Deterioration of headache impact and health-related quality of life in migraine patients after cessation of preventive treatment with CGRP(−receptor) antibodies
The Journal of Headache and Pain volume 22, Article number: 158 (2021)
Migraine preventive treatment with CGRP(−receptor) monoclonal antibodies (mAbs) has a positive effect on patients’ health-related quality of life (HRQoL). The German treatment guidelines recommend discontinuing successful treatment with CGRP(−receptor) mAbs after 6–12 months. We aimed to evaluate headache-specific and generic HRQoL for three months after discontinuation of CGRP(−receptor) mAb treatment.
We conducted a prospective, longitudinal cohort study, including patients with migraine after 8–12 months of therapy with a CGRP(−R) mAb and before a planned discontinuation attempt. HRQoL was assessed at the time of the last mAbs injection (V1), eight weeks later (V2), and sixteen weeks later (V3). For headache-specific HRQoL, we used the Headache Impact Test-6 (HIT-6). Generic HRQoL was determined with the EuroQol-5-Dimension-5-Level (ED-5D-5L) form, and the Short-Form 12 (SF-12), which comprises a Physical Component Summary (PCS-12) and a Mental Component Summary (MCS-12).
Questionnaires’ total scores were compared across the three observation points using nonparametric procedures.
The study cohort consisted of n = 61 patients (n = 29 treated with the CGRP-receptor mAb erenumab and n = 32 with the CGRP mAbs galcanezumab or fremanezumab). The HIT-6 sum score was 59.69 ± 6.90 at V1 and increased by 3.69 ± 6.21 at V3 (p < 0.001), indicating a greater headache impact on patients’ lives. The mean total EQ-D5-L5 score declined from 0.85 ± 0.17 at V1 by − 0.07 ± 0.18 at V3 (p = 0.013). Both Mental and Physical Component Scores of the SF-12 worsened significantly during treatment discontinuation: The PCS-12 total score decreased by − 4.04 ± 7.90 from V1 to V3 (p = 0.013) and the MCS-12 score by − 2.73 ± 9.04 (p = 0.003). Changes in all questionnaires’ scores but the MCS-12 were already significant in the first month of the drug holiday (V2).
Our results show a significant decline in headache impact and generic HRQoL of migraine patients after treatment discontinuation of a CGRP(−R) mAb. The observed deterioration is above the established minimally clinically important differences for each of the questionnaires and can therefore be considered clinically meaningful. Monitoring HRQoL during a discontinuation attempt could facilitate the decision whether or not to resume preventive treatment with CGRP(−R) mAbs.
Migraine is a disabling disease, which can require prophylactic treatment . The monoclonal antibodies (mAbs) erenumab, galcanezumab and fremanezumab are safe and efficient migraine preventive drugs. They interfere with the calcitonin-gene related peptide (CGRP) pathway to prevent migraine but differ in their exact target. While erenumab targets the CGRP-receptor (CGRP-R), galcanezumab and fremanezumab target the CGRP peptide [2, 3].
In addition to the reduction of migraine frequency and acute medication use, CGRP(−R) mAbs reduce migraine-related disability and increase the quality of life of migraine patients in placebo-controlled randomized clinical trials [4,5,6,7,8,9,10,11,12,13,14]. These observations could be confirmed in real-world studies [15, 16].
Treatment guidelines of the German Migraine and Headache Society (Deutsche Migräne- und Kopfschmerzgesellschaft, DMKG) and the European Headache Federation (EHF) recommend a treatment pause after 6–12 months of successful prophylactic therapy in order to reassess the treatment need [17, 18]. Recent real-world studies describe a worsening of migraine after the discontinuation of CGRP(−R) mAbs [19, 20]. We reported a significant increase in monthly migraine days (MMD) already one month after the discontinuation of CGRP(−R) mAb therapy with a return to baseline levels after three months . To date, no real-world data about health-related quality of life (HRQoL) after the cessation of mAb therapy exists.
