What this is
- This study evaluates the effects of galcanezumab on sleep quality and migraine outcomes in Turkish patients with episodic and chronic migraine.
- Fifty-four patients received galcanezumab injections over three months, assessing sleep quality and various patient-reported outcome measures.
- Findings indicate significant improvements in sleep quality and migraine-related metrics, particularly in patients with baseline sleep disorders.
Essence
- Galcanezumab significantly improves sleep quality and reduces migraine frequency and severity in patients with episodic and chronic migraine. Improvements are particularly notable in those with sleep disorders.
Key takeaways
- Galcanezumab reduced the percentage of patients with poor sleep quality from 72.7% at baseline to 56.2% by the second month. This suggests a meaningful enhancement in sleep among migraine patients.
- Patients reported a significant reduction in monthly headache days (MHDs) over the treatment period, with a median response rate of 75% at the first month. This indicates rapid efficacy in migraine management.
- The treatment also led to improvements in various patient-reported outcome measures, including significant reductions in scores for anxiety and depression, highlighting its multifaceted benefits.
Caveats
- The study's single-center design and limited sample size may limit the generalizability of the findings. Broader studies are needed for more comprehensive insights.
- Reliance on self-reported measures for emotional states and sleep quality may not fully capture the complexity of these conditions, potentially affecting data accuracy.
- The short 3-month follow-up period may not adequately reflect long-term treatment effects or potential risks associated with galcanezumab.
Definitions
- Pittsburgh Sleep Quality Index (PSQI): A 19-item questionnaire assessing sleep quality across seven components, with higher scores indicating poorer sleep quality.
- Migraine Disability Assessment Scale (MIDAS): A self-administered questionnaire that quantifies headache-related disability based on activity limitations due to migraine.
- Headache Impact Test-6 (HIT-6): A 6-item questionnaire measuring the impact of headaches on daily functioning and quality of life, with higher scores indicating greater impact.
AI simplified
Introduction
Migraine is a highly prevalent disabling complex neurological disorder and a major cause of global population ill health with adverse effects on multiple domains (personal, psychosocial and economic) besides the neurobiological symptoms (1โ3). Migraine remains inadequately treated despite its association with considerable disability, impaired functioning, and decreased quality of life (QoL) in patients and a substantial socioeconomic burden (2โ5).
Many sleep disorders (i.e., insomnia, restless legs syndrome, sleep apnea, and daytime sleepiness) and psychiatric comorbidities (anxiety and depression in particular) are more prevalent among migraine patients than in the general population, as associated with increased headache frequency and migraine disability, poor treatment response and an increased risk for migraine progression to chronic form over time in these patients (4, 6โ8).
The relationship between sleep and migraine is intricate (9). While their bidirectional comorbidity is well-established, the nature of this relationship is still not fully understood (4, 8). Patients with chronic migraine (CM) tend to experience more symptoms of insomnia compared to patients with episodic migraine (EM), suggesting a potential link between sleep disturbances and the progression of migraine (8, 10). Migraineurs are significantly more likely to suffer from poor sleep quality, insomnia and night-time fatigue (4). The frequency of headaches in CM patients decreased following insomnia treatment, highlighting the impact of sleep on migraine patterns (11). In addition, another study identified a correlation between high monthly headache frequency and diminished sleep quality within a broader population of migraine patients (12). This correlation emphasizes the complex connection between the frequency of headaches and the overall quality of sleep in individuals with migraine. Understanding and addressing these links could potentially lead to more effective strategies for managing and treating migraine in affected populations. A meta-analysis revealed that patients with migraine generally scored higher on the Pittsburgh Sleep Quality Index (PSQI) compared to healthy controls (13). Elevated PSQI scores, indicate poor sleep quality, and are associated with increased migraine-related burden (14).
Galcanezumab, a humanized monoclonal antibody (mAb) targeting calcitonin gene-related peptide (CGRP)-mediated signaling cascade, is specifically developed for migraine prophylaxis in adults with EM and CM (15, 16). Several studies have consistently shown the efficacy of galcanezumab in enhancing migraine outcomes, including improvements in functional and disability scores, all while maintaining a favorable safety and tolerability profile (15โ17).
Indeed, most comorbidities are considered among the exclusion criteria in the clinical trial settings. Therefore, real-world galcanezumab studies in migraineurs with comorbidities such as sleep disorders and anxiety and/or depression are of critical importance to investigate the effectiveness of this treatment on different migraine facets beyond the reduction of both monthly headache days (MHDs) and monthly migraine days (MMDs) (16, 18). Studies on how galcanezumab treatment affects sleep in migraine patients are lacking. Our real-world study in EM and CM patients aimed to investigate the impact of the galcanezumab injection series on sleep quality and migraine outcome in addition to several multidimensional patient-reported outcome measures (PROMs) such as negative emotional states, Health-related Quality of Life (HRQoL), headache impact and migraine-related disability.
