How much progress has there been in the second-line treatment of multiple sclerosis: A 2017 update

In 1993, the US Food and Drug Administration (FDA) approved the first drug specifically for treating multiple sclerosis (MS). More than two decades later, a dozen such treatments are now available. Of these, four are considered second-line treatments for use in escalation strategies and two new drugs are currently undergoing accreditation procedures. Soon, they will provide clinicians with a range of six effective disease-modifying treatments (DMTs) to thwart the inflammatory processes in MS patients with active disease. However, while such a large number of DMTs for MS can help to control early inflammation, any decisions to be made by clinicians have also been made substantially more complex. This complexity is increased by the lack of head-to-head studies comparing these second-line therapies and the benefit–risk profiles for each of these drugs, which are likely to vary among patients. Ultimately, good awareness of the benefits and, more important, the risks of each MS DMT is crucial for the effective management of inflammation in MS.     

Amino acid metabolism as drug target in autoimmune diseases

In mammals, amino acid metabolism has evolved to control immune responses. Autoimmune diseases are heterogeneous conditions that involve the breakdown of tolerogenic circuitries and consequent activation of autoreactive immune cells. Therefore, critical enzymes along amino acid degradative pathways may be hijacked to keep in check autoimmunity. We examined here current knowledge of indoleamine 2,3-dioxygenase 1 (IDO1) and arginase 1 (ARG1), the main enzymes catabolizing tryptophan and arginine, respectively, in organ-specific and systemic autoimmune diseases as well as in the development of autoantibodies to therapeutic proteins. At variance with neoplastic contexts, in which it is known to act as a pure immunosuppressive molecule, ARG1 exhibited a protective or pathogenetic profile, depending on the disease. In contrast, in several autoimmune conditions, the bulk of data indicated that drugs capable of potentiating IDO1 expression and activity may represent valuable therapeutic tools and that IDO1-based immunotherapeutic protocols could be more effective if tailored to the genetic profile of individual patients.     

Risk of opportunistic infections in patients treated with alemtuzumab for multiple sclerosis

Introduction: Alemtuzumab is a monoclonal anti CD-52 antibody recently approved for use in relapsing-remitting multiple sclerosis(MS). Given that the targeted antigen is primarily expressed on B and T lymphocytes, the administration of this biological drug is associated with rapid but protracted peripheral lymphopenia.

Areas covered: The impact on infective risk of this immune impairment is still to be fully understood. In this review, we attempt to summarize all the available literature concerning opportunistic infections occurring in patients with MS receiving alemtuzumab. Infective adverse events were observed in more than 70% of patients in phase 2/3 RCTs, mainly of mild-to-moderate severity. Nevertheless, several post-marketing reports documented cases of serious, rare, and unexpected infections.

Expert Opinion: Predictive risk factors and prognostic features of opportunistic infections in this setting still need to be exactly assessed. At present, the only recommended preventive measures consist in anti-herpetic prophylaxis, Listeria-free diet, Tuberculosis prophylaxis and annual Papillomavirus screening. Given the non-negligible risk of unpredicted infective events, we advise physicians to take into account patients’ history of infectious diseases and vaccine status and to consider supplementary prophylactic strategies, including screening for Toxoplasma gondii and viral hepatitis serostatus as well as pre-emptive approaches to avert CMV reactivation and Pneumocystosis.     

Neurologic symptoms and diagnosis in adults with mast cell disease

Objective

To identify complications of mastocytosis that impact the nervous system across a large cohort.

Patients and methods

In this retrospective series, we reviewed the electronic medical records of adult patients with a diagnosis of mastocytosis who were referred to a Neurologist at Mayo Clinic in Rochester, MN from January 1, 1999 to December 31, 2008.

Results

Thirty patients were identified who presented to a Neurologist with symptoms potentially related to the mast cell disease. Twelve of these patients presented with complex spells involving syncope, which frequently preceded a formal diagnosis of mastocytosis. Nine individuals presented with acute back pain which was ultimately deemed symptomatic of vertebral compression fractures. One individual experienced spinal cord compression from a vertebral mast cell infiltrate. Headaches were reported in 78/223 (35%) total patients with mastocytosis. Although details of headaches were insufficiently ascertained to diagnose most, the five individuals in our referral cohort met International Headache Society (IHS) criteria for migraine. Finally, three individuals (1.3%) were identified with multiple sclerosis occurring at variable times after the mast cell diagnosis.

Conclusion

Symptoms related to mastocytosis may be encountered by neurologists and mimic many common, often idiopathic syndromes including, syncopal spells, back pain, and headache. In our cohort, multiple sclerosis may be over-represented. Mastocytosis should be considered in patients with these presentations, especially when also accompanied by flushing, abdominal cramping or diarrhea.     

