disorders and Stroke, the MayDay Fund and CU's Technology Transfer Office – which has provided intellectual property support, assistance with licensing agreements, and help obtaining a $100,000 research grant in 2018 – Watkins is edging closer to bringing her idea to clinical practice.

She has teamed up with veterinary chronic pain specialist Rob Landry, owner of the Colorado Center for Animal Pain Management in Westminster, to launch the IL-10 research study in dogs.

Their results have not been published yet. But thus far, the researchers say, the results look highly promising.

"They're happier, more engaged, more active and they're playing again," said Landry, as he knelt down to scratch Shane's belly after giving him a clean bill of health.

With Shane able to accompany her on her walks again, Sargent has also seen her quality of life improve. Her seizures, which increased in frequency when Shane was injured, have subsided again.

linda watkins with shane (casey cass/cu boulder)

Human Studies Underway

Because the treatment is so localized and prompts the body's own pain-killing response, it lacks the myriad side effects associated with opioids – including constipation and dependency – and it can last for many months after a single injection.

Ultimately, that could make it an attractive option for people with neuropathic pain or arthritis, Watkins says.

This summer, Xalud Therapeutics launched the first human study in Australia, to test the safety, tolerability and efficacy of the compound. Another one-year clinical trial of 32 patients with osteoarthritis of the knee is now underway in Napa, California.

More research is necessary in both pets and people, Watkins stresses. But she's hopeful.

"If all goes well, this could be a game-changer."

New Drug Reduces Rheumatoid Arthritis Pain

By Pat Anson, PNN Editor

Patients with moderate to severe rheumatoid arthritis (RA) may soon have a new treatment option.

Abbvie has announced positive results from a Phase 3 clinical study of its investigational drug upadacitinib and said it would file for FDA approval later this year.

Patients taking daily doses of upadacitinib for 14 weeks showed significant improvements in physical function, quality of life, pain and morning joint stiffness when compared with patients taking methotrexate, a standard first line treatment for RA.

Patients using upadacitinib reported reductions in pain and morning stiffness and better physical function as early as two weeks after starting treatment.

The results were announced at the annual meeting of the American College of Rheumatology (ACR) in Chicago.

"Upadacitinib as a monotherapy showed significant improvements in rheumatoid arthritis patients' ability to perform daily activities and overall health-related quality of life," said Marek Honczarenko, MD, vice president of global immunology development at AbbVie. "These results show that the improvements in clinical symptoms are accompanied by improvement in outcomes important to patients. These results reinforce upadacitinib's therapeutic potential across diverse rheumatoid arthritis patient populations and its use as a monotherapy treatment option."

Upadacitinib belongs to a class of medication known as JAK inhibitors, which block enzymes that cause inflammation.  The drug is also being investigated as a treatment for psoriatic arthritis, Crohn's disease, ulcerative colitis, ankylosing spondylitis and atopic dermatitis.

RA is a chronic autoimmune disease in which the body’s own defenses attack joint tissues, causing swelling, inflammation and bone erosion. Because RA is incurable, treatments focus on suppressing the immune system to reduce inflammation and slow progression of the disease.

Many RA patients do not respond to or cannot tolerate methotrexate, a drug that was first used in chemotherapy because of its ability to stop the growth and spread of tumors. Because it also acts as an immune system inhibitor, low doses of methotrexate became a first line therapy for rheumatoid arthritis in the 1950’s.

Until the late 1990s, one in three RA patients were permanently disabled within five years of disease onset. There has been significant improvement in RA treatment for many patients who receive biologic disease modifying drugs such as Enbrel and Humira. The cost of biologic drugs can be as much as $25,000 a year and many patients can’t afford them or have insurers unwilling to pay for them.

Supplements Often Tainted by Hidden Drugs

By Pat Anson, PNN Editor

Hundreds of dietary supplements – including some marketed to relieve joint and muscle pain – are tainted with pharmaceutical drugs, according to a new study published in JAMA Network Open.  

Researchers with the California Department of Public Health looked at 746 supplements that the Food and Drug Administration found to be adulterated from 2007 to 2016. About half of the supplements remained on the market, even after the FDA found they contained potentially harmful drugs.

"The FDA didn't even bother to recall more than half of the potentially hazardous supplements," Pieter Cohen, MD, a Harvard Medical School professor told NPR. "How could it be that our premier public health agency spends the time and money to detect these hidden ingredients and then doesn't take the next obvious step, which is to ensure that they are removed from the marketplace?"

Over half of American adults take dietary supplements that contain minerals, vitamins, herbs, fish oil and other “natural” substances.  Most of the adulterated supplements were marketed for sexual enhancement, weight loss or muscle building.