Materials and methods
Study population
In this retrospective cohort study, patients between 18 and 65 diagnosed with EM and CM were included, according to the third edition of the International Classification of Headache Disorders (ICHD-3) (19). Participants were recruited from a tertiary headache center and evaluated by experienced headache specialists. The physician documented the patientsโ detailed sociodemographic data during their baseline interview and asked them to complete PROMs. The patients were seen again at the second, third, and fourth visits, 1 month apart. At each visit, changes in headache days and migraine characteristics were recorded according patientsโ headache diaries, and they were asked to fill out PROMs. Patients who did not attend regular follow-ups or incompletely filled out the forms were not included.
During the study period, the enrolled patients did not receive any other prophylactic treatment for migraine, additional antidepressant therapy, sleep medications, nerve blocks, or trigger point injections. Exclusion criteria included pregnant or breastfeeding women, illiteracy, unstable medical conditions, as well as individuals who had recently initiated a new psychiatric medication or undergone dose adjustments for ongoing psychiatric medication within the 3โmonths preceding the study enrollment.
This study was approved by Acibadem University School of Medicine Medical Research Ethics Committee (Approval number: 2023-20/671).
Study parameters
Data on the participantsโ demographic features, migraine type and comorbid diseases were documented at baseline. The sleep quality was evaluated with PSQI. The migraine outcomes were assessed using patient-recorded monthly headache days (MHDs), monthly migraine days (MMDs) and headache severity documented in a headache diary. PROMs including Migraine Disability Assessment Scale (MIDAS), Headache Impact Test-6 (HIT-6), 12-item Allodynia Symptom Checklist (ASC-12), SF-36 Health-related Quality of Life (SF-36 HRQoL), Beck Anxiety Inventory (BAI) and Beck Depression Inventory (BDI) were recorded at baseline and follow-up visits. A numeric rating scale (NRS) was used to describe pain severity (0 means no pain, 10 means the worst pain imaginable). Additionally, safety outcomes were evaluated during follow-up visits.
Galcanezumab injection series
Galcanezumab (Emgalityยฎ, Eli Lilly and Company, Indianapolis, United States; 120โmg/mL solution in a single-dose prefilled syringe) was administered subcutaneously in 240-mg loading dose (2 consecutive 120-mg injections) at baseline visit (visit 1), and then at 120โmg dose on a monthly basis for three consecutive visits including visit 2 (1st month), visit 3 (2nd month), and visit 4 (3rd month).
Responder definition
Galcanezumab responders were identified as individuals who experienced a reduction of 50% or more in monthly headache days (MHDs) between baseline and the third month of treatment. Conversely, non-responders were characterized as those with less than a 50% reduction in MHDs during the 3-month treatment period.
PSQI
The PSQI is a comprehensive 19-item questionnaire designed to evaluate sleep quality. It encompasses seven components, each contributing to a specific aspect of sleep assessment. These components include subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleep medications, and daytime dysfunction. Each component is assigned a score ranging from 0 to 3, and the cumulative sum of these component scores produces a global score with a potential range of 0 to 21. Higher global scores indicate lower sleep quality. Interpreting the results, a total PSQI score below 5 is indicative of โgood sleep qualityโ, while a score of 5 or higher suggests โpoor sleep qualityโ. This scoring system provides a quantitative measure to assess and categorize an individualโs sleep patterns based on various components (20, 21).
MIDAS
The MIDAS is a self-administered questionnaire consisting of five items. Its purpose is to quantitatively assess headache-related disability by considering the number of days affected and the resulting activity limitations due to migraine over the past 3 months. The final total score is categorized depending on the severity of attacks as little or no disability (scores 0โ5), mild disability (scores 6โ10), moderate disability (scores 11 to 20) or severe disability (scores โฅ 21) (22, 23).
HIT-6
HIT-6 is a 6-item questionnaire with domains on pain, social functioning, role functioning, vitality, cognitive functioning, and psychological distress. Each item is answered on a 5-point Likert scale (6 = never, 8 = rarely, 10 = sometimes, 11 = very often, 13 = always). The total score ranges between 36 and 78 with higher scores reflecting more significant impact (24, 25).
SF-36 HRQoL
The SF-36 is a self-administered questionnaire designed to assess HRQoL across eight domains. These domains encompass physical functioning, physical and emotional role limitations, bodily pain, general health perception, vitality, social functioning, and mental health. The total scores derived from the SF-36 range from 0 to 100, with higher transformed scores serving as an indicator of a better health status (26, 27).
BDI
BDI is a 21-item self-reporting questionnaire for the assessment of the level and change in the severity of depression over the past 2 weeks, based on physical, emotional, cognitive, and motivational symptoms. Each item is scored on a 4-point scale from 0 (no symptom) to 3 (severe symptoms), while the total score (range, 0 to 63) is calculated by finding the sum of the 21 items with higher scores indicating greater symptom severity. Based on the total score individuals are categorized to have severe (scores 30โ63), moderate (scores 19โ29), mild (scores 10โ18) and none/minimal depression (scores 0โ9) (28, 29).
BAI
This 21-item scale is a self-report measure of anxiety. Each item is scored on a 4-point scale from 0 (not at all) to 3 (severelyโit bothered me a lot), and the total score is calculated by finding the sum of the 21 items and classified as low (scores 0โ21), moderate (scores 22โ35) and potentially concerning levels of anxiety (scores โฅ 36) (30, 31).