多发性硬化急性期和缓解期的治疗进展

多发性硬化（Ms）是中枢神经系统最常见的慢性炎性脱髓鞘疾病,最常累及的部位为脑室周围白质、视神经、脊髓、脑于和小脑,病因和发病机制迄今不明。MS为缓慢进行性疾病,其治疗过程长,目前尚无完全治愈本病的药物。复发缓解型MS（RRMS）是MS最常见的类型,约占80％～85％,对其急性期和缓解期的治疗有助干减少肓发．减缓疾病讲展．提高患者生存质量。该文就这方面的研究进展进行综述。     

Therapy of MS

The era of disease-modifying drugs (DMDs) in multiple sclerosis (MS) treatment began in the 1990s, first with interferon-β (IFNβ), and the number of agents has increased steadily since then. Currently, there are six different parenteral formulations approved for MS treatment and many other oral and parenteral ones are in different stages of investigation or awaiting approval by federal agencies.     

Evaluation of efficacy,safety and tolerability of fingolimod in patients with the relapsing form of multiple sclerosis – 12-month observation. A preliminary report

Background and purposeOral fingolimod 0.5 mg daily was approved in the European Union in 2011 for the treatment of relapsing multiple sclerosis in the aggressive form and as a second line treatment in patients with high disease activity despite interferon beta therapy. The aim of this study was the evaluation of efficacy, safety and tolerance of fingolimod in patients with relapsing-remitting multiple sclerosis (RRMS) during a 12-month observation period.Material and methodsThe investigated group consisted of 11 patients aged between 23 and 63 years. All patients underwent immunomodulatory treatment (disease modifying drugs – DMD) or immunomodulatory treatment in combination with mitoxantrone (Mx) without a positive effect for 3–5 years. Patients received oral fingolimod 0.5 mg daily during 12 months. Disability was evaluated with Kurtzke Expanded Disability Status Scale (EDSS) scale. Safety and tolerability of fingolimod were evaluated by adverse events monitoring, laboratory tests, and ophthalmological and skin assessment.ResultsBefore the initiation of fingolimod treatment all the patients progressed in disability and in MRI changes including five cases with gadolinium-enhancing lesions. During fingolimod treatment there was no new relapse in any patient and no patient stopped the treatment because of any adverse event. During the 12-month treatment, EDSS improvement was observed in seven patients, three patients were stable, and one patient progressed by 0.5 point in the EDSS.ConclusionsIn our study patients fingolimod was effective, safe and well tolerated independently of disease activity and previous treatment.     

The complex etiology of multiple sclerosis

Multiple sclerosis is a demyelinating disease which is presumed to be a consequence of infiltrating lymphocytes autoreactive to myelin proteins. This is substantiated by several lines of clinical evidence and supported by correlative studies in preclinical models. The development of new therapeutics for MS has been guided by this perspective; however, the pathogenesis of MS has proven to be quite complex as observations exist which question the role of autoreactive lymphocytes in the etiology of MS. In addition the current immunomodulatory therapeutics do not prevent most patients from progressing into more serious forms of the disease. The development of truly transformational therapeutics for MS will likely require a broad assault that expands beyond the concept of MS being an autoimmune disease.     

Fas expression on T cells and sFas in relapsing-remitting multiple sclerosis

OBJECTIVES: To investigate the proportions of peripheral blood CD4+/Fas+ and CD8+/Fas+ cells and serum sFas levels in relapsing-remitting multiple sclerosis (RRMS) patients with relapses (active RRMS), those without relapses (stable RRMS), and controls over 1 year. MATERIAL AND METHODS: Sixteen RRMS patients and 10 controls were tested monthly. Cells were analyzed by dual immunofluorescence and the sFas levels by ELISA. There were 14 relapses which occurred 1223 days after the last control visits. The measurements performed at these visits in the active RRMS patients were considered as relapse-related, while the rest were regarded as relapse-unrelated. RESULTS: In active RRMS patients the median of CD4+ Fas+ to total CD4+ and CD8+ Fas+ to total CD8+ from relapse-related measurements were higher than the median from relapse-unrelated measurements (P=0.003, 0.004, respectively). The median of CD4+ Fas+ to total CD4+ from relapse-unrelated measurements in active RRMS was higher compared with stable RRMS (P = 0.005) and controls (P = 0.004). The sFas level from relapse-unrelated measurements was also higher in active RRMS than in stable RRMS (P = 0.04) and in controls (P = 0.004). CONCLUSIONS: We suggest that increased expression of Fas antigen on CD4+ subset and increased serum sFas level are valuable markers of clinical activity in MS.