In the randomized trial of first-line methotrexate, 48 of 65 patients treated with methotrexate plus steroid (74%) were responders. And among those 48 responders, 35 (73%) maintained a clinical remission for a mean of 25 months off-drug, while another 13 (27%) were in clinical remission on methotrexate. Twenty-eight patients developed side effects that were generally mild; no one required treatment discontinuation. At the 5-year mark, after an average of an initial 2 years on methotrexate, half of the patients were in a sustained clinical remission, which Dr. Stevens deemed “pretty good” considering the well established and manageable safety profile of the drug.
If a patient fails to respond to methotrexate plus corticosteroids within a few months or later experiences disease progression, Dr. Stevens’ second-line therapy is mycophenolate mofetil in conjunction with corticosteroids. Its use in arresting juvenile localized scleroderma is supported by two favorable published case series, the largest of which includes 10 patients (Rheumatology [Oxford]. 2009 Nov;48[11]:1410-3).
Dr. Stevens’ third-line therapy is intravenous abatacept at 10 mg/kg monthly along with intravenous methylprednisolone at 500 mg/week. There are five published case series, the most recent and largest of which included 13 adult patients, two of whom had en coup de sabre lesions (Acta Derm Venereol. 2018 Apr 16;98[4]:465-6). The biologic also shows promise in patients with advanced severe disease with deep tissue involvement (Semin Arthritis Rheum. 2017 Jun;46[6]:775-81). And abatacept has a plausible mechanism of action in localized scleroderma: French investigators have shown it induces regression of skin fibrosis in a mouse model of the disease (Ann Rheum Dis. 2016 Dec;75[12]:2142-9).
Her fourth-line strategy is the anti-interleukin-6 agent tocilizumab, again in conjunction with corticosteroids. In a translational study, tocilizumab has been shown to normalize dermal fibroblasts and collagen in patients with systemic sclerosis (Ann Rheum Dis. 2018 Sep;77[9]:1362-71). And there have been two promising small retrospective case series as well. A more definitive clinical trial is planned.
Dr. Stevens said that when starting a biologic agent in a child with localized scleroderma, she routinely adds methotrexate until the disease is under control.
Drugs supported by case reports and worth considering on an individual basis as a last resort are hydroxychloroquine, azathioprine, cyclosporine, and imatinib mesylate (Gleevec).
For mild, superficial lesions that don’t cross joints, ultraviolet light A phototherapy is a therapeutic option. It displayed significant benefit in a systematic review and meta-analysis of 19 studies comparing it to methotrexate, although the results with methotrexate were deemed superior (Semin Arthritis Rheum. 2018 Dec;48[3]:495-503).
The pros and cons of getting a baseline brain MRI
Children with localized scleroderma have increased rates of severe headache, peripheral neuropathy, complex partial seizures, and stroke. So it had been Dr. Stevens’ routine practice to obtain an initial brain MRI at the time of diagnosis. Of late, though, she has reconsidered that practice.
“The problem is that some patients with abnormal MRI lesions have no CNS disease at all, and there are also a fair number of patients with a normal MRI who have CNS symptoms. So in our practice we’re pulling back on doing screening MRIs because we don’t know what to do with the findings, and it just makes everybody worried,” she said.
However, if a child with localized scleroderma develops headaches, seizures, neuropathies, or other CNS symptoms, then by all means get an MRI, and if it shows findings such as brain atrophy, white matter lesions, calcifications, or leptomeningeal enhancement, consider treatment, she added.
Dr. Stevens reported receiving research funding from Kineta and Seattle Genetics.