Of the 14 supplements that were promoted as treatments for arthritis, muscle and joint pain, osteoporosis or other painful conditions, half contained diclofenac, a nonsteroidal anti-inflammatory drug (NSAID) and five contained dexamethasone, a steroid used to treat inflammation.

One supplement promoted as a treatment for arthritis – Pro ArthMax -- was found to contain four different NSAIDs, as well as a muscle relaxant and a non-narcotic pain reliever that was never approved for use in the United States. The manufacturer of Pro ArthMax voluntarily recalled the supplement in 2014 after being warned by the FDA.   

Cohen chided the agency for relying on voluntary recalls to get tainted supplements off the market and accused the FDA of “dereliction of duty” in a JAMA commentary. He called on Congress to change the federal law that exempts the $35 billion dollar supplement industry from pre-market safety and clinical studies that are required for pharmaceutical drugs.   

“More than FDA action will be required to ensure that all adulterated supplements are effectively and swiftly removed from the market,” Cohen wrote. “The process that the FDA is required to follow to remove supplements from the marketplace (is) cumbersome and time-consuming; nevertheless, the agency’s failure to aggressively use all available tools to remove pharmaceutically adulterated supplements from commerce leaves consumers’ health at risk.”

Dietary supplements that are tainted with hidden drugs may interact with other medications and raise the risk of adverse events, particularly when consumers already may be using NSAID-containing products.  

Many Invasive Surgeries No Better Than Placebo

By Pat Anson, PNN Editor

In an age when doctors are urged not to prescribe opioids, many patients are being told to have surgery or other invasive procedures to treat their chronic pain.

But a systematic review of 25 clinical trials found little evidence that invasive surgeries are more effective than placebo or sham procedures in reducing low back and knee pain. The study was published in the journal Pain Medicine.

"Our findings raise several questions for clinicians, researchers, and policy-makers. First, can we justify widespread use of these procedures without rigorous testing?" said lead author Wayne Jonas, MD, a Professor of Family Medicine at Georgetown University School of Medicine.

“Given their high cost and safety concerns, more rigorous studies are required before invasive procedures are routinely used for patients with chronic pain.”

The invasive procedures that were analyzed include arthroscopic, endoscopic and laparoscopic surgeries, as well as radiofrequency ablations, laser treatments and other interventions.

In each study, researchers also performed sham or placebo procedures on a control group where they faked the invasive procedure. Patients did not know which intervention (real or sham) they received. Researchers then compared the patients’ pain intensity, disability, health-related quality of life, use of medication, adverse events, and other factors.

They found that reduction in disability did not differ between the two groups three months after the procedures or at six months. Seven of the studies on low back pain and three on knee osteoarthritis showed no difference in pain intensity at six months compared with the sham procedures.

“There is little evidence for the specific efficacy beyond sham for invasive procedures in chronic pain. A moderate amount of evidence does not support the use of invasive procedures as compared with sham procedures for patients with chronic back or knee pain,” said Jonas.

Invasive treatments are being increasingly used as an alternative to opioids. Americans spent an estimated $45 billion on surgery for chronic low back pain and $41 billion on arthroplasty for knee pain in 2014.

Several previous studies have also questioned the value of arthroplasty. Over 850,000 arthroscopic surgeries are performed every year to relieve knee pain in the UK and the United States. But a 2015 study published in the BMJ questioned the evidence behind the surgery and said it provides only “small inconsequential benefit.”

Positive Results for New Osteoarthritis Drug

By Pat Anson, Editor

Two pharmaceutical companies have announced positive results from a Phase 3 study of an experimental non-opioid pain reliever that has a history of safety concerns.

Teva and Regeneron are jointly developing fasinumab as a treatment for chronic pain from osteoarthritis of the knee and hip. The companies say patients treated for 16 weeks with fasinumab injections had significantly less pain and improved function compared to a placebo.

"We are encouraged by these data and look forward to advancing our pivotal Phase 3 fasinumab program in patients with osteoarthritis of the knee or hip, who currently have very limited therapeutic choices to treat their chronic pain, other than with non-steriodal anti-inflammatory drugs or opioids," said George Yancopoulos, MD, President and Chief Scientific Officer of Regeneron.

Fasinumab is a humanized antibody that targets nerve growth factor (NGF), a protein that increases in the body because of injury, inflammation or chronic pain. Fasinumab binds to NGF and inhibits pain signals from muscles, skin and organs from reaching the brain.

Teva and Regeneron say fasinumab was “generally well tolerated” in the Phase 3 study, with similar adverse events (AEs) as in previous trials. Treatment was discontinued due to AEs in 6 percent of the fasinumab patients, about the same as the placebo group. The companies plan to present further details at an upcoming medical conference.

