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CADTH Reimbursement Recommendation
CADTH recommends that atogepant (Qulipta) be reimbursed by public drug plans for the prevention of migraine if certain conditions are met.
For migraine prevention, Qulipta should only be covered in adult patients who have tried at least 2 other types of treatments for the prevention of migraine.
Qulipta should only be reimbursed if it is prescribed by a prescriber with experience managing chronic migraine (CM) headaches and if the cost of Qulipta is not more than the least costly calcitonin gene–related peptide (CGRP) inhibitor currently funded for this population. Qulipta should not be reimbursed for use in combination with other CGRP inhibitors for the prevention of migraine in adult patients with CM.
Migraine is a type of headache characterized by recurrent attacks of pulsating pain on 1 side of the head. Episodes can last from 4 to 72 hours, if untreated. The severity of pain ranges from moderate to severe, and it may be accompanied by increased sensitivity to light, sound, and odours, as well as nausea, vomiting, numbness, and auras. In Canada, it is estimated that migraine affects 1 person in 10, and women are more likely than men to be affected.
Many patients have difficulties finding effective treatments and need to try several medications before realizing benefit. Furthermore, conventional treatments for migraine prevention are available for oral administration but are associated with unwanted side effects.
Treatment with Qulipta is expected to cost $6,735 per patient per year.
The CADTH Canadian Drug Expert Committee (CDEC) recommends that atogepant be reimbursed for the prevention of migraine in adults with CM only if the conditions listed in Table 1 are met.
One randomized placebo-controlled trial (the PROGRESS trial) demonstrated that the use of atogepant 60 mg once daily in patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed (N = |||) resulted in added clinical benefit when compared with placebo. The evidence from the trial showed that, after 12 weeks of treatment, atogepant reduced monthly migraine days (MMDs) and monthly headache days (MHDs). In the full set analysis of the primary end point of the PROGRESS trial, the reduction in MMDs from baseline was higher for patients treated with atogepant 60 mg once daily than those who received placebo, with least squares mean difference (LSMD) of –1.82 days (95% confidence interval [CI], –2.89 to –0.75 days). In the population of patients in whom 2 or more medications had failed in the PROGRESS study, the reduction in MMDs from baseline was higher for patients treated with atogepant 60 mg once daily than those who received placebo, with LSMD in change from baseline in mean MMDs of ||||| days (95% CI, ||||| to ||||| days). In the same group, the proportion of patients experiencing at least a 50% reduction in MMDs was greater with atogepant 60 mg once daily than with placebo (||||| versus ||||||, respectively). The odds of achieving at least a 50% reduction in MMDs was higher with atogepant 60 mg once daily than with placebo (odds ratio [OR] = ||||; 95% CI, |||| to ||||).
Patients and clinical experts identified the need for different treatment options. CDEC concluded that atogepant 60 mg once daily met some of the needs identified by patients, including reduction in the mean number of migraine days, headaches, and days of medication use per month, as well as improvement in function, with the convenience and ease of administration of an oral medication.
At the sponsor-submitted price for atogepant and publicly listed price for all comparators, atogepant was less costly than fremanezumab, eptinezumab, and galcanezumab, and more costly than onabotulinumtoxinA. Given that there is insufficient evidence to support a clinical benefit with atogepant compared with relevant comparators, the total drug cost of atogepant should not exceed the total drug cost of the lowest-cost CGRP inhibitor reimbursed for the prevention of CM in the population considered in this reimbursement request.
Reimbursement Conditions and Reasons.
Migraine is a multifactorial, disabling neurologic disease affecting 8% of the population of Canada, characterized by recurrent and often debilitating headaches of moderate to severe intensity accompanied by neurologic symptoms. Migraine is commonly categorized, according to the frequency of attacks, as episodic migraine (EM) or CM. People with migraine who have fewer than 15 MHDs are commonly referred to as having EM. CM has been defined as headaches occurring on 15 or more days per month for more than 3 months, of which at least 8 days per month have the features of migraine attacks. As attack frequency or severity increases, migraine management requires the use of both acute and preventive treatments. Multiple pharmacologic options for migraine prevention are currently available in Canada for patients with CM, including established oral preventive treatments, injectable onabotulinumtoxinA, or self-injectable and infusion CGRP monoclonal antibodies.
Atogepant is a CGRP receptor antagonist that has been approved by Health Canada (Notice of Compliance on May 2, 2024) for the prevention of migraine in adults who have at least 4 MMDs. Atogepant is available as oral tablets in 10 mg, 30 mg, and 60 mg doses, and the dosage recommended in the product monograph is 60 mg once daily.