HRQoL gained importance in recent years as an outcome in clinical trials for migraine prophylaxis [22,23,24,25]. Both headache-specific questionnaires, such as the Headache Impact Test 6 (HIT-6), and generic questionnaires, e.g. the Short Form 12 (SF-12), are recommended to assess HRQoL in migraine patients [24, 25].
Migraine day frequency correlates negatively with HRQoL . However, the burden of migraine on patients is influenced by a host of factors . During the attack-free time, patients’ lives are affected by the fear of the next attack, avoidance of certain activities, and social stigmatization [28, 29]. A focus only on MMD or acute medication use during a discontinuation attempt could be misleading. The assessment of HRQoL changes over time can help to determine the treatment need, which may lead to the resumption of CGRP(−R) mAbs prophylaxis. We therefore studied headache-specific and generic HRQoL changes after a discontinuation attempt of CGRP(−R) prophylactic therapy.
Study design and population
The design of this longitudinal, prospective cohort study has been published in detail elsewhere . In brief, eligible patients were adults with migraine under prophylactic therapy with a CGRP(−R) mAb for at least eight months. All patients were scheduled for a discontinuation attempt, in accordance with the European Headache Federation (EHF) and German treatment guidelines [17, 18]. Patients were on their first CGRP(−R) mAb and had no other concomitant prophylactic medication. We included patients with episodic (EM) and chronic migraine (CM). The diagnosis of migraine was based on the ICHD3-criteria during the year prior to mAb treatment initiation .
All patients who met these criteria between January 2020 and December 2020 were asked to participate in the study.
For this analysis, we separated the patients into two groups: 1) patients who received the CGRP-R mAb erenumab (70 or 140 mg subcutaneous (s.c.) per month; receptor group), and 2) patients who received the CGRP mAb galcanezumab (240 mg s.c. loading dose, 120 mg s.c. monthly) or fremanezumab (225 mg s.c. per month; ligand group).
The study had a duration of 16 weeks and consisted of three consecutive study visits (V1–3). V1 was performed at the time of the last mAb injection. The second visit (V2) was scheduled eight weeks and the third visit (V3) 16 weeks after the last mAb injection.
At each visit, we recorded headache data of the previous month . Additionally, the patients completed the following HRQoL questionnaires: The HIT-6, the SF-12, including its Physical Component Summary (PCS-12), and Mental Component Summary (MCS-12), and the EuroQol-5-Dimension-5-Level (EQ-5D-5L) form.
At V1 and V3, patients documented data in the questionnaires independently on-site, while study staff was available for questions. V2 was performed over the phone and the questionnaires were sent to the patients via mail. We confirmed that patients filled out and sent back the questionnaires within one week. Questionnaires were immediately checked for completeness to avoid missing items.
Headache-impact-test 6 (HIT-6)
The HIT-6 is a 6-item tool to measure headache impact on a patient’s life during the previous four weeks . It takes six dimensions into account: pain, social functioning, role functioning, vitality, cognitive functioning, and psychological distress . Each item is answered on a 5-point Likert scale as follows: “never” (6 points), “rarely” (8 points), “sometimes” (10 points), “very often” (11 points), and “always” (13 points).
The total HIT-6 score ranges from 36 to 78 points. Scores can be ranked into four categories depending on the headache impact on the patient’s life. HIT-6 scores 36–49 indicate little-to-no impact, 50–55 moderate impact, 56–59 substantial impact, and 60–78 severe impact .
The EQ-5D-5L assesses patients’ HRQoL on the exact day they are filling out the questionnaire. It allows calculating one single score for patients’ general HRQoL, taking five domains into account: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression . The patients can state the severity grade in every domain as follows: no problems, slight problems, moderate problems, severe problems, ‘unable to’/extreme problems .
A response pattern indicating no problems in any of these areas translates to an EQ-5D-5L index score of 1.00. Representative German population samples have shown a mean index score of 0.88 ± 0.18 .