Regeneron recently halted high-dose trials of fasinumab because the risk of harm outweighed the benefits of the drug. There is some concern that NGF antibodies work too well and encourage osteoarthritis patients to become more active, which accelerates joint deterioration. No cases of joint damage were observed in the current study.

Regeneron and Teva are currently enrolling osteoarthritis patients in three additional Phase 3 clinical trials, including one assessing the long-term safety of fasinumab and two trials comparing fasinumab to standard pain therapies.

There is intense competition about drug companies to develop non-opioid pain relievers that don’t have the risk of addiction and overdose. Pfizer and Eli Lilly are jointly developing a similar NGF inhibitor called tanezumab, which was given fast track designation by the FDA in 2017 to speed its development.

Like fasinumab, there are safety concerns about tanezumab. The FDA ordered a partial halt to clinical studies of tanezumab in 2010 after Pfizer said a small number of osteoarthritis patients taking the drug needed joint replacements. Another safety issue arose in 2012 because the drug caused “adverse changes in the sympathetic nervous system of mature animals.”  Most clinical studies of tanezumab did not resume until 2015.

Positive Findings for New Osteoarthritis Drug

By Pat Anson, Editor

Pfizer and Eli Lilly have announced positive findings in treating osteoarthritis pain with an experimental non-opioid drug that has a history of safety concerns.  

Tanezumab is a humanized monoclonal antibody that targets nerve growth factor (NGF), a protein that increases in the body because of injury, inflammation or chronic pain. Tanezumab binds to NGF and inhibits pain signals from muscles, skin and organs from reaching the brain.

In the 16-week clinical study, osteoarthritis patients who were given two injections of tanezumab had significant improvement in their pain, physical function and assessment of their symptoms compared to a placebo. Osteoarthritis is a joint disorder that leads to thinning of cartilage and progressive joint damage.

“There is a substantial need for innovative new treatment options for osteoarthritis, as many patients are unable to find relief with currently available medicines and continue to suffer,” Ken Verburg of Pfizer Global Product Development said in a statement.

“We are encouraged by these results, which speak to the potential of tanezumab as a non-opioid treatment option for pain reduction and improvement in physical function.”

Preliminary safety data showed that tanezumab was generally well tolerated, with about 1% of patients discontinuing treatment due to adverse events. Rapidly progressive osteoarthritis was observed in about 1.5% tanezumab-treated patients, but none in the placebo arm.

The U.S. Food and Drug Administration granted “fast track” designation to tanezumab last year to help speed its development as a new treatment for osteoarthritis and chronic low back pain.

Ironically, it was the FDA that slowed the development of NGF inhibitors in 2010 after Pfizer reported some osteoarthritis patients receiving tanezumab experienced worsening of their disease and needed joint replacements. Another safety issue arose in 2012 because the drug caused “adverse changes in the sympathetic nervous system of mature animals.”  Most clinical studies of tanezumab did not resume until 2015.

“We look forward to continuing to advance tanezumab in our ongoing global Phase 3 development program, which includes six studies in approximately 7,000 patients with osteoarthritis, chronic low back pain and cancer pain,” said Christi Shaw, senior vice president of Eli Lilly. In studies to date, tanezumab has not demonstrated a risk of addiction, misuse or dependence.

Regeneron recently halted high-dose trials of fasinumab, another NGF inhibitor, because the risk of harm outweighed the benefits of the drug. There is some concern that NGF antibodies work too well and encourage osteoarthritis patients to become more active, which accelerates joint deterioration.

Can a Junk Food Diet Cause Osteoarthritis?

By Steve Weakley

Does what’s in your gut influence the pain in your knees? New research on mice at the University of Rochester Medical School suggests that it might, but the results are far from conclusive.

Researchers fed one group of laboratory mice a high fat diet that included red meat and milkshakes, and another group of mice a healthier low-fat diet. Both groups of mice had their knees surgically damaged to mimic the effects of osteoarthritis -- “wear and tear” arthritis that is often associated with age, obesity or injury.

Twelve weeks of the high fat diet made the mice obese and diabetic and led to more seriously damaged joints. It also created an imbalance of harmful bacteria in their digestive tracts. 

One group of the fat mice were then given a supplement containing the prebiotic fiber oligofructose (also available as an over-the-counter probiotic).  The researchers said the supplement did not cause the mice to lose weight, but it did greatly improve their blood sugar levels and the balance of healthy bacteria in their gut.  More importantly, the study concludes, the mice that were given the supplement also had healthier joints than the control group.