Safety outcome
The assessment of safety outcomes in this context was conducted by considering various factors, including treatment-emergent adverse events (TEAE), serious adverse events (SAE), deaths, discontinuation rates, and monitoring vital signs such as blood pressure, pulse, temperature, and weight.
Statistical analysis
Statistical analysis was performed using the MedCalcยฎ Statistical Software version 19.7.2 (MedCalc Software Ltd., Ostend, Belgium; https://www.medcalc.orgโ; 2021). ShapiroโWilkโs test investigated the normality of continuous variables. For comparison of more than two groups non-normally distributed continuous data Friedman Test was used. For post hoc evaluation, Bonferroni corrected Wilcoxon Signed Rank test was performed. No specific procedure was defined for missing data. Data were expressed as mean ยฑ standard deviation (SD), median (inter-quartile range, IQR) and n (%), where appropriate. p < 0.05 was considered statistically significant.
Results
Patient demographics and comorbidities
Of the 85 patients who began galcanezumab treatment, 54 fully met the study criteria by completing the series of galcanezumab injections over 3โmonths, filling out PROMs without missing data, and were included in statistical analysis. Within the EM group, 24 patients, were categorized into high-frequency EM (HFEM) with 9โ14 headache days per month for 12 patients, and low-frequency EM (LFEM) with 4โ8 headache days per month for the remaining 12 patients. The CM group comprised 30 patients who experienced 15 or more headache days per month, with at least 8โdays meeting the criteria for migraine with or without aura.
The mean age of the patients was 38.3 years (SD 10.1, range 33.5 to 44.0 years), with females constituting 90.7% (n = 49) of the study population. Most of patients were university graduates (77.8%) and employed (74.1%), while a family history for migraine was evident in 68.5% of patients Notably, 46.7% (n = 14) of the patients with CM also presented with medication overuse headache (MOH). Furthermore, comorbidities were identified, with 40.4% (n = 21) of patients having a sleep disorder, 36.5% (n = 19) having a psychiatric disease, and 26.9% (n = 14) having a gastrointestinal disease (Table 1).
| Age (year), mean(SD) | 38.3(10.1) |
| Gender,(%)n | |
| Female | 49(90.7) |
| Male | 5(9.3) |
| Educational status,(%)n | |
| Primary school | 2(3.7) |
| High school | 10(18.5) |
| University | 42(77.8) |
| Employment,(%)n | |
| Unemployed | 14(25.9) |
| Employed | 40(74.1) |
| Family history for migraine, n(%) | 37(68.5) |
| Body mass index (kg/m), mean(SD)2 | 22.9(3.9) |
| Comorbid diseases,(%)n | |
| Sleep disorder | 21(40.4) |
| Psychiatric disease | 19(36.5) |
| Gastric disease | 14(26.9) |
| Type of migraine,(%)n | |
| Chronic migraine | 30(55.6) |
| Episodic migraine | 24(44.4) |
| HFEM | 12(22.2) |
| LFEM | 12(22.2) |
| Duration of migraine (years), mean(SD) | 16.4(9.5) |
| Analgesic use, days, mean(SD) | |
| Migraine non-specific | 10.4(10.5) |
| Migraine specific | 6.5(6.8) |
| Previous treatments,(%)n | |
| OnabotulinumtoxinA | 13(24.1) |
| Antiepileptics | 8(14.8) |
| Nerve blocks | 7(13) |
| SSRI, SNRI | 5(9.3) |
| CGRP monoclonal antibodies | 2(3.7) |
| Other | 4(7.4) |
Sleep quality
The total PSQI scores for all patients were as follows: median (IQR) 6 (4โ11) at baseline. In the subgroups, LFEM had a median (IQR) score of 4.5 (3.7โ10), HFEM had a median (IQR) score of 5 (4โ6), and CM had a median (IQR) score of 8.5 (6โ11.7) at baseline. The percentage of patients with poor sleep quality (total PSQI scores โฅ 5) was 72.7% at baseline, decreasing to 57.5% and 56.2% at the 1st and 2nd months, respectively (data not shown).
By the 3rd month of galcanezumab injections, significant improvement was observed in the sleep disturbances domain in the overall study population (p = 0.016), and in subgroups of patients with low anxiety levels (p = 0.016) and none/minimal depression (p = 0.035) at baseline (Table 2).
Patients with sleep disorder at baseline exhibited marked improvements in total PSQI scores (p = 0.027) and in the subjective sleep quality (p = 0.034) and daytime dysfunction (p = 0.013) domains by the 3rd month (Table 2).