To make its recommendation, the committee considered the following information:
CADTH received 2 patient-group submissions, 1 from the Canadian Migraine Society and a second from Migraine Canada and Migraine Quebec. The Canadian Migraine Society gathered data from 3 perspectives: experience from support groups with 3,200 members, personal disease experience, and email interviews with 19 patients currently taking atogepant, conducted from November 1 to December 12, 2023. The information provided by Migraine Canada and Migraine Quebec was collected through a quality-of-life online survey that was launched in late fall of 2021. In total, 1,165 adults in Canada living with migraine and their caregivers responded to the online survey. Migraine Canada launched an additional survey in November of 2023 to seek input from patients with experience with atogepant. In total, 230 adults with migraine responded to that survey.
Most of the patients from the 2 patient groups shared similar symptoms and acknowledged the impact of symptoms on their day-to-day lives and employment. The Canadian Migraine Society reported that migraine — and especially CM — affects every facet of a person’s life. In the survey conducted by Migraine Canada and Migraine Quebec, the 3 outcomes reported to be most valuable to patients when trying a preventive treatment were effects on headache intensity, headache frequency, and symptoms other than pain, such as sensitivity to light and sound, nausea, and brain fog. The Canadian Migraine Society further stated that the desired outcome should be an improved quality of life.
Both groups agreed that patients with CM need access to options for effective medications (both preventive and acute), because patients with migraine may not respond similarly to the same medication or treatment. Migraine Canada and Migraine Quebec also highlighted that, considering the opioid crisis, new medications should play a role in a national plan to better manage pain and alleviate the need for opioids.
The clinical expert consulted by CADTH identified several unmet needs in the treatment of CM, including poor adherence to medication, often due to common side effects, even when treatments are effective. Additionally, accessibility issues, such as the requirement for specialized administration of certain medications such as onabotulinumtoxinA, contribute to the need for treatments that are more easily accessible. The expert noted that atogepant shows promise as a first-line treatment option thanks to its effectiveness and low side-effect profile, but cost considerations may limit its initial prescription, potentially restricting it to patients who have already tried multiple medications.
The clinical expert advised caution for patients with certain medical histories, such as stroke or cardiac disease, as well as special considerations for patients of childbearing age.
According to the clinical expert, treatment response would be assessed by reductions in headache frequency or severity. There are no standardized criteria for discontinuing an established treatment, although a minimum trial period of 6 months was recommended before considering the discontinuation of atogepant.
The clinical expert also mentioned that atogepant offers potential benefits for patients with migraine, particularly reduction in migraine and headache frequency in those with treatment-resistant or frequent EM. It can be prescribed by primary care providers without requiring specialized monitoring. However, cost considerations and the need for further research into long-term efficacy and discontinuation criteria remain significant factors in its clinical use.
CADTH received 2 clinician group submissions from the ANSG and the CHS. The ANSG held 2 professional meetings to discuss the migraine treatment landscape, identify barriers to treatment access, and discuss the role of atogepant in fulfilling unmet patient needs on October 5 and December 18, 2023. The CHS gathered information from published clinical evidence and expert opinions from headache specialists in Canada and internationally. The ANSG identified the top 3 unmet treatment needs for migraine in Canada: adverse events (AEs) and inadequate response to acute and preventive treatments; dependence on specialists to prescribe preventive treatments; and restrictive reimbursement criteria that prevent patients’ access to the care that they need. The CHS also found similar treatment gaps and some additional ones, such as the effectiveness of current available treatments wearing off, contraindications to certain drugs in some patient populations, and patients’ preference for oral formulations over receiving drugs by injection. The ANSG stated that atogepant is the first oral, small-molecule CGRP antagonist approved for the preventive treatment of migraine in Canada. The CHS also commented that atogepant could be combined with drugs with a different mechanism, although evidence to support the effectiveness of such combinations is lacking. The ANSG believed that specialists, family physicians, and nurse practitioners with experience diagnosing migraine could prescribe the product and monitor the patients. The CHS further stated that prescribing atogepant should not be restricted to neurologists or specialists, since the drug is well tolerated and safe, similar to many other drugs prescribed in primary care.
Input from the drug plans identified factors pertaining to relevant comparators, considerations for initiation and discontinuation of therapy, generalizability, care provision, and system and economic considerations. CDEC weighed the body of evidence and input from the clinical expert consulted by CADTH, who provided advice on the potential implementation issues raised by the drug programs.
Responses to Questions From the Drug Programs.