The University of Rochester study concluded that prebiotics and the correction of gut bacteria might help protect against osteoarthritis caused by obesity. And one of the researchers, Dr. Robert Mooney, told Forbes that the study suggests osteoarthritis may be accelerated or even caused by inflammation.

"That reinforces the idea that osteoarthritis is another secondary complication of obesity--just like diabetes, heart disease, and stroke, which all have inflammation as part of their cause," said Mooney. "Perhaps, they all share a similar root, and the microbiome (digestive bacteria) might be that common root."

However a critique by Britain’s National Health Service (NHS) said that conclusion might be premature.

“It's presumptuous to conclude that an imbalance of gut bacteria could be directly linked to risk of osteoarthritis in humans from the results of a study in mice with artificially induced knee damage. As such, there's no compelling evidence that prebiotics would prevent or reverse osteoarthritis,” the NHS said.

“Aiming for a healthy weight through a good diet combined with physical activity is a better strategy for reducing the risk of osteoarthritis (as well as many other long-term conditions) than taking prebiotics to try to combat the effects of a poor diet. “

Osteoarthritis is a joint disorder that leads to progressive joint damage. It can affect any joint in the body but is most commonly felt in weight bearing joints such as the knees and hips. Nearly 40 percent of Americans over the age of 45 have some degree of knee osteoarthritis.

Previous studies have also found a link between a high fat diet and osteoarthritis.  Australian researchers reported last year that a diet rich in animal fats, butter and palm oil weakens cartilage and produces osteoarthritis-like changes in the knee.

"We also found changes in the bone under the cartilage on a diet rich in saturated fat," said Professor Yin Xiao of Queensland University of Technology’s Institute of Health and Biomedical Innovation. "Our findings suggest that it's not wear and tear but diet that has a lot to do with the onset of osteoarthritis.”

The University of Rochester researchers hope to include humans in future studies on the effects of diet on osteoarthritis.

What the JAMA Opioid Study Didn’t Find

By Roger Chriss, Columnist

A recent opioid study published in the Journal Of the American Medical Association (JAMA)  evaluated pain management in patients with hip and knee osteoarthritis and low back pain.

The study by VA researcher Erin Krebs, MD, and colleagues found that “treatment with opioids was not superior to treatment with nonopioid medications for improving pain-related function over 12 months.”  

That finding was widely and erroneously reported in the news media as meaning that opioids are ineffective for all types of chronic pain.

But the most fascinating result of the study – the one not being reported -- is what wasn’t found. The 108 people in the study who took opioids for a year did not develop signs of opioid misuse, abuse or addiction, and did not develop opioid-induced hyperalgesia – a heightened sensitivity to pain.

And no one died of an overdose.

This is significant because it runs counter to commonly held beliefs in the medical profession about the risks of prescription opioids. Here are a few recent examples:

“Opioids are very addictive and their effectiveness wanes as people habituate to the medication,” Carl Noe, MD, director of a pain clinic at the University of Texas Medical Center wrote in an op/ed in The Texas Tribune.

Don Teater, MD, a family physician in North Carolina, also believes that people on long-term opioid therapy experience dose escalation, which leads to hyperalgesia. “Opioids cause permanent brain changes,” Teater told USA Today.

Krebs herself has made similar comments. "Within a few weeks or months of taking an opioid on a daily basis, your body gets used to that level of opioid, and you need more and more to get the same level of effect,” she told NPR.

But the Krebs study didn’t see any of that happen.

Krebs and colleagues closely monitored the 108 people in the opioid arm of the study, using “multiple approaches to evaluate for potential misuse, including medical record surveillance for evidence of ‘doctor-shopping’ (seeking medication from multiple physicians), diversion, substance use disorder, or death.” They also had participants complete the “Addiction Behavior Checklist” and assessed their alcohol and drug use with surveys and screening tools.

What did Krebs find in the opioid group after 12 months of treatment?

“No deaths, ‘doctor-shopping,’ diversion, or opioid use disorder diagnoses were detected,” she reported. “There were no significant differences in adverse outcomes or potential misuse measures.”

Health-related quality of life and mental health in the opioid group did not significantly differ from the non-opioid group – and their anxiety levels actually improved.  

These are observational findings in the study. They were not a part of what Krebs and colleagues were specifically trying to measure. As the study notes: “This trial did not have sufficient statistical power to estimate rates of death, opioid use disorder, or other serious harms associated with prescribed opioids.”

ERIN KREBS, MD

But they are valuable observations. They note what didn’t happen in the study. Over 100 people were put on opioid therapy for a year, and none of them showed any signs of dose escalation or opioid-induced hyperalgesia, or any evidence of opioid misuse, abuse or addiction.