Moreover, there was no important difference documented between the chronic migraine (CM) and episodic migraine (EM) groups (total, LFEM, and HFEM) concerning the change from baseline to the 3rd month in PSQI total and domain scores (Table 3).
| PSQI scores, median (IQR) | Baseline | 3rd month | -valuep |
|---|---|---|---|
| All patients (=โ54)n | |||
| Total score | 6(4.5โ13) | 5(3โ9) | 0.106 |
| Subjective sleep quality | 1(1โ2) | 1(1โ2) | 0.182 |
| Sleep latency | 2(1โ2) | 2(1โ2) | 0.898 |
| Sleep duration | 1(0โ1) | 1(0โ1) | 0.643 |
| Habitual sleep efficiency | 0(0โ1) | 0(0โ0) | 0.358 |
| Sleep disturbances | 2 (1โ2) | 1(1โ2) | 0.016 |
| Use of sleep medications | 2(0โ2.3) | 0(0โ1.3) | 0.26 |
| Daytime dysfunction | 1(0โ2) | 0(0โ2) | 0.108 |
| Patients with sleep disorder at baseline (=โ21)n | |||
| Total score | 8.5(4.3โ14.8) | 7.5(3.5โ9.8) | 0.027 |
| Subjective sleep quality | 2 (1โ2.3) | 1.5(1โ2) | 0.034 |
| Sleep latency | 2(1โ3) | 2(1โ3) | 0.084 |
| Sleep duration | 0(0โ1.5) | 1(0โ1.5) | 0.38 |
| Habitual sleep efficiency | 0(0โ1) | 0(0โ0.1) | 1 |
| Sleep disturbances | 2(1โ2) | 1(1โ2) | 0.059 |
| Use of sleep medications | 2(0โ3) | 0.5(0โ3) | 0.131 |
| Daytime dysfunction | 1.5(1โ3) | 1.5(0โ2.3) | 0.013 |
| Patients with low BAI scores at baseline (=โ40)n | |||
| Total score | 6(4โ9.5) | 5(3โ8.5) | 0.106 |
| Subjective sleep quality | 1(1โ2) | 1(1โ2) | 0.182 |
| Sleep latency | 2(1โ2) | 2(1โ2) | 0.898 |
| Sleep duration | 1(0โ1.5) | 1(0โ1) | 0.643 |
| Habitual sleep efficiency | 0(0โ0) | 0(0โ1) | 0.358 |
| Sleep disturbances | 2(1โ2) | 1(1โ1) | 0.016 |
| Use of sleep medications | 0(0โ0.5) | 0(0โ0.3) | 0.26 |
| Daytime dysfunction | 1(0โ2) | 0(0โ2) | 0.108 |
| Patients with none/minimal BDI scores at baseline (=โ24)n | |||
| Total score | 5(4โ9) | 4.5(3โ7.3) | 0.093 |
| Subjective sleep quality | 1(1โ2) | 1(1โ1) | 0.083 |
| Sleep latency | 1(1โ2) | 2(1โ2) | 0.48 |
| Sleep duration | 0.5(0โ1) | 1(0โ1) | 1 |
| Habitual sleep efficiency | 0(0โ1) | 0(0โ0) | 0.829 |
| Sleep disturbances | 1(1โ2) | 1(1โ1) | 0.035 |
| Use of sleep medications | 0(0โ0) | 0(0โ0) | 0.564 |
| Daytime dysfunction | 1(0โ1) | 0(0โ1) | 0.09 |
| Change from baseline to 3rd month | Chronic migraine (CM) | Episodic migraine | -valuep | |||
|---|---|---|---|---|---|---|
| All patients (A) | LFEM (B) | HFEM (C) | CM vs. A1 | CM vs. B and C2 | ||
| (=โ30)n | (=โ54)n | (=โ12)n | (=โ12)n | |||
| PSQI scores | ||||||
| Total score | โ1(โ4โ2) | 0(โ2โ1.5) | โ1(โ5.3โ1) | 0.5(โ1.8โ3.8) | 0.271 | 0.191 |
| Subjective sleep quality | 0(โ1โ0) | 0(0โ0) | 0(โ5โ0) | 0(0โ5) | 0.402 | 0.42 |
| Sleep latency | 0(โ0.8โ1) | 0(0โ0) | 0(โ5โ0) | 0(0โ0) | 0.571 | 0.777 |
| Sleep duration | 0(โ1โ0) | 0(0โ1) | 0(0โ1) | 0(0โ0.8) | 0.09 | 0.186 |
| Habitual sleep efficiency | 0(โ1โ0) | 0(0โ0) | 0(0โ0) | 0(0โ0) | 0.305 | 0.367 |
| Sleep disturbances | 0(โ1โ0) | 0(โ1โ0) | โ0.5(โ1.3โ0) | 0(โ0.5โ0) | 0.849 | 0.38 |
| Use of sleep medications | 0(0โ0) | 0(0โ0) | 0(0โ0) | 0(0โ0) | 0.471 | 0.771 |
| Daytime dysfunction | 0(โ1โ0) | 0(โ1โ0) | 0(โ1โ0) | 0(โ0.5โ1) | 0.617 | 0.652 |
Migraine outcome
Galcanezumab demonstrated marked improvement in migraine outcomes from baseline to the 1st, 2nd, and 3rd months, as indicated by the median (IQR) values:
Migraine outcome in terms of monthly headache days, monthly migraine days, and headache severity, at baseline and follow-up visits.
