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Background: miR-155 is involved in the generation and maintenance of inflammation and pain, endothelial function and immune system homeostasis, all functions that are relevant for migraine. The present study aims to assess the levels of miR-155 in migraine subtypes (episodic and chronic) in comparison to age- and sex-matched healthy controls., Methods: This is a cross-sectional, controlled, study involving three study groups: I) episodic migraine (n = 52, EM), II) chronic migraine with medication overuse (n = 44, CM-MO), and III) healthy controls (n = 32, HCs). We assessed the interictal gene expression levels of miR-155, IL-1β, TNF-α, and IL-10 in peripheral blood monocytes using rtPCR. The monocytic differentiation toward the M1 (pro-inflammatory) or M2 (anti-inflammatory) phenotypes was assessed in circulating monocytes with flow cytometry analysis and cell sorting., Results: miR-155 gene expression was higher in CM-MO group (2.68 ± 2.47 Relative Quantification - RQ) when compared to EM group (1.46 ± 0.85 RQ, p = 0.006) and HCs (0.44 ± 0.18 RQ, p = 0.001). In addition, miR-155 gene expression was higher in EM group when compared to HCs (p = 0.001). A multivariate analysis confirmed the difference between EM and CM-MO groups after correction for age, sex, smoking habit, preventive treatment, aura, presence of psychiatric or other pain conditions. We found higher gene expression of IL-1β, TNF-α, and lower gene expression of IL-10 in migraine participants when compared to HCs (p = 0.001 for all comparisons). TNF-α and IL-10 genes alterations were more prominent in CM-MO when compared to EM participants (p = 0.001). miR-155 positively correlated with IL-1β (p = 0.001) and TNF-α (p = 0.001) expression levels. Finally, in people with CM-MO, we described an up-regulated percentage of events in both M1 and M2 monocytic profiles., Conclusions: Our study shows for the first time a specific profile of activation of miR-155 gene expression levels in monocytes of selected migraine subpopulations, more pronounced in subjects with CM-MO. Interestingly, mir-155 expression correlated with markers of activation of the inflammatory and immune systems. The CM-MO subpopulation showed a peculiar increase of both pro-inflammatory and anti-inflammatory monocytes which worths further investigation., Trial Registration: www., Clinicaltrials: gov . (NCT05891808)., (© 2024. The Author(s).)

Background: In Italy, monoclonal antibodies targeting the CGRP pathway are subsidized for the preventive treatment of high frequency and chronic migraine (CM) in patients with a MIgraine Disability ASsessment (MIDAS) score ≥ 11. Eligibility to treatment continuation requires a ≥ 50% MIDAS score reduction at three months (T3). In this study, we evaluate whether a ≥ 50% MIDAS score reduction at T3 is a reliable predictor of response to one-year erenumab treatment., Methods: In this prospective, open-label, real-world study, 77 CM patients were treated with erenumab 70-140 mg s.c. every 28 days for one year (T13). We collected the following variables: monthly migraine days (MMDs), monthly headache days (MHDs), days of acute medication intake, MIDAS, HIT-6, anxiety, depression, quality of life and allodynia. Response to erenumab was evaluated as: i) average reduction in MMDs during the 1-year treatment period; and ii) percentage of patients with ≥ 50% reduction in MMDs during the last 4 weeks after the 13 th injection (Responders T13 )., Results: Erenumab induced a sustained reduction in MMDs, MHDs and intake of acute medications across the 12-month treatment period, with 64.9% of patients qualifying as Responders T13 . At T3, 55.8% of patients reported a ≥ 50% reduction in MIDAS score (MIDAS Res ) and 55.4% of patients reported a ≥ 50% reduction in MMDs (MMD Res ). MIDAS Res and MMD Res patients showed a more pronounced reduction in MMDs during the 1-year treatment as compared to NON-MIDAS Res (MIDAS Res : T0: 23.5 ± 4.9 vs. T13: 7.7 ± 6.2; NON- MIDAS Res : T0: 21.6 ± 5.4 vs. T13: 11.3 ± 8.8, p = 0.045) and NON-MMD Res (MMD Res : T0: 23.0 ± 4.5 vs. T13: 6.6 ± 4.8; NON-MMD Res : T0: 22.3 ± 6.0 vs. T13: 12.7 ± 9.2, p < 0.001) groups. The percentage of Responders T13 did not differ between MIDAS Res (74.4%) and NON-MIDAS Res (52.9%) patients (p = 0.058), while the percentage of Responders T13 was higher in the MMD Res group (83.3%) when compared to NON-MMD Res (42.9%) (p = 0.001). MMD Res predicted the long-term outcome according to a multivariate analysis (Exp(B) = 7.128; p = 0.001), while MIDAS Res did not. Treatment discontinuation based on MIDAS Res would have early excluded 36.0% of Responders T13 . Discontinuation based on "either MIDAS Res or MMD Res " would have excluded a lower percentage (16%) of Responders T13 ., Conclusion: MIDAS Res only partly reflects the 12-month outcome of erenumab treatment in CM, as it excludes more than one third of responders. A criterion based on the alternative consideration of ≥ 50% reduction in MIDAS score or MMDs in the first three months of treatment represents a more precise and inclusive option., Trial Registration: The trial was retrospectively registered at www., Clinicaltrials: gov (NCT05442008). CGRP: Calcitonin Gene Related Peptide., Midas: MIgraine Disability Assessment. MMDs: monthly migraine days. MIDAS Res : Patients with a MIDAS score reduction of at least 50% at T3. MMD Res : Patients with a MMDs reduction of at least 50% at T3. Responder T13 : Patients with a MMDs reduction from baseline of at least 50% in the last 4 weeks of observation period (after 13 erenumab administrations). T0: First erenumab administration. T3, T6, T9, T12: Follow-up visits at three, six, nine, and twelve months after first erenumab administration. T13: Last visit of the protocol., (© 2022. The Author(s).)