Krebs told the Minneapolis Star Tribune that this “could reflect the fact that the study did not enroll patients with addiction histories, and because the VA provided close supervision to all participants during the yearlong study.”

In other words, Krebs and colleagues used an opioid prescribing protocol that achieved an admirable level of patient safety. Their approach is similar to what many pain management practices currently pursue and what the CDC and various state guidelines recommend: Risk assessment before initial prescribing and careful monitoring over time.

The Krebs study provides rare and detailed observations of what happens when people are put on long-term opioid therapy. A lot of what is claimed about dose escalation, opioid-induced hyperalgesia, and misuse or abuse didn't happen at all.

This outcome demonstrates that long-term opioid therapy can be safe and effective, and may be useful in treating other chronic conditions, from intractable neuropathies to painful genetic disorders. That’s worth reporting too, isn’t it?

Roger Chriss lives with Ehlers Danlos syndrome and is a proud member of the Ehlers-Danlos Society. Roger is a technical consultant in Washington state, where he specializes in mathematics and research.

The information in this column should not be considered as professional medical advice, diagnosis or treatment. It is for informational purposes only and represents the author’s opinions alone. It does not inherently express or reflect the views, opinions and/or positions of Pain News Network.

Is JAMA Opioid Study Based on Junk Science?

By Pat Anson, Editor

You may have read about a research study published this week in the Journal of the American Medical Association (JAMA), which compared the effectiveness of opioid and non-opioid medications in treating chronic pain. 

The yearlong study of 240 patients found that opioids were not superior to pain relievers like acetaminophen and ibuprofen in treating chronic back pain or hip and knee pain caused by osteoarthritis.  Pain improved for 41% of the patients who took opioids, compared to 54% in the non-opioid group.  

It’s an interesting study – one of the few to look at the effectiveness of any pain relievers long term – but some critics are questioning the study’s methodology and the alleged anti-opioid bias of its lead author, Erin Krebs, MD, a researcher for the Department of Veterans Affairs.

First let’s look at some of the news coverage the study is getting.

“Opioids Don’t Treat Chronic Pain Any Better Than Ibuprofen” reads the headline in Newsweek, an article that never mentions the JAMA study was limited to patients with back pain or osteoarthritis.

“Opioids Don’t Beat Other Medications for Chronic Pain” was the headline in NPR.com, while the Chicago Tribune went with “Opioids no better than common painkillers for treating chronic pain.”

The Tribune article included a quote from one of the co-authors of the CDC opioid guidelines. "The fact that opioids did worse is really pretty astounding," said Roger Chou, MD. "It calls into question our beliefs about the benefits of opioids."

Notice the news coverage strongly suggests that opioids are ineffective for all types of chronic pain – not just back pain and osteoarthritis.  Patients living with chronic pain from arachnoiditis, trigeminal neuralgia or some other intractable pain condition would probably disagree about that. And they'd find the idea of taking ibuprofen laughable, if not infuriating. But no one asked for their opinion.

Also unmentioned is that opioids are usually not prescribed for osteoarthritis or simple back pain, which are often treated with NSAIDs and over-the-counter pain relievers.

So, what JAMA has published is a government funded study designed to look at a treatment (opioids) that most people with back pain and arthritis never actually get.

“You've been had by anti-opioid advocates disguising their advocacy as science.  Krebs is well known in professional circles for this kind of distorted advocacy junk science,” wrote patient advocate Red Lawhern, PhD, in a comment submitted to the Philadelphia Inquirer after it published a misleading headline of its own, “Prescription opioids fail rigorous new test for chronic pain.”

“I suggest that you retract your article.  In its present form, it is propaganda not fact,” said Lawhern, a co-founder of the Alliance for the Treatment of Intractable Pain (ATIP). “Opioids have never been the first-line medical treatment of choice in lower back pain or arthritis. That role is served by anti-inflammatory meds, some of them in the prescription cortico-steroid family.  NSAIDs have a role to play, recognizing that they are actively dangerous in many patients if taken at high doses for long periods.  Hundreds of people die every year of cardiac arrest or liver toxicity due to high-dose acetaminophen or ibuprofen.” 

Who is Erin Krebs?  

Dr. Krebs is an associate professor at the University of Minnesota Medical School and a prolific researcher at the VA Medical Center in Minneapolis.

She was also an original member of the “Core Expert Group” – an advisory panel that secretly drafted the CDC’s controversial opioid guidelines while getting a good deal of input from the anti-opioid activist group Physicians for Responsible Opioid Prescribing (PROP). The guidelines recommend that opioids not be prescribed for chronic pain.

Krebs also appeared in a lecture series on opioid prescribing that was funded by the Steve Rummler Hope Foundation, which coincidentally is the fiscal sponsor of PROP. 