Headache impact and migraine-related disability
HIT-6 scores exhibited a baseline value of 67 (65โ70) and significantly decreased to 58 (50โ62), 57 (48โ62), and 56 (49โ63) at the 1st, 2nd, and 3rd month visits, respectively (p < 0.001 for each). Additionally, MIDAS scores demonstrated marked improvement from baseline to the 3rd month, decreasing from 50 (0โ180) to 9 (0โ70) (p < 0.001) (Table 4).
| PROMs, median (IQR) (=โ54)n | Baseline (A) | 1st month (B) | 2nd month (C) | 3rd month (D) | -valuep1 | |
|---|---|---|---|---|---|---|
| MIDAS score | 50(0โ180) | - | - | 9(0โ70) | <0.0012 | |
| HIT-6 score | 67(65โ70) | 58(50โ62) | 57(48โ62) | 56(49โ63) | <0.001 | |
| SF36 HRQoL, median (IQR) | ||||||
| Physical functioning | 85(63.8โ90) | 85(62.5โ100) | 85(75โ100) | 95(65โ100) | <0.001 | |
| Role-physical | 0(0โ100) | 100(25โ100) | 100(50โ100) | 100(25โ100) | <0.001 | |
| Role-emotional | 33.3(0โ100) | 100(41.7โ100) | 100(75โ100) | 100(100โ100) | <0.001 | |
| Vitality | 45(35โ55) | 70(50โ70) | 65(55โ72.5) | 60(47.5โ80) | 0.003 | |
| Mental health | 56(40โ76) | 76(64โ88) | 76(58โ82) | 80(56โ88) | <0.001 | |
| Social functioning | 50(25โ75) | 87.5(62.5โ100) | 87.5(75โ100) | 87.5(75โ100) | <0.001 | |
| Bodily pain | 35(20โ45) | 67.5(55โ90) | 67.5(45โ77.5) | 67.5(45โ90) | <0.001 | |
| General health | 53.3โยฑโ26.7 | 67.1โยฑโ21.9 | 65.4โยฑโ21.5 | 66.9โยฑโ23.7 | <0.001 | |
| BAI score, median (IQR) | 9(4โ22.5) | 6(3โ11.5) | 5(2โ12) | 5(1โ13.5) | <0.001 | |
| BDI score, median (IQR) | 8(3.5โ17.5) | 4(1โ9.5) | 3(0โ8) | 4(0.5โ9.5) | <0.001 | |
| comparisonsPost hoc2 | ||||||
| A vs. B | A vs. C | A vs. D | B vs. C | B vs. D | C vs. D | |
| HIT-6 score | <0.001 | <0.001 | <0.001 | 1 | 0.77 | 1 |
| SF36 HRQoL | ||||||
| Physical functioning | 0.446 | 0.022 | 0.001 | 1 | 0.291 | 1 |
| Role-physical | 0.041 | 0.03 | 0.01 | 1 | 1 | 1 |
| Role-emotional | 0.156 | 0.03 | 0.012 | 1 | 1 | 1 |
| Vitality | 0.148 | 0.019 | 0.011 | 1 | 1 | 1 |
| Mental health | 0.026 | 0.003 | 0.002 | 1 | 1 | 1 |
| Social functioning | 0.019 | 0.005 | 0.004 | 1 | 1 | 1 |
| Bodily pain | 0.001 | <0.001 | <0.001 | 1 | 1 | 1 |
| General health | 0.037 | 0.001 | 0.001 | 1 | 1 | 1 |
| BAI | 0.001 | <0.001 | 0.001 | 0.523 | 1 | 1 |
| BDI | 0.048 | <0.001 | <0.001 | 0.742 | 0.295 | 1 |
HRQoL and emotional state
In comparison to baseline values, galcanezumab treatment led to significant improvement in each domain of SF-36 HRQoL at the 2nd month (p ranged 0.019 to <0.001) and 3rd month (p ranged 0.012 to <0.001). Notably, improvements were observed in all domains, except for physical functioning, role-emotional, and vitality, at the 1st month (Table 4).
From baseline to the 1st, 2nd, and 3rd month visits, the median (IQR) BAI scores showed an important decrease, decreasing from 9 (4โ22.5) to 6 (3โ11.5), 5 (2-12), and 5 (1โ13.5), respectively (p < 0.001 for each). Similarly, the BDI scores also significantly decreased from 8 (3.5โ17.5) at baseline to 4 (1โ9.5), 3 (0โ8), and 4 (0.5โ9.5) at the 1st, 2nd, and 3rd month visits, respectively (p = 0.048, p < 0.001, and p < 0.001, respectively).
Notably, BDI scores indicated none or minimal depressive symptoms in 45.3% of patients at baseline, increasing to 77.6, 78.7, and 73.9% at the 1st, 2nd, and 3rd month follow-ups, respectively. Regarding anxiety, 24.5% of patients reported moderate-to-severe symptoms at baseline, which decreased to 10.2%, 8.6%, and 13.0% at the 1st, 2nd, and 3rd month follow-ups, respectively (Table 4; Figure 2).