Background: Monoclonal antibodies (mABs) targeting the calcitonin gene-related peptide (CGRP) pathway represent the first disease-specific preventive migraine therapy. Growing evidence suggests that they are effective in the preventive treatment of difficult-to-treat patients. In this study, we evaluated the psychological predictors of the outcome of treatment with the anti-CGRP monoclonal antibody erenumab in patients with chronic migraine (CM)., Methods: Seventy-five patients with CM who had already failed at least 3 preventive therapies received erenumab every 28 days for a period of 12 months. Before the first administration, patients received a full psychological evaluation using The Structured Clinical Interview for DSM-5 Clinician Version (SCID-5-CV) to assess personality disturbances (primary outcome), mood and anxiety disorders, and as well specific questionnaires to evaluate alexithymia traits, childhood traumas, and current stressors (secondary outcomes)., Results: After 12 months of treatment, 53 patients reported a reduction of at least 50% in headache days/per month (Responders), whereas 22 did not (Non Responders). When compared to Responders, Non Responders were characterized by a higher prevalence of personality disorders belonging to Cluster C (avoidant, dependent, and obsessive-compulsive) (77% vs 37%, p = .001). Non Responders were also characterized by a higher prevalence of anxiety disorders (90% vs 60%, p = 0.007), showed more alexithymic traits (51.7 ± 13.7 vs 42.9 ± 14.3, p = 0.017), and reported a higher number of 'at least serious' current stressors (3.2 ± 4.0 vs 0.8 ± 1.4, p < .0001) than Responders. At the multivariate analysis, higher prevalence of Cluster C personality disorders (OR 3.697; p = 0.05) and higher number of 'at least serious' life events (OR 1.382; p = 0.017) arose as prognostic factors of erenumab failure., Conclusions: Erenumab confirmed its effectiveness in a population of difficult-to-treat migraine. The presence of "anxious-fearful" personality together with current stressors and anxiety represent negative predictors of treatment outcome., Trial Registration: The study protocol was registered at clinicaltrials.gov ( NCT04361721 )., (© 2021. The Author(s).)

Medication overuse headache (MOH) can be considered a clinical condition at the boundaries between drug addiction and chronic pain disorder. The common 196G > A single-nucleotide polymorphism of BDNF gene, resulting in a valine 66 to methionine (Val66Met), is related with behaviour disorders and substance abuse. With the aim of identifying a worsening factor in MOH, rather than the detection of a specific risk factor for the development of the disease, we investigated whether the presence of a functional BDNF polymorphism might determine clinical differences within a group of 90 MOH patients, particularly in monthly drug consumption, that is the hallmark of disease. Directly comparing MOH patients homozygous for G allele (G/G) with carriers of A allele (non-G/G), we have observed 47 G/G genotypes and 60 non-G/G genotypes. Non-G/G had a higher consumption of monthly drug number (Cohen's d = 0.76) than G/G patients. At multiple regression analysis, the Val66Met BDNF polymorphism emerged as a significant independent predictor of analgesic drug consumption (Beta = 0.33, Cohen's f(2) = 0.134). These findings showed an influence of examined BDNF polymorphism in the MOH clinical features, supporting the idea that MOH is a substance abuse disorder.

Clinical outcomes of migraine treatment are generally based on two major endpoints: acute pain resolution and effects on quality of life (QOL). Resolution of acute pain can be evaluated in a number of ways, each increasingly challenging to achieve; pain relief, pain freedom at 2 h, sustained pain-freedom, and SPF plus no adverse events (SNAE, the most challenging). QOL questionnaires help assess the burden of migraine and identify optimal treatments. Pain resolution and improved QOL form the basis of the ultimate target-meeting patient expectations, to achieve patient satisfaction. To achieve this, it is crucial to choose appropriate endpoints that reflect realistic treatment goals for individual patients. Moreover, SNAE can help discriminate between triptans, with almotriptan having the highest SNAE score. Kaplan-Meier plots are also relevant when evaluating migraine treatments. The use of symptomatic medication may lead to the paradoxical development of medication-overuse headache. In general practice, patients should use simple tools for pain measurement (e.g. headache diary) and a QOL questionnaire. A composite endpoint of pain resolution and QOL restoration would constitute a step forward in migraine management.

Medication-overuse headache (MOH) is one of the headache forms that most frequently prompts patients to consult a specialist headache centre. The prevalence of this form in the general population is approximately 1-2%. Around 40% of patients seen at headache centres present with a chronic form of headache and 80% of this chronic headache patients make excessive use of symptomatic drugs. MOH shows a clinical improvement, accompanied by a reduction in the consumption of analgesic drugs, if patients are submitted to detoxification therapy. But detoxification is only the first stage in a long and complex course of care and global approach demands adequate follow-up visit to prevent early relapses. At the Headache Centre of the C. Mondino Institute of Neurology in Pavia, a course of care (CARE: ) has been developed for the complete management of patients with MOH both during Hospitalization and during the subsequent follow-up period. CARE: IS designed to trace the clinical, psychopathological and pharmacological profile of MOH in the short-, medium- and long-term; to look for factors possibility predictive of relapse; to assess the direct costs linked to overuse-headache in the year leading up to and following detoxification; and to evaluate disability, in terms of working days lost, before and after detoxification.