Some of her previous opioid research has been controversial. In a study published last year in the Annals of Internal Medicine, Krebs reviewed 67 studies on the safety and effectiveness of opioid tapering. Most of the studies were of poor quality, but nevertheless Krebs came to the conclusion that pain levels and the quality of life of patients “may improve during and after opioid dose reduction.”

ERIN KREBS, MD

“This review found insufficient evidence on adverse events related to opioid tapering, such as accidental overdose if patients resume use of high-dose opioids or switch to illicit opioid sources or onset of suicidality or other mental health symptoms,” wrote Krebs.

PROP founder Andrew Kolodny, MD, read the review and liked it, tweeting that “dangerously high doses should be reduced even if patient refuses.”

But forced opioid tapering is never a good idea, according to a top CDC official.

“Neither (Kreb’s) review nor CDC's guideline provides support for involuntary or precipitous tapering. Such practice could be associated with withdrawal symptoms, damage to the clinician–patient relationship, and patients obtaining opioids from other sources,” wrote Deborah Dowell, MD, a CDC Senior Medical Advisor, in an editorial also published in the Annals of Internal Medicine. 

As for Krebs’ contention that there is “insufficient evidence” of adverse events associated with opioid tapering, that notion may be put to rest next month when the VA releases a new study showing that tapering has led to a growing number of suicides by veterans.

In a summary of the findings, which will be presented at the Rx Drug Abuse & Heroin Summit, VA researchers report that “opioid discontinuation was not associated with overdose mortality, but was associated with increased suicide mortality.”  

Who and what should we believe in the neverending debate about opioids? PNN columnist Roger Chriss wrote about Krebs’ opioids vs. non-opioids study last year, when the initial reports of its findings came out. Roger said prescribing decisions are best left to physicians who know their patients’ medical conditions – not researchers, regulators or the news media.

“In reality, there is no ‘versus’ here. Opioids and NSAIDs are both valuable tools for chronic pain management. To pretend that one is inherently better than the other is to miss the essential point: Both work and should be available for use as medically appropriate,” Roger wrote. 

Osteoarthritis Drug Works No Better Than Placebo

By Pat Anson, Editor

Hydroxychloroquine (Plaquenil) is a medication commonly used to treat rheumatoid arthritis, lupus and other autoimmune diseases. It’s also being prescribed off-label to treat inflammation and pain caused by hand osteoarthritis, a joint condition that affects nearly a third of patients over the age of 70.

But in a new study published in the Annals of Internal Medicine, British researchers reported that hydroxychloroquine is no more effective than a placebo in relieving moderate to severe pain caused by hand osteoarthritis.

Researchers at the Leeds Institute of Rheumatic and Musculoskeletal Medicine and the Leeds Biomedical Research Centre randomly assigned 248 patients with radiographic hand osteoarthritis to either hydroxychloroquine (200 to 400 mg) or placebo for a year.

Most of the patients had symptoms of hand osteoarthritis for about 5 years, and their average pain level was 7 out of 10.

After 3, 6 and 12 months, there were no significant differences in treatment outcomes between the hydroxychloroquine and placebo groups.

“We found that HCQ (hydroxychloroquine) was not a more effective analgesic than placebo when added to usual care in persons with moderate to severe hand osteoarthritis,” researchers reported. “Background analgesic use did not differ between groups, and baseline inflammation and structural damage did not affect response to HCQ. The study therefore presents no evidence that HCQ should be considered within the management plan of patients with hand osteoarthritis.”

Two doctors who reviewed the study say more research is needed to find drugs that can treat the inflammation caused by hand osteoarthritis, a condition for which there are no effective therapies.

“The negative findings in this carefully done trial beg the question of what went awry. Did HCQ fail to reduce inflammation, or did reduced inflammation not translate to pain relief?” wrote Elena Losina, PhD, and Jefferey Katz, MD in an editorial.

“Although HCQ is safe, it is also a weak anti-inflammatory agent seldom used in contemporary practice as a solo disease-modifying therapy for rheumatoid arthritis and other inflammatory conditions. Further therapeutic studies of the effects of anti-inflammatory therapy on nodal hand osteoarthritis will need to use more potent agents or compounds developed to more specifically target the inflammatory pathways documented in this condition.”

Why Does Menopause Worsen Rheumatoid Arthritis?

By Pat Anson, Editor

A large new study is confirming what many women with rheumatoid arthritis (RA) already know – menopause and hormonal changes can significantly worsen their pain and other symptoms. But it's not clear why that happens.