No meaningful differences were observed between the 1st to 3rd month follow-up visits in terms of HRQoL and emotional state (Table 4).
Patient-reported outcome measures for anxiety (BAI scores) and depression (BDI scores), at baseline and follow-up visits.
Response to galcanezumab treatment
Median (IQR) response rates, represented as the percentage reduction in MHDs, were 75% (90โ100%), 92.5% (80โ100%), and 92.5% (80โ100%) at the 1st, 2nd, and 3rd months, respectively. There were 34 patients (63%) in this cohort who showed a 50% or greater reduction in MHDs. Galcanezumab treatment was deemed effective or very effective by the majority of patients and physicians at each visit: 83.6% and 84.1% at the 1st month, 87.7% and 93.4% at the 2nd month, and 85.4% and 89.7% at the 3rd month. Only 2 (4.1%) patients considered galcanezumab not effective at the 1st month, and none of the patients or physicians regarded it as ineffective at the 3rd month.
Safety data
No reportable safety concerns were recorded in our cohort. Considering the TEAEs reported at the 1st, 2nd, and 3rd month visits, constipation was reported in 8 (16.7%), 10 (19.6%), and 9 (17.3%) patients, respectively. Pain at the injection site was noted in 5 (10.4%), 4 (7.8%), and 8 (15.4%) patients, respectively. Nausea was absent in the 1st month, then it was reported by 4 (7.8%) patients in the 2nd month, and by 3 (5.8%) patients in the 3rd month. None of the patients reported elevated blood pressure, diarrhea, or weight loss during the follow-up visits (Table 5).
| After first injection | After second injection | After third injection | |
|---|---|---|---|
| Adverse events,(%)n | |||
| Constipation | 8 (16.7) | 10(19.6) | 9(17.3) |
| Pain at injection site | 5(10.4) | 4(7.8) | 8(15.4) |
| Hair loss | 1(2.1) | 2(3.9) | 1(1.9) |
| Worsening in headache | 1 (2.1) | 1(2) | 1(1.9) |
| Nausea | 0 | 4(7.8) | 3(5.8) |
| Allergic reaction | 0 | 3(5.9) | 2(3.8) |
| Weight gain | 0 | 2(3.9) | 2(3.8) |
| Cold, flu | 0 | 1(2.0) | 1(1.9) |
| Anxiety, depression | 0 | 1(2.0) | 2(3.8) |
| Generalized muscle ache | 0 | 1(2.0) | 1(1.9) |
| Joint pain | 0 | 0 | 1(1.9) |
| Weight loss | 0 | 0 | 0 |
| Diarrhea | 0 | 0 | 0 |
| Elevated blood pressure | 0 | 0 | 0 |
| Other* | 5(10.4) | 7(13.7) | 10(19.2) |
Discussion
This real-world study, conducted in patients with EM and CM who had prevalent comorbidities such as sleep disorders and psychiatric problems, demonstrated that galcanezumab treatment was associated with a rapid onset and significant improvement in migraine outcomes. This amelioration included a reduction in MHDs, MMDs, and headache severity. Beyond addressing pain-related parameters, galcanezumab also proved to be effective in enhancing sleep quality in the overall study population, with the decrease in the percentage of patients reporting poor sleep quality (total PSQI scores โฅ 5) by nearly 20% from baseline to the 1st and 2nd months. Besides the overall improvement in sleep quality, galcanezumab specifically improved the total PSQI scores along with the subjective sleep quality and daytime dysfunction domains within a 3-month treatment period in the subgroup of patients with sleep disorder at baseline, and the sleep disturbances domain particularly in patients without baseline depression or anxiety. Moreover, various PROMs, such as HIT-6, MIDAS, and SF-36 HRQoL, as well as BDI and BAI, were rapidly improved following the series of galcanezumab injections. These findings collectively highlight the multifaceted positive impact of galcanezumab on both migraine-related and psychological aspects, emphasizing its potential as an effective therapeutic option in individuals with comorbidities in a real-world clinical setting.
The effect of galcanezumab on sleep parameters in our migraineurs appeared to be a comorbidity-based and domain-specific effect, which involved sleep disturbances domain in patients without depression or anxiety at baseline but the total PSQI scores, subjective sleep quality and daytime dysfunction in those with sleep disorder at baseline.
It is worth noting that, in another real-world study involving galcanezumab in patients with EM and CM, no change in sleep quality, as assessed by the Medical Outcomes Study sleep scale, was observed from baseline after the third and sixth administrations (18). These findings underscore the potential variability in treatment responses and outcomes across different populations and measurement scales in real-world settings.
In a study involving patients with EM and CM receiving erenumab, fremanezumab, or galcanezumab, the PSQI showed a significant reduction from baseline to the 3rd month. However, it did not reach the cut-off of <5 for good sleep quality (32). The study suggests that a more prolonged treatment duration of 6โ12 months with erenumab, fremanezumab, or galcanezumab may be required for substantial improvement in sleep quality, especially in CM patients. Additionally, the use of objective measures of sleep quality, such as polysomnography, may reveal positive outcomes even after 3 months of treatment (33, 34). These findings imply the potential for galcanezumab to improve sleep abnormalities over longer treatment periods. The suggestion for further investigation based on objective measures of sleep quality, such as polysomnography, indicates the need for more comprehensive and precise data on sleep parameters in patients undergoing preventive migraine treatments (18).
