麻豆果冻传媒

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A 麻豆果冻传媒-led research team has identified a common genetic profile that predicts severe, potentially fatal reactions to four powerful immune-suppressing drugs. The genetic profile is found in about 20% of the general population.

The drug reactions, reported in a study in听Annals of the Rheumatic Diseases, were identified in patients with a rare condition called Still鈥檚 disease. The drugs are prescribed for a variety of conditions, and two of the medications have been given for severe COVID-19, raising concern that a large number of patients are at risk.

鈥淲e need caution with the use of these drugs,鈥� said听, a pediatric rheumatologist and allergist at the Stanford University School of Medicine and a lead author of the study. The medications tamp down inflammation and can help reverse a cytokine storm, in which an overabundance of immune signals causes severe inflammation. 鈥淭hese drugs are amazing, except when they鈥檙e not,鈥� Saper said, adding that the research team hopes the FDA will add warning on the label requiring pre-prescription screening for the risky genes.听

Saper shares lead authorship of the study with Michael Ombrello, MD, of the National Institute of Arthritis and Musculoskeletal and Skin Diseases. The study鈥檚 senior authors are听, professor of pediatrics at听麻豆果冻传媒, who initiated the project, and Jill Hollenbach, PhD, of the University of California-San Francisco.

The drugs in question are anakinra, canakinumab and rilonacept, which block the inflammation-provoking immune molecule interleukin-1 (IL-1); and tocilizumab, which blocks the pro-inflammatory immune signal called interleukin-6 (IL-6).

Most doctors do not know the risks these drugs carry, Saper said, adding that a widely available blood test can reveal the risky genetic signature. Identifying at-risk patients is a matter of knowing which lab test to order.

Mysterious new lung problems

When the drugs that block IL-1 and IL-6 were introduced in the early 2010s, they revolutionized treatment for several autoinflammatory conditions, including Still鈥檚 disease, which is characterized by high fevers and severe joint inflammation. (In children, the disease is also called systemic juvenile idiopathic arthritis.) For many patients, the drugs eliminate their symptoms and reduce or even prevent flare-ups.

However, in 2013, a scientific article reported mysterious, life-threatening new lung problems in some Still鈥檚 patients. The Stanford researchers hypothesized that lung infections could be responsible, or that some Still鈥檚 patients might have a genetic profile that caused the lung problems.

For their study, the researchers acquired lung biopsy results and lung CT scans from patients around the world. The team鈥檚 pathologists noted features of an uncommon lung pathology called alveolar proteinosis, in which air spaces in the organ become filled with a protein that normally forms the lung surfactant. (In a healthy lung, a thin layer of surfactant coats the air sacs to help them stay open.) The team鈥檚 radiologists also pointed out that a subset of patients had lung CT scans showing an odd combination of tissue abnormalities and unusual-appearing lymph nodes.

Mellins and Saper looked into the history of patients with both the pathologic and lung CT features and found that they were all taking IL-1 or IL-6 blockers; patients without this combination were not taking the medications. 鈥淲e said, 鈥榃ow, we think it鈥檚 the drugs,鈥欌�� Saper said.

Meanwhile, Mellins extracted human leucocyte antigen (HLA) profiles from the genetic data of 20 lung disease patients and found that more than half shared the same genetic signature. HLAs are the proteins on cell surfaces that distinguish 鈥渟elf鈥� from 鈥渘onself鈥� tissues.

Evidence points to drug reaction

鈥淚 picked up the phone and called Jill Hollenbach, an immunogeneticist at UCSF, and she said, 鈥楾his is remarkable,鈥欌�� Mellins said. Hollenbach thought that the results indicated a severe drug reaction rather than a genetically linked feature of Still鈥檚 disease.

The researchers realized that patients with the lung problems met criteria for drug reaction with eosinophilia and systemic symptoms, or DRESS, a type of severe, delayed medication reaction. Although features of DRESS, easily missed with Still鈥檚 disease, began soon after the drug was started, on average it took 14 months on the drugs for patients鈥� severe lung disease to become apparent.

The researchers compared 66 Still鈥檚 disease patients who had DRESS with 65 patients who did well on the drugs. Among other problems, three-quarters of the patients with DRESS, with or without lung disease, had liver enzyme levels indicating serious liver dysfunction, and 64% developed a cytokine storm.

The reactions were not always recognized by the patients鈥� physicians. Patients who were taken off and kept off the drugs did well. Tragically, of 33 patients who kept taking the medications after their reactions began, nine died.

鈥淭his [drug reaction] is a very, very complicated signal, and it鈥檚 hard for clinicians to realize that stopping the drug is what you do, especially if there is organ involvement, such as lung or liver dysfunction,鈥� Saper said.

The genetic signature that confers higher risk is found in 20% of the population at large and in 80% of patients in the study who had DRESS. Blood testing for HLA markers is available in clinical labs. Since the gene test did not predict all who reacted, this study indicates that physicians should watch carefully for DRESS reactions to inhibitors of IL-1 and IL-6.

COVID-19 concern

Two of the immune-blocking medications, tocilizumab and anakinra, have recently been used in patients experiencing cytokine storms due to severe COVID-19. This worries the research team because the risky HLA markers are quite common. A recent scientific report on 24 very ill COVID-19 patients treated with tocilizumab noted that six patients died. The Stanford researchers suggest caution in using this drug for COVID-19.

鈥淭here鈥檚 all this circumstantial evidence in COVID patients, but it requires more investigation,鈥� Saper said. Meanwhile, the researchers hope the findings will quickly prompt HLA testing of Still鈥檚 patients.

鈥淥ne imperative we have is, 鈥楾he right drug, for the right person, at the right time,鈥欌�� Saper said. 鈥淚n Still鈥檚 disease, for most people these drugs are exactly right. But we鈥檝e been able to identify a simple genetic test that could tell if this is not the right drug for you.鈥�

The paper鈥檚 other Stanford authors are research associate Gonzalo Montero-Martin, PhD; Serena Tan, MD, assistant professor of pathology; postdoctoral scholars Vamsee Mallajosyula, PhD, Debopam Ghosh, PhD, and Jianpeng Xu, PhD; Lu Tian, PhD, professor of biomedical data science; and Marcelo Fernandez-Vina, PhD, professor of pathology.

Tian and Mellins are members of the Stanford Maternal and Child Health Research Institute, Mellins is a member of the Interdisciplinary Program in Immunology and the Wu Tsai Neurosciences Institute at Stanford, and Tian is a member of the Stanford Cardiovascular Institute.

Among the contributors are听other scientists from UCSF and the National Institute of Arthritis and Musculoskeletal and Skin Diseases, as well as scientists from UC-San Diego, Emory University School of Medicine and Children鈥檚 Healthcare of Atlanta, the University of Pittsburgh, the University of Washington, the National Human Genome Research Institute, the University of Pennsylvania, Pennsylvania State University College of Medicine, Yale University Medical School and the University of Hong Kong, also contributed to this research.

The research was funded by the Lucile Packard Foundation for Children鈥檚 Health, the Stanford Maternal and Child Health Research Institute, the National Institute of Arthritis and Musculoskeletal and Skin Diseases (grant Z01-AR041198), the National Human Genome Research Institute (grant Z01-HG200370), the Gordon and Marilyn Macklin Foundation, the RK Mellon Institute for Pediatric Research and the Marcus Foundation Inc.

Some of the authors received personal fees, grants or both from Novartis, which makes canakinumab.

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