Researchers at the University of Nebraska Medical Center enrolled over 8,000 women with RA – both young and old -- in their observational study. They found that post-menopausal women with RA had a significant increase in the level and rate of functional physical decline. Menopause was also associated with a worsening progression of the disease.

RA is a chronic and disabling autoimmune disease in which the body’s own defenses attack joint tissues, causing pain, inflammation and joint erosion. Women experience RA at a rate three times greater than men, have more severe symptoms and increased disability.

Previous studies have shown that women with RA experience changes in their disease during reproductive and hormonal changes. During pregnancy, women are less likely to develop RA, yet the disease is more likely to progress and flare during the post-partum period. Similarly, women who experience early menopause are more likely to develop RA compared to those who experience normal or late menopause.

Hormone levels of estrogen increase during pregnancy and decline during menopause – but the association with RA is not fully understood.

"Further study is needed as to why women with rheumatoid arthritis are suffering a greater decline in function after menopause," said the study's lead author, Elizabeth Mollard, PhD, an assistant professor in the College of Nursing at the University of Nebraska Medical Center.

"Not only is this decline causing suffering for women, it is costly to both individuals and the healthcare system as a whole. Research is specifically needed on the mechanism connecting these variables with the eventual goal of identifying interventions that can maintain or improve function in postmenopausal women with rheumatoid arthritis."

The study is published in the journal Rheumatology.

RA affects about 1.3 million Americans and about one percent of the global population. Until the late 1990s, one in three RA patients were permanently disabled within five years of disease onset.

Although there are still no cures for RA, in recent years there has been significant improvement in treatment, with disease control now possible for many patients who receive biologic drugs. Those treatments are expensive, with some biologic therapies costing $25,000 a year.

Stem Cells: Signs of Progress in a Rigged Game

By A. Rahman Ford, Columnist

The Wall Street Journal recently published an article on the use of stem cell therapies for knee problems, including arthritis.  Overall, the perspective of the piece was positive and it has several laudable aspects.  Physicians from large academic institutions, such as Harvard University and Stanford University, were interviewed to provide their opinions on the use of autologous stem cells derived from a patient’s own fat or bone marrow for certain painful orthopedic indications. 

The article rightly acknowledges the high patient demand for these autologous therapies. It also mentions how the U.S. lags behind other countries in offering them and the disturbing fact that this therapy is not covered by medical insurance.  The doctors who were interviewed also discussed how conventional approaches to osteoarthritis in knees – meniscus surgery, microfracture surgery, etc. – often fail to demonstrate long-term benefit.  These doctors, along with many others around the world, recognize that we need new therapies for orthopedic conditions.

Any positive portrayal of the clinical uses of stem cells should be welcomed. The unfortunate truth is that many potential patients are scared off by publications that focus their reporting on the alleged malfeasance of a few bad-actor stem cell clinics.  These same publications often neglect to cover the countless stem cell success stories from clinics in the U.S. and abroad. 

A focus on these promising results may help allay those fears and convince some of those fearful patients that stem cells are, in fact, a viable medical option for their chronic orthopedic pain. 

Less fear can lead to self-education and increased awareness of the safety and potential of stem cells.  Patients may even try stem cell therapy and become advocates.  In this sense, the WSJ piece is good public relations for stem cell therapies overall.

However, there is an unsettling undertone in the WSJ piece and media coverage in general of stem cells, which places too much emphasis on the opinions of clinicians from certain large institutions.  That diminishes the value of work being done in smaller stem cell clinics, which have been safely and effectively treating patients with orthopedic conditions for years. 

The unintended implication is that Harvard and Stanford physicians’ assessments are more legitimate because of the perceived prestige of their employers, and because they follow the guidelines that the FDA set forth for pursuing such treatments.  Of course, these institutions have millions of dollars in capital that it takes to conduct clinical studies and comply with these guidelines, while smaller clinics often do not.  We must take care to avoid creating or reinforcing illegitimate hierarchies that give some physicians more scientific authority than others, based solely on money, perceived prestige, or the ability to adhere to an unfair set of rules.

The sad truth is that the stem cell game is rigged.  The FDA’s rules regarding the use of autologous stem cell therapies favor those with more financial resources because they can afford expensive clinical trials.  Medical innovation cannot be strictly the domain of wealthy institutions with the finances to play on a tilted field.  The FDA’s “minimal manipulation” and “homologous use” regulatory standards for using stem cells are unduly burdensome and need to be relaxed for autologous stem cell uses. 

Recently, the FDA issued a warning letter to American Cryostem, a company involved in the manufacture of adipose stem cell products derived from a patient’s body fat.  In addition to manufacturing violations, the company was accused of violating the FDA’s “minimal manipulation” and “homologous use” standards. 

