The results of an international, three-year, Phase III trial of a potential new drug that treats systemic lupus erythematosus (SLE) have been published in the New England Journal of Medicine.
Lupus is an autoimmune disease in which the immune system attacks healthy parts of the body. It is particularly insidious disease as it has a ten-year mortality of 10%, “which if you are diagnosed in your early twenties is a terrible outcome,” according to Professor Eric Morand of Monash University, Australia, who oversaw the global trial in over 360 people with SLE.
The trial, called TULIP 2, evaluated AstraZeneca’s anifrolumab and achieved a statistically-significant and clinically-meaningful reduction in disease activity versus placebo, with both arms receiving standard of care.
Professor Morand has also been key in developing new lupus assessment criteria.
According to Professor Morand, there has only been one new treatment approved for the disease in the last 60 years, which is not available on the Pharmaceutical Benefits Scheme in Australia.
Between 60% and 80% of adults with SLE show increased interferon-induced genes, which reflect overproduction of the immune protein Type 1 interferon. While previous attempts to block this protein in lupus have failed, the potential new treatment, anifrolumab, works by blocking the receptor on all cells in the body, aiming to reverse the triggering of lupus symptoms.
Professor Morand said that interferon is associated with other autoimmune diseases such as Scleroderma and Sjogren’s disease “so there may be potential for using anifrolumab in the treatment of other interferon related diseases as well.”
In the TULIP 2 trial, eligible patients received a fixed-dose intravenous infusion of anifrolumab or placebo every four weeks. TULIP 2 assessed the effect of anifrolumab in reducing disease activity – noting a significant effect in global disease activity measures.
The trial, from 2015 to 2018, involved 362 patients receiving either 300mg of the drug or placebo intravenously once every four weeks for 48 weeks. Benefit was measured using a defined clinical assessment of improvement in all organs as well as the number of flare ups (which see the patient experiencing fever, painful or swollen joints, fatigue, rashes or sores or ulcers in the mouth or nose). The volunteers were aged between 18 and 70 and had moderate to severe disease despite standard treatments. Patients with SLE typically die of organ failure.
The study found that – 52 weeks after the trial started – significantly more patients on the drug than the placebo had:
A reduction in overall disease activity in all active organs
Improvement in lupus skin disease
A reduction in steroid drug doses
Reduced annual rate of flares
The TULIP 2 trial followed on from the TULIP 1 trial which failed to meet its primary outcome. The second trial, published in the New England Journal of Medicine, used a different endpoint. “Measurement of treatment response in SLE has been very problematic and this represents a kind of second breakthrough of this trial,” Professor Morand said.
The study was done in collaboration with colleagues in Japan, the UK, the US, France and South Korea.