MMF Linked to Fewer Flares, Less Nephritis in Early Lupus

Early use of mycophenolate mofetil (MMF), a drug used to dampen the immune system in organ transplant recipients, may reduce the risk for severe flares in patients with newly diagnosed systemic lupus erythematosus (SLE), according to results from a randomized, open-label, observer-blinded clinical trial.

In interviews, two SLE specialists who were not involved with the study said the research is preliminary but promising. However, another specialist criticized the paper’s reliance on unusual doses of prednisone and MMF, saying it “puts people on a treatment regimen that nobody ever uses.”

The Lupus Foundation of America estimates that about 16,000 people in the United States are diagnosed with lupus each year. “Our current treatment paradigm is to go pretty slowly and start treatment for new-onset, mild SLE with glucocorticoids, if necessary, and hydroxychloroquine,” said Karen H. Costenbader, MD, MPH, of Harvard Medical School and Harvard School of Public Health, Boston.

Stronger immunosuppressive agents may be added as patients progress, she said.

Off-label use of MMF, which is approved by the US Food and Drug Administration only for patients with certain organ transplants, may be appropriate in some cases, she said. “There is a big push to start immunosuppressives earlier, but we currently would reserve mycophenolate for those with severe manifestations — lupus nephritis; vasculitis; or lung, brain, or heart inflammation.”

In the trial, adult patients who received oral prednisone (starting at 0.5 mg/kg/day) and hydroxychloroquine sulfate (5 mg/kg/day) plus MMF (500 mg twice daily) for 96 weeks were less likely to develop severe flares than those who took the regimen without MMF (relative risk [RR], 0.39; 95% CI, 0.17-0.87; P = .01). Severe flares occurred in 10.8% of the MMF group (7 of 65 patients) and in 27.7% of the control group (18 of 65), Yijun You, MD, of Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China, and colleagues reported in JAMA Network Open. 

Patients in the MMF group also had 89% lower risk for lupus nephritis than those in the control group (RR, 0.11; 95% CI, 0.01-0.85; P = .008), with kidney involvement occurring in 1.5% (1 of 65) vs 13.8% (9 of 65).

During 2018-2021, researchers recruited 130 patients in China aged 18-65 years with newly diagnosed SLE, a high titer of anti-dsDNA antibodies, and no major organ involvement (mean age, 34.5 years; 86.2% women). Patients’ initial 0.5 mg/kg/day prednisone dose was maintained for 4 weeks, then tapered by 5.0 mg every 2 weeks, and when the dose had been reduced to 20.0 mg/day, it was tapered by 5 mg every month and then gradually to 0.1-0.2 mg/kg/day. If patients had severe flares, they stopped taking MMF. (The study authors did not respond to requests for comment on the study.) 

‘A Treatment Regimen That Nobody Ever Uses’

While Costenbader called the study “very interesting” and said “every person diagnosing or taking care of patients with lupus should be familiar” with it, she noted that the prednisone doses were high. “I am wondering why they used quite so much glucocorticoid for everyone. This may have masked some of the MMF effect and biased toward the null. They also used a low dose of MMF and did not ramp it up as we would normally to a full dose. That being said, it is remarkable that it was well-tolerated and resulted in better outcomes over the period of the trial.”

Daniel J. Wallace, MD, of Cedars-Sinai Medical Center and David Geffen School of Medicine at the University of California, Los Angeles, also highlighted the high doses of prednisone and low doses of MMF. “It’s a useless paper that puts people on a treatment regimen that nobody ever uses,” he said.

The rates of mild to moderate flares were similar between the control and intervention groups (38.5% vs 36.9%, respectively; RR, 0.96; P = .90). This finding is surprising, said Judith A. James, MD, PhD, of the University of Oklahoma Health Sciences Center in Oklahoma City. “It may be that mild flares have a different mechanism or are caused by noninflammatory endotypes that don’t respond to MMF.”

Costenbader noted that a risk-benefit analysis will need to be done to take the risks of MMF into account. “However, every time that a person flares or is not in lupus low-disease activity state, potentially permanent organ damage is done and the patient suffers,” she said. “Preventing lupus nephritis de novo was also seen — nine cases potentially prevented — and that is also really interesting. It would be amazing if we could completely avoid that life-threatening complication.”

MMF can cause miscarriage and boost the risk for birth defects, and the manufacturer says it can lower the effectiveness of birth control pills. It can also boost the risk for some cancers such as lymphoma and increase the risk for infections.

Surprisingly, the number of adverse events in the control and intervention groups were similar (35.4% vs 46.2%, respectively; RR, 1.30; 95% CI, 0.86-1.99; P = .20). They included infection (30.8% vs 33.8%, respectively; P = .70) and gastrointestinal tract events (16.9% for both; P > .99).

“There were overall pretty similar rates of side effects, but maybe this was because MMF dose was pretty low in the treated group, or the glucocorticoid dose was not so low in both groups,” Costenbader said. She also noted that “the risk of malignancy with MMF is longer-term than this study. It may not show up for 5-10 or even more years, but we know it exists. Infections are also increased with MMF — some of which can be avoided with vaccines for Covid, pneumonia, influenza, shingles, etc. MMF also causes gastrointestinal intolerance, and people often are not able to take it because of nausea, vomiting, diarrhea, and elevated liver function tests.”

James said the infection rates “may be due to the higher doses of steroids patients in both groups are on for several months at the beginning of the study.”

A total of 12 patients in the MMF group discontinued the intervention for various reasons, and six were lost to follow-up. In the control group, 20 discontinued the intervention and two were lost to follow-up. However, all 130 patients in the trial were included in the primary and secondary outcome analyses.

Should clinicians consider prescribing MMF to patients with new-onset SLE? “We usually wait until later when there are indications of more severe disease, but here they started it from the time of diagnosis if the patient was anti-dsDNA–positive. Given insurance restrictions in this country, we would be unlikely to be able to do that for many patients,” Costenbader said. “They likely also overtreated a lot of patients who didn’t need it. Due to our lack of more specific biomarkers and precision medicine for lupus, we do currently undertreat a lot of patients, as this study highlights, as well as overtreat others.”

How Much Might Cost Factor Into Treatment Decisions?

The study did not examine cost. Prednisone and hydroxychloroquine sulfate are inexpensive, but James said MMF can cost about $450 a month at the study dosage. However, she said, “the average hospitalization without an ICU [intensive care unit] visit for an SLE patient is about $15,000-$20,000. If you can avoid one hospitalization, you can pay for nearly 4 years of MMF. More importantly, from a financial perspective, if you can convert a severe lupus patient to a mild/moderate lupus patient, then the annual costs of lupus decrease nearly by half, from about $52,000 per year to $25,000 per year.”

The study authors noted various limitations such as the small number of subjects, the need for a longer trial “to determine the advantages and disadvantages of early application of MMF,” and the fact that all subjects were Asian. The authors also called for confirmation via a double-blind, placebo-controlled study.

The study was funded by grants to the authors by the National Natural Science Foundation of China, Shanghai Rising-Star Program, Natural Science Foundation of Shanghai, Five-Year National Key R&D Program, and Ruijin–Zhongmei Huadong Lupus Funding. The authors had no disclosures.

Costenbader disclosed consulting/research collaboration relationships with AstraZeneca, Amgen, Biogen, Bristol Myers Squibb, GSK, Merck, Gilead, and Cabaletta. James and Wallace had no disclosures.

Randy Dotinga is an independent writer and board member of the Association of Health Care Journalists.