Setting the merits of the case aside, it is emblematic of the FDA’s crackdown on clinics that are much smaller than Harvard and Stanford, but which have been relieving patients’ pain with autologous therapies for years.  Their scientific contributions must not be subordinated or dismissed as illegitimate or inconsequential.

Stories of how stem cells are entering mainstream medicine can help us realize the goal of available, affordable stem cell therapy for all Americans.  However, valorization of those institutions with the means to “play within the rules” must not come at the expense of sounding the alarm that the rules themselves are patently unfair.

A. Rahman Ford, PhD, is a lawyer and research professional. He is a graduate of Rutgers University and the Howard University School of Law, where he served as Editor-in-Chief of the Howard Law Journal. He earned his PhD at the University of Pennsylvania.

Rahman lives with chronic inflammation in his digestive tract and is unable to eat solid food. He has received stem cell treatment in China.  

The information in this column should not be considered as professional medical advice, diagnosis or treatment. It is for informational purposes only and represent the author’s opinions alone. It does not inherently express or reflect the views, opinions and/or positions of Pain News Network.

Legal Battles Brew Over High Cost of Arthritis Drugs

By Julie Appleby, Kaiser Health News

Early last winter, Pfizer launched its new rheumatoid arthritis treatment, Inflectra, pricing it 15 percent below the $4,000-a-dose wholesale price of Remicade, the drug for which it is a close copy.

Pfizer figured its lower price would attract cost-conscious insurers.

A year later, though, its drug has barely scratched the market and Pfizer has filed an antitrust suit against its rivals, alleging they are thwarting lower-priced competition through “exclusionary contracts” and rebates.

The outcome of the case — filed in September in U.S. District Court against Johnson & Johnson, the maker of Remicade, and Janssen Biotech — could affect the future of biosimilars, a new class of drugs. Some policy experts say these near-copies of biologics are key to slowing spending on complex and expensive specialty medications like those used to treat rheumatoid arthritis.

At the heart of the case are rebates, which are discounts off the wholesale price of drugs.

Manufacturers offer them to help keep their products on insurers’ lists of covered drugs. The money mainly goes back to insurers and pharmacy benefit managers, who say the rebates help reduce health care spending.

But Pfizer alleges that those rebates are being used to thwart biosimilars’ entry into the marketplace.

“This is the first antitrust case we’ve seen like this around biosimilars,” said Michael Carrier, a Rutgers Law School professor “Pfizer is claiming that one form of anti-competitive behavior involves withholding rebates from insurers.”

Biosimilars are costly to produce, so they are not likely to trigger the same sharp pricing drop triggered by generics. Still, their manufacturers say they could bring consumers some relief to rival biologics’ high price tags.

Pfizer’s Inflectra is one of the first biosimilars to hit the market since Congress passed legislation in 2010 to pave the way.

According to Pfizer, weeks after Inflectra gained Food and Drug Admininstration approval, J&J moved to stake out its biologic turf.

J&J began requiring insurers and PBMs to sign “exclusionary contracts … designed to block both insurers from reimbursing and hospitals and clinics from purchasing Inflectra or other biosimilars of Remicade despite their lower pricing,” alleges the case filed in federal district court in Philadelphia.

If insurers don’t agree to the J&J contracts, the loss of rebates could “for some insurers, run into the tens of millions of dollars annually,” the Pfizer case alleges.

Even with its lower price, Pfizer faced an uphill battle to win market share.

Remicade is the fifth-biggest-selling drug by revenue in the U.S., reaping more than $4.8 billion in 2016 for makers J&J and Janssen, the suit said. Often, patients are reluctant to switch once they are established on an RA drug that is working for them.

Still, Pfizer thought it would pick up newly diagnosed patients and gain ground that way. But its lawsuit says the drug accounted for only about 4 percent of total sales, with Remicade getting the rest, by early September.

“We stand by our contracts,” said J&J and Janssen Biotech in a written statement. The firms also defend rebates as “competition that is doing what competition is meant to do: driving deeper discounts that will lead to overall lower costs.”

Yet the price of Remicade has not fallen, the Pfizer case says.

Since approval of Inflectra, J&J has raised the list price of Remicade by close to 9 percent, the lawsuit alleges. As of September, Remicade’s average sales price –after discounts and rebates — is more than 10 percent higher than Inflectra.

“This case is a big deal, because it has the potential to bring to light some of the anti-competitive contracting practices at work to keep … prices extremely high,” said Jaime King, a professor at University of California-Hastings College of the Law.

Kaiser Health News (KHN) is a national health policy news service. It is an editorially independent program of the Henry J. Kaiser Family Foundation which is not affiliated with Kaiser Permanente.