One pivotal randomized controlled trial (the PROGRESS trial) was included, assessing atogepant for treatment of patients with CM. The PROGRESS study is a randomized placebo-controlled trial that assessed the effects of atogepant 60 mg once daily against placebo in adult patients with CM. The study included a subgroup of patients who have experienced an inadequate response, intolerance, or contraindication to at least 2 oral preventive migraine medications. There was a prespecified subgroup of patients with in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed (N = ||| patients). The study assessed efficacy outcomes (MMDs, MHDs, and monthly acute medication use), function or disability outcomes (Performance of Daily Activities, missed school days or workdays, and impact of headaches on daily function), health-related quality of life, health resource utilization, and harms.
The primary efficacy end point in the PROGRESS study was the change from baseline in mean MMDs across the 12-week treatment period. In patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed (n = |||), the least squares (LS) mean change from baseline, as measured by the mean MMDs across the 12-week treatment period, was –|||| days (95% CI, ||||| to ||||| days) for atogepant 60 mg once daily compared with ||||| days (95% CI, ||||| to ||||| days) for placebo. The LSMD in change from baseline in mean MMD between the 2 groups was –|||| days (95% CI, ||||| to –|||| days; P = ||||||), favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the proportion of patients who had a reduction of at least 50% in the 3-month average of MMDs with atogepant 60 mg once daily was ||||| compared with ||||| with placebo. The adjusted absolute between-group difference was |||||| (95% CI, |||| to ||||||). The OR for the proportion of patients who demonstrated a reduction of at least 50% in the 3-month average of MMDs was |||| (95% CI, |||| to ||||; P = ||||||), favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the LS mean change from baseline in the number of mean MHDs across the 12-week treatment period was ||||| days (95% CI, ||||| to ||||| days) with atogepant 60 mg once daily compared with ||||| days (95% CI, –|||| to ||||| days) with placebo. The LSMD in change from baseline between the 2 groups was ||||| days (95% CI, ||||| to ||||| days; P = ||||||), favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the LS mean change from baseline in the mean number of days of acute medication use across the 12-week treatment period was ||||| |||| |||| ||| ||||| || ||||| ||||| for atogepant 60 mg once daily compared with ||||| |||| ||| ||||| || ||||| ||||| with placebo. The LSMD in change from baseline in mean number of days of acute medication use between atogepant 60 mg once daily and placebo was ||||| |||| |||| ||| ||||| || ||||| ||||| | | |||||||, favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the LS mean change from baseline in the mean monthly Performance of Daily Activities domain score of the Activity Impairment in Migraine–Diary (AIM-D) measure across the 12-week treatment period was |||||| ||| | ||||| for atogepant 60 mg once daily compared |||| ||||| ||| | ||||| for placebo, where negative values imply improvements from baseline. The LSMD in change from baseline in mean monthly Performance of Daily Activities domain score of AIM-D across the 12-week treatment period between the 2 groups was ||||| |||||| |||| ||| ||||| || ||||| ||||||| | | ||||||||, favouring atogepant 60 mg once daily.
This end point was not available for the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed. Hence, it was assessed only in the overall modified intention-to-treat (mITT) population, where the LS mean change from baseline in the Migraine Disability Assessment (MIDAS) total score at week 12 was |||||| |||||| |||| ||| |||||| || |||||| ||||||| for atogepant 60 mg once daily (improvement) as compared with |||||| |||||| |||| ||| |||||| || |||||| ||||||| with placebo. The LSMD in change from baseline between the 2 groups was |||||| |||||| ||||||| |||||| || ||||| ||||||| | | ||||||||, favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the LS mean change from baseline in the Headache Impact Test (HIT-6) total score at week 12 ||| ||||| |||||| |||| ||| ||||| || ||||| ||||||| for atogepant 60 mg once daily (negative numbers implying improvement) and ||||| |||||| |||| ||| ||||| || ||||| ||||||| in the placebo group. The LSMD in change from baseline between the 2 groups was ||||| |||||| |||| ||| ||||| || ||||| ||||||| | | |||||||, favouring atogepant 60 mg once daily.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, the LS mean change from baseline in Migraine-Specific Quality of Life Questionnaire version 2.1 (MSQ v2.1) Role Function Restrictive domain score at week 12 was ||||| |||||| |||| || ||||| || ||||| ||||||| higher for atogepant 60 mg once daily, while the placebo group had an increase of ||||| |||||| |||| || |||| || ||||| |||||||, where higher values suggest an improvement in patients’ functioning in daily social and work-related activities. The LSMD in change from baseline in mean monthly MSQ v2.1 Role Function Restrictive Domain Score at week 12 between the 2 groups was ||||| |||||| |||||| |||| ||| |||| || ||||| ||||||| | | ||||||| in the atogepant 60 mg once daily group when compared with placebo.