Although the precise mechanisms are still unclear, CGRP seems to have a role in regulating sleep and arousal. Glutamatergic neurons in the external lateral parabrachial nucleus of the mice, particularly those expressing CGRP, may play a vital role in the arousal response to elevated CO2 or hypoxia. Selective inhibition of these neurons stops waking up in response to CO2 (35). In mouse models with neuropathic pain, preventing sleep fragmentation was achieved by genetically silencing peripheral sensory neurons or ablating CGRP-positive neurons in the parabrachial nucleus (36). CGRP impacts pathways to thalamic trigeminovascular neurons, possibly affecting pain sensitivity in primary headaches during conditions like sleep deprivation (37).
The improvements in sleep parameters (total scores, subjective sleep quality and daytime dysfunction) in the subgroup of patients with baseline sleep disorder is notable given that this group accounts for 40% of the overall study population. The improvement in daytime dysfunction seems to be particularly important since the excessive daytime sleepiness was considered to have a stronger association with the migraine-related disability, compared to other sleep disturbances (i.e., deteriorated sleep quality or increased sleep apnea risk) in patients with CM (38).
Another important finding of the present study seems to be the marked improvement in sleep disturbances domain from baseline to the 3rd month in subgroups of patients with low anxiety and none/minimal depression at baseline. These findings seem notable given the complex association of sleep disturbance with depression, which may precede or follow the onset and recurrence of depression, and the likelihood of individuals with depressive symptoms to suffer from a greater burden of comorbid anxiety symptoms in case of comorbid sleep disturbance (39). Indeed, the sleep disturbance is considered an acute headache trigger for migraine and an independent risk factor for progression from episodic to chronic headache (40). Hence, our findings emphasize that migraine patients without anxiety and/or depression may effectively benefit from galcanezumab, particularly in terms of improving sleep problems through the amelioration of migraine outcomes. However, in those with comorbid anxiety and depression, the improved migraine outcome alone, without addressing the management of psychiatric disorders, may not be sufficient to effectively improve sleep problems.
Some studies reported the association of CM, compared to EM, with higher PSQI scores (worse subjective sleep quality) and higher prevalence of excessive daytime sleepiness and depressive and anxiety symptoms (13, 41, 42). Notably, while our CM and EM patients had similar change from baseline to 3rd month for PSQI total and domain scores, the sleep disturbances domain was particularly improved after galcanezumab treatment in subgroups of patients with low anxiety and none/minimal depression at baseline. Hence, while galcanezumab was effective in ameliorating depressive and anxiety symptoms, its potential to improve sleep disturbances seems to be more prominent in patients without depression or anxiety at baseline. These findings seem to support that in some migraineurs, there is no reciprocal association between negative emotional states and poor sleep quality (43โ45).
The observed amelioration in MHDs and MMDs in our current study aligns with other real-world studies on galcanezumab, indicating a more extensive improvement in MHDs and MMDs than reported in randomized controlled trials RCTs (18, 46โ48). Notably, in both CM and EM patients, the correlation between MMDs and scores on the MIDAS and the HIT-6 was reported to be stronger during galcanezumab treatment than their correlation recorded at baseline. This emphasizes the presence of treatment benefits extending beyond headache frequency to encompass more subtle aspects of the disease (46, 49, 50).
In our patient population, significant improvements were not only observed in migraine outcome parameters but also in several PROMs linked to migraine-related impairment in functioning. These include substantial improvements in HIT-6 and MIDAS scores, in addition to critical enhancements in SF-36 HRQoL scores. Furthermore, there was a noteworthy enhancement in all domains of HRQoL measured by the SF-36 in galcanezumab-treated patients with both EM and CM. These findings suggest the potential of galcanezumab to alleviate the existing disease burden and improve HRQoL in migraine patients, with implications for increased capabilities in work and daily activities, heightened productivity, and enhanced emotional well-being (51, 52).
Other real-world studies also indicated that monthly prophylactic treatment with galcanezumab was effective in both CM and EM, especially in reducing migraine burden and disability with significant improvements in several PROMs, including HIT-6, MIDAS, and MSQ (18, 46). In this study, the median MIDAS scores started at 50.0 at baseline, then decreased to 9.0 by the 3rd month, indicating a shift from โsevere disabilityโ to โlittle or no/mildโ disability. Also, median HIT-6 scores were 67.0 at baseline and ranged from 56 to 58 after galcanezumab treatment, suggesting amelioration from โsevere impactโ to โsubstantial impact.โ Nonetheless, while the three-month follow-up provides initial insights, extending this to 6โ12 months could offer a better understanding of the long-term effects and sustainability of treatment benefits.
