Long-term effectiveness and tolerability of galcanezumab in patients with migraine excluded from clinical trials: real world evidence of 1055 patients with 1 year follow-up from the Galca-Only registry.

BACKGROUND: Galcanezumab has shown efficacy and effectiveness in the treatment of episodic and chronic migraine (CM), however, the population represented in randomized clinical trials (RCTs) differs from the population observed in real-world setting. To describe the long-term effectiveness and tolerability of galcanezumab in clinical practice in patients excluded from RCTs. METHODS: Multicenter prospective cohort study of consecutive patients with chronic and high-frequency episodic migraine (HFEM) with prior failure to three or more migraine preventive drugs, treated with galcanezumab and followed up for 12 months. RESULTS: We enrolled 1055 patients, aged 50 (IQR: 42-58), 82.9% female, 76.4% chronic migraine, 69% with at least one exclusion criteria for RCTs, including age > 65 (n = 121), concomitant use of onabotulinumtoxinA (n = 185), daily headache at baseline (n = 347), chronic painful syndromes (n = 206), fibromyalgia (n = 101) or treatment resistance (n = 957). The median number of prior preventive treatments was 4 (IQR: 3-5). The retention rate was 90.8%, 76.8% and 71.4% at 3, 6 and 12 months. The main reasons for treatment discontinuation were lack of effectiveness (21.1%) and inadequate tolerability (6.6%). The 30%, 50% and 75% responder rates were 62.6%, 49.8% and 24.2% between weeks 8-12; 60.9%, 48.8% and 24.6% between weeks 20-24; and 59.7%, 48.3% and 24.6% between weeks 44-48. Daily headache at baseline (OR: 0.619; 95%CI: 0.469-0.817) and patient's age (OR: 1.016; 95%CI: 1.005-1.026) were associated with 50% response at weeks 20-24. The variables that were associated with a higher reduction of headache days between weeks 20-24 were patient's age (0.068; 95% CI: 0.018-0.119) and headache days per month at baseline (0.451; 95% CI: 0.319-0.583), while psychiatric comorbidity (-1.587; 95% CI: -2.626-0.538) and daily headache at baseline (-2.718; 95% CI: -4.58-0.869) were associated with fewer reduction in the number of headache days between weeks 20-24. CONCLUSION: This study provides class III evidence of effectiveness and tolerability of galcanezumab in patients with HFEM and CM with comorbidities that would result in exclusion of the pivotal RCTs. Nonetheless, the clinical results over a 12-month period were similar to the efficacy observed in randomized controlled trials. Few patients discontinued the drug due to inadequate tolerability.

A literature review of cost-of-illness studies on the economic burden of multiple sclerosis.

BACKGROUND: Multiple sclerosis has both high healthcare and social impacts. OBJECTIVE: The purpose of this article is to analyse the available literature describing the economic burden of multiple sclerosis and to compare costs among studies examining main cost drivers. METHODS: A literature search on studies published in English on cost-of-illness of multiple sclerosis included in this review using PubMed, the Cochrane Library, SCOPUS and Web of Science includes a retrospective horizon and it describes direct and indirect costs in patients categorized into severity groups. RESULTS: Several papers were obtained from the database search (n=37). Additionally, results from "hand searching" were also included, where a wider horizon was considered. Cost estimates were compared among studies that used a societal perspective on costs, time-period studied, and year of price level used. The estimated total annual cost per patient in Europe is on average 40,300€ (n=20). In addition, differences by geographic areas and severity groups are also considered. All in all, the higher the severity, the higher the associated costs. CONCLUSIONS: This systematic review provides one clear finding: multiple sclerosis places a huge economic burden on healthcare models and societies due to productivity losses and caregiver burden. Moreover, costs of drugs were main cost determinants for less severe cases of multiple sclerosis and informal care and production losses for the most severe cases of multiple sclerosis.

No evidence of association between common European mitochondrial DNA variants in Alzheimer, Parkinson, and migraine in the Spanish population.

Certain mitochondrial DNA (mtDNA) variants and haplogroups have been found to be associated with neurological disorders. Several studies have suggested that mtDNA variation could have an etiologic role in these disorders by affecting the ATP production on high-energy demanding organs, such as the brain. We have analyzed 15 mtDNA SNPs (mtSNPs) in five cohorts of cases presenting Alzheimer disease (AD), Parkinson disease (PD), and migraine, and in controls, to evaluate the role mtDNA variation in disease risk. Association tests were undertaken both for mtSNPs and mitochondrial haplogroups. No significant association was detected for any mtSNP or haplogroup in AD and PD cohorts. Two mtSNPs were associated with one migraine cohort after correcting for multiple tests, namely, T4216C and G13708A and haplogroup J (FDR q-value = 0.02; Santiago's cohort). However, this association was not confirmed in a second replication migraine series. A review of the literature reveals the existence of inconsistent findings and methodological shortcomings affecting a large proportion of mtDNA association studies on AD, PD, and migraine. A detailed inspection of the literature highlights the need for performing more rigorous methodological and statistical standards in mtDNA genetic association studies aimed to avoid false positive results of association between mtDNA variants and neurological diseases.

Genética de la migraña / Genetics of migraine

Es evidente que la migraña se presenta con mayor frecuencia en algunos grupos familiares. Su transmisión genética no sigue un comportamiento acorde con las leyes de la herencia mendeliana; en ella intervienen múltiples factores, que son modulados por el medio ambiente. Se han hecho grandes avances en la identificación de los genes involucrados en la migraña, especialmente los que codifican a los receptores de serotonina, los canales iónicos y las citocinas, y en la determinación de sus variantes alélicas. En esta reseña se describen los estudios de rastreo genómico y sus resultados y se analizan las mutaciones genéticas y los cambios moleculares responsables de entidades como la migraña hemipléjica familiar, la migraña no hemipléjica, las mitocondriopatías y el CADASIL.

It is clear that migraine occurs more frequently in some family groups. Its genetic transmission does not follow a behavior consistent with the mendelian laws of inheritance, it involves multiple factors, wich are modulated by the environment. There has been many advances in the identification of the genes involved in migraine, specially those that encode the serotonin receptors, the ion channels and the cytokines, as well as in the determination of their allelic variants. This review describes the studies of genomic tracking and their results and analyzes the genetic mutations and molecular changes responsible for disorders such as familial hemiplegic migraine, non hemiplegic migraine, mitochondriopathies and the CADASIL syndrome.