Short form 12 (SF-12)
The SF-12 comprises 12 questions and aims to measure patients’ HRQoL with two scores: the Mental Component Summary (MCS-12) and the Physical Component Summary (PCS-12). The MCS-12 includes questions assessing the patient’s vitality, social functioning, emotional role fulfillment, and mental health. The Physical Component Summary (PCS-12) assesses physical functioning, physical role fulfillment, bodily pain, and general health [33, 34]. The questions refer to the respondent’s condition within the last four weeks. The German average in the SF-12 validation study was 49.60 ± 8.70 for the PCS-12 and 52.30 ± 8.00 for the MCS-12 . Due to the homogeneity of our study population in terms of sex and age, we used the primary scores for the German population as reference values.
Higher PCS and MCS values indicate a better HRQoL.
Outcomes of the study were the questionnaires’ total scores at each study visit. Primary endpoint was the change in the HIT-6 sum scores across the four-month observation period. Secondary endpoints were the changes in the EQ-5D-5L and SF-12 scores as well as the score changes within the two study groups over all study visits.
In a subgroup analysis, we assessed the changes in questionnaires’ total scores between V1 and V3 in patients who did not experience a clinically relevant worsening of MMD in this period. We defined a 30% or higher worsening as clinically relevant following international guidelines for trials of prophylactic treatment in chronic migraine .
We used SPSS 27 (IBM, NY, USA) to perform all statistical analyses. Descriptive statistics were performed to assess demographic and anamnestic data using mean ± standard deviation for numeric variables, and absolute and percentage frequencies for categorical variables. Outcomes were tested for normal distribution using the Kolmogorov-Smirnov test. Because this test revealed a non-normal distribution, we used the following non-parametric tests: the Friedman test with post-hoc pairwise comparisons for dependent samples or the Mann-Whitney U test for independent samples.
A two-tailed p-value < 0.05 was considered statistically significant. P-values were adjusted for multiple comparisons using the Bonferroni method.
The study was approved by the Charité Ethical Committee (EA1/274/19). All participants gave written informed consent after they received adequate study information.
Demographics and patients’ characteristics
Between January 2020 and December 2020, n = 65 patients met the criteria for study inclusion, and n = 63 (96.9%) agreed to participate. A total of n = 61 patients (n = 29 receptor group and n = 32 ligand group) provided complete data sets.
Demographic and anamnestic data were evenly distributed between the groups (Table 1, p > 0.28, n.s.). Demographic characteristics of the cohort and the evolution of headache days have been published in detail elsewhere .
Migraine evolution after treatment discontinuation
MMDs increased from 8.59 ± 6.60 at V1 to 12.84 ± 6.86 in the fourth month after cessation of therapy (V3). This represents an increase to a similar MMD level as before mAb therapy initiation, which was 13.52 ± 6.34.
Significantly more patients with the initial diagnosis of CM prior to mAb treatment met the criteria for CM also at V3 (57.5% of patients with prior CM vs. 21.7% of patients with prior EM, p = 0.012 as measured with chi-squared test).
The subgroup of patients with a less than 30% increase of MMD between V1 and V3 consisted of n = 26 women (42.6%) with an age of 50.92 ± 12.73 years. Most of them had chronic migraine (n = 17, 65.4%) with an average of 14.54 ± 7.03 MMD prior to treatment begin.
Changes headache impact
Over half of patients (n = 34, 54.1%) reported a worsening of ≥2.5 points and over one-third (n = 23, 37.7%) a worsening of ≥6 points from V1 to V3.
Subgroup analyses revealed a worsening in both the receptor and the ligand group over all time points (Fig. 1).
There was a positive correlation between the increase in MMD after treatment cessation and the deterioration of the HIT-6 scores (p = 0.014, r = 0.313). However, the HIT-6 sum scores increased significantly from 60.00 ± 7.56 to 62.96 ± 7.21 also in patients with a less than 30% increase in MMD (p = 0.011).
Changes in generic HRQoL
Effects of treatment discontinuation on the EQ-D5-L5
The mean total EQ-D5-L5 score worsened significantly during the treatment pause (p < 0.001) (Table 2, Fig. 2). The changes were only significant in patients treated with a CGRP-R mAb (p < 0.001). Changes in the EQ-5D-5L score did not correlate with changes in MMD from V1 to V3 (p = 0.377, r = 0.115).