PROMs, reflecting the patientโs perspective and experience, are increasingly used in clinical practice to improve patient-centered care, patient engagement, and shared decision-making (53). Nonetheless, while the disability assessment tools widely used in headache research such as MIDAS and HIT-6 are useful as outcome measures, individually they cannot capture the entire experience of headache disability (54). Also, PROMs measures differ with respect to their ability to capture treatment efficacy from a patientโs perspective and to reliably indicate a patientโs real clinical improvement (54, 55). In this regard, the use of multimodal PROMs that assess migraine as well as comorbidities and QoL in our study seems to strengthen our findings, enabling a concomitant evaluation of several individual variables and a more comprehensive picture of treatment outcomes related to improvement in several domains besides the headache (54, 55).
Disability in migraine patients is a multifaceted phenomenon influenced by personal functioning and the psychological burden of the disease, in addition to the number of headache days (46). In our patient cohort, BDI and BAI scores showed significant improvement following the galcanezumab loading dose, and this effect was sustained throughout the subsequent injection series. Similarly, in another real-world study involving a cohort of 43 patients with HFEM and CM, galcanezumab treatment was associated with improved Migraine-Specific Quality of Life scores and a reduction in depressive symptoms and anxiety (18). The ability of galcanezumab to rapidly alleviate depressive and anxious symptoms is particularly notable, considering that both depression and anxiety are recognized as risk factors for migraine chronification, associated with decreased treatment response, impaired quality of life, and increased overall disease burden (18, 43, 56).
Itโs worth noting that almost ~80% of our patients had comorbid sleep disorders or psychiatric diseases before galcanezumab treatment. This suggests that galcanezumab may be a favorable therapeutic option in migraine patients with a considerable burden of comorbidities. In a real-world study with CM patients, the response rate to galcanezumab was 64.3%, with daily headache, the presence of depression, and absence of accompanying symptoms of migraine identified as significant predictors of a poor response to galcanezumab treatment (57). In a post hoc analysis of the REGAIN and pooled EVOLVE-1 and EVOLVE-2 studies, a medical history of anxiety and/or depression was reported to interfere with the response to galcanezumab in patients with CM, decreasing the likelihood of a reduction in overall MHD and functional improvement in those with comorbid anxiety and/or depression (58).
The majority of our patients and physicians considered galcanezumab to be effective or very effective at each visit, and the reported TEAEs in our cohort were consistent with the well-known high safety and tolerability profile of galcanezumab (16, 18). In this context, our findings support the notion that the high tolerability of galcanezumab, facilitated by its monthly administration and sustained effectiveness, establishes a significant foundation for improved adherence and, ultimately, enhanced outcomes in patients with both EM and CM (52, 59).
This study has several limitations that should be acknowledged. Firstly, the single-center design with a limited number of participants may raise concerns about the generalizability of the findings, potentially limiting the external validity. Secondly, the analysis of data on negative emotional states and sleep quality relied on self-reported measures using PROMs rather than face-to-face psychiatric evaluations. This method may not fully capture the complexity of emotional and sleep-related conditions. Thirdly, the relatively short 3-month follow-up period might have limitations in capturing the long-term response to galcanezumab and monitoring potential risks associated with the treatment. An extended follow-up duration could provide a more comprehensive understanding of the treatmentโs efficacy and safety profile over time. The association of continued treatment beyond 3 months with a likely delayed response in non-responders is recognized in the literature (43). Fourthly, absence of a control group in this real-life data is another limitation, given that inclusion of a control group for comparison would strengthen the conclusions drawn about galcanezumabโs effectiveness against standard care or placebo.
Conclusion
In conclusion, this real-world study indicates the likelihood of galcanezumab to be a promising and effective emerging agent for migraine prophylaxis, offering not only reduced headache days but also reduced migraine disability and improved functionality and negative emotional states. Galcanezumab demonstrates notable benefits in improving sleep quality, along with a comorbidity-based and domain-specific effect on sleep parameters, which involved sleep disturbances domain in patients without depression or anxiety at baseline but the total PSQI scores, subjective sleep quality and daytime dysfunction in those with sleep disorder at baseline. Given the improved sleep parameters in galcanezumab-treated CM and EM patients within 3-months treatment, the real potential of galcanezumab on improved sleep problems may appear in the longer term. Nonetheless, its effectiveness in population of migraineurs suffering from either comorbid sleep disorder or psychiatric disease seem to indicate the likelihood of galcanezumab to be a favorable therapeutic option in migraine patients with comorbidities. There is a need for real-world studies with longer follow-up periods assessing galcanezumabโs effectiveness against standard care or placebo to better understand effectiveness and safety profile of galcanezumab and to optimize the positioning of this new drug within the current migraine prophylaxis practice.
Data availability statement
The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author.
Ethics statement
This study was conducted in accordance with the ethical principles stated in the โDeclaration of Helsinkiโ and approved by Acibadem University School of Medicine Medical Research Ethics Committee (Approval number: 2023-20/671). The participants provided their written informed consent to participate in this study.
Author contributions
EI: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Writing โ original draft, Writing โ review & editing. TE: Data curation, Formal analysis, Investigation, Writing โ review & editing. PY: Data curation, Formal analysis, Investigation, Supervision, Writing โ review & editing.