The subgroup of patients with a less than 30% increase in MMD after mAb cessation also showed a significant decline in EQ-5D-5L values over time (∆ -0.10 points V1 vs. V3, p = 0.005).
Effects of treatment discontinuation on the short-form (SF-12)
The mental (MCS-12) and physical (PCS-12) components of the SF-12 deteriorated significantly throughout the discontinuation attempt (Table 2). In the subgroup analyses, statistical significance was reached only in the CGRP-R group for the PCS-12 score (p = 0.002) and in the ligand group for the MCS-12 score (p = 0.041). Neither the PCS-12 nor the MCS-12 score changes between V1 and V3 correlated significantly with the changes in migraine frequency after treatment discontinuation (PCS-12: p = 0,296, r = 0,136, MCS-12: p = 0,186, r = 0,171).
Patients with less than 30% increase of MMD reported a significant decline in PCS-12 total scores from 37.63 ± 10.02 at V1 to 33.53 ± 9.52 at V3 (p = 0.021).
This analysis revealed a deterioration in the quality of life of patients with migraine after the cessation of preventive treatment with a CGRP(−R) mAb. The impact of headache on patients’ lives increased and the general wellbeing deteriorated during the three-month medication discontinuation period.
Data on HRQoL after long-term therapy with mAbs and a subsequent medication pause under real world conditions does not exist. The changes in HRQoL in this study are clinically meaningful when compared to established minimally clinically important differences (MCID) for each of the questionnaires. The MCID for the HIT-6 questionnaire can vary between different headache types and populations . For migraine, Smelt et al. determined within-person changes of more than 2.5 points to be meaningful for the clinical practice . Both study groups as well as the subgroup with less than 30% increase in MMD met this threshold in our analysis. MCID for generic HRQoL (EQ-5D-5L and SF-12) in headache patients have not been established yet. However, the threshold for relevant changes has been determined for several chronic diseases (e.g. chronic obstructive pulmonary disease) and pain conditions (e.g. osteoarthritis, low back pain) [42,43,44,45]. In these previous studies, the MCID for the EQ-5D-5L ranked between 0.04 and 0.32 and for both SF-12 scale scores between 3.3 and 3.8 [42,43,44,45]. The changes in our cohort are well in the range that is considered clinically meaningful in the aforementioned conditions [42,43,44,45].
Of note, there was no correlation between the changes in the generic HRQoL questionnaire scores and the change of migraine frequency. Our findings support previous studies, which illustrated that headache frequency is not the only factor influencing HRQoL in patients with migraine [28, 29].
Headache impact was an endpoint in several clinical trials for CGRP(−R) mAbs in migraine preventive treatment. In the double-blind, placebo-controlled trial of erenumab in patients with CM, HIT-6 scores decreased from ~ 63 points at baseline to ~ 57 points after three treatment months . In the STRIVE trial for EM, erenumab led to a HIT-6 reduction from ~ 60 to ~ 54 points in months 4–6 . Similarly, patients with CM treated with fremanezumab reported a decrease from ~ 64 to ~ 57 points at the end of a 12-week double-blind phase .
In our cohort, almost 40% of patients reported an increase of ≥6 points in the HIT-6 sum score. The magnitude of change in these patients is comparable to the results of randomized-controlled trials, though in the opposite direction.
The deterioration of HRQoL after mAb cessation is new and expands our knowledge on discontinuation attempts in clinical practice. In the parent study of this analysis, we described an increase of migraine and headache frequency over three months . Acute medication intake went gradually back to baseline levels from before the initiation of mAbs preventative treatment . Two other real-world studies on migraine frequency also found a significant deterioration one and three months after treatment discontinuation [19, 20].
From phase 3 clinical trials, HRQoL data after treatment termination is available for galcanezumab in the prophylaxis of episodic migraine [47, 48]. In both EVOLVE trials, HRQoL was measured with the Migraine-Specific Quality of Life Questionnaire (MSQ) Role Function-Restrictive Domain up to three months after the end of the double-blind treatment phase, when patients received no drug . The initial benefit of galcanezumab on MSQ scores decreased after treatment cessation. Three months after discontinuation, the MSQ scores of patients in the galcanezumab group were not different from the placebo group anymore . The data from our study support the findings from the EVOLVE trials.
This study revealed some differences between patients treated with a CGRP-R mAb and patients treated with a CGRP mAb. For all questionnaires but the MCS-12, HRQoL was more severely impaired three months after the cessation of erenumab than galcanezumab or fremanezumab. This might be due to erenumab’s shorter elimination half-life time with about 21 days  as opposed to the half life time of galcanezumab (t/2 = 27 days) and fremanezumab (t/2 = 30 days) [51, 52].
Considering the deterioration of not only headache frequency but also HRQoL during a discontinuation attempt, the question remains, if treatment pauses should be carried out rigorously. It is also matter of debate when to resume mAb prophylaxis if migraine deteriorates. To date, migraine frequency is the main criterion for the prescription of migraine preventative treatment . A steep increase of MMD is likely to influence the physician towards restarting the treatment after a discontinuation attempt. Our study shows that most patients suffer from an impaired HRQoL during treatment discontinuation, even without a relevant worsening of migraine frequency. Monitoring HRQoL could therefore represent an important addition to the evaluation of headache data in clinical practice.
We did not assess the patients’ HRQoL before the start of mAb prophylaxis. Comparison to baseline levels prior to treatment begin could provide further insight into the impact of CGRP(−R) mAbs on the patients’ wellbeing and should be included in further research. Our results might be influenced by the nocebo effect after cessation of a successful treatment. Psychological factors, such as fear of migraine worsening, anxiety or catastrophizing thoughts, might have contributed to the worsening of HRQoL. Further studies should aim to better evaluate such psychological constructs in the context of treatment discontinuation.
This bias cannot be separated from the underlying worsening due to treatment discontinuation in this real-world setting. However, we aimed to provide a real-world picture of treatment discontinuations and such bias is intrinsic in clinical practice.
Our results show a significant decline in headache impact and generic HRQoL of migraine patients after treatment discontinuation of a CGRP(−R) mAb. The monitoring of HRQoL during a discontinuation attempt provides information in addition to headache diaries and may help to decide if and when to resume preventive therapy.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
calcitonin gene-related peptide
calcitonin gene-related peptide receptor
Deutsche Migräne- und Kopfschmerzgesellschaft, German Migraine and Headache Society
European Headache Federation
Headache Impact Test 6
health-related quality of life
minimal clinically important differences
Mental Component Summary 12
Monthly Migraine Days
Migraine-Specific Quality of Life Questionnaire
Physical Component Summary 12
Short Form 12
half life time
Study visit 1
Study visit 2
Study visit 3
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We thank Dr. Nikolaus Behr, Dr. Pawel Fidzinski and Dr. Andreas Horn for their help in recruiting patients.
Open Access funding enabled and organized by Projekt DEAL.
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The study was approved by the Charité Ethical Committee (EA1/274/19). All participants gave written informed consent after they received adequate study information.
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MT reports personal fees from TEVA. JM reports personal fees from Novartis. AS reports personal fees from TEVA and Novartis. LN has contributed to the advisory boards of Hormosan, Lilly, Novartis, and Teva, and received speaking fees from Allergan, Bial, Hormosan, Lilly, Novartis, and Teva; LN received research funding from Deutsche Zentrum für Luft- und Raumfahrt. BR reports research grants from Novartis, and personal fees from Allergan, Hormosan, Lilly, Novartis, and Teva. UR received honoraria for consulting and lectures from Amgen, Allergan, Abbvie, Eli Lilly, Lundbeck, Novartis, electroCore, Medscape, StreaMedUp, and Teva; UR received research funding from the German Federal Ministry of Education and Research and Novartis. The other authors have nothing to disclose.
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Terhart, M., Mecklenburg, J., Neeb, L. et al. Deterioration of headache impact and health-related quality of life in migraine patients after cessation of preventive treatment with CGRP(−receptor) antibodies. J Headache Pain 22, 158 (2021). https://doi.org/10.1186/s10194-021-01368-7