This was only evaluated in subset of the overall (mITT) population, and no information was provided for the subgroup of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed. In the overall (mITT) population, the LS mean change from baseline in the percent work time missed, assessed with the Work Productivity and Activity Impairment (WPAI) questionnaire: Migraine at week 12 was ||||| |||||| |||| ||| |||||| || ||||| ||||||) for atogepant 60 mg once daily (negative values imply improvement) compared with ||||| |||||| |||| ||| ||||| || ||||| ||||||) with placebo. The LSMD in change from baseline in percent work time missed at week 12 was –4.85 points (95% CI, –9.48 to –0.23 points; P = 0.0397), favouring atogepant 60 mg once daily.
The most frequently reported AEs (5% or more of patients in the safety population) in the atogepant treatment group were constipation (10%) and nausea (9.6%). In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, patients also experienced |||| ||||| || |||||||||||||||.
In the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, |||||||||||| ||| |||||||| || ||||| of patients in the atogepant 60 mg once daily treatment group and |||| of patients in the placebo treatment group. |||||| ||| |||||||| || |||| of patients in the atogepant 60 mg once daily treatment group, and |||| of patients in the placebo treatment group. ||||||||||||||| ||| |||||||| || |||| of patients in the atogepant 60 mg once daily treatment group, and |||| of patients in the placebo treatment group.
|| ||| |||| ||||||| ||||||||||| |||| |||| |||||||||| || ||| ||||||||| || || || ||||||||| ||||| ||| ||||||| |||||| || ||| ||||||| ||||||| |||||||||| |||| |||| |||||||||| || ||| ||||||||| || || || ||||||||| ||||| ||| ||||||| |||||| ||||| |||| || |||||||||| |||||||||| ||||||||||| || |||| ||||||| ||| ||||||||| || || || ||||||||| ||||| ||| ||| ||||||| ||||||
AEs leading to treatment discontinuation were infrequent in the atogepant 60 mg once daily treatment group and placebo group, || |||| ||| ||||||| ||| |||| |||||||||||. All AEs leading to treatment discontinuation in the atogepant 60 mg once daily group occurred in fewer than 1% of patients.
No deaths were reported in the PROGRESS trial.
AEs of special interest were reported at low rates. | ||||| || | ||||||| || ||| ||||||| ||||||||| ||||| || ||| ||||||| |||||||||| |||||||| || || || |||||||| ||||||||| || |||||||| || ||||||||| ||||| |||||||| || || || |||||||| ||||||||. A total of 3 patients had an elevated alanine aminotransferase or aspartate aminotransferase laboratory value that was 3 × the upper limit of normal or higher, which were subject to blinded adjudication by the Adjudication Committee.
The PROGRESS trial is a randomized controlled trial investigating the efficacy and safety of atogepant 60 mg once daily (the dosage of interest for this review) compared with placebo. The study involved a randomization and allocation concealment process that was judged to be properly implemented, ensuring an overall balanced distribution of participants to the atogepant 60 mg once daily or placebo arms. The number of prior migraine prevention medications failed was a stratification factor in the randomization, which should ensure that the randomization is upheld in the subgroup of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed. Some minor baseline imbalances were observed for the WPAI end point, obtained from a subset of the population, with imbalances between groups. However, these imbalances were judged to present a low risk for introducing bias or for suggesting problems in the randomization process. In the study, patients maintained good adherence to the intended intervention. Concomitant medication use was comparable across the placebo and atogepant 60 mg once daily treatment groups.
The subgroup of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, which represents ||||| (n = |||) of the total mITT population, is of interest for this CADTH report because it is the focus of the sponsor’s reimbursement request. However, the sample size (power) calculation did not consider this subgroup separately. Therefore, it is unknown whether there was enough statistical power to detect any differences in treatment effect between the intervention and comparator arms in this subgroup. However, greater effect sizes for the subgroup of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed were consistent across all key clinical end points (change from baseline in MMDs, MHDs, days of medication use, reduction of at least 50% in 3-month average MMDs) compared with the mITT population. There were no instances of meaningful missing outcome data, except for | |||||| patients in the atogepant 60 mg and || |||| in the placebo group for the main outcomes in the mITT population, which was unlikely to significantly affect the results. In the PROGRESS study, measurements of the outcomes were appropriate. The blinding of participants and clinical investigators was kept throughout the conduct of the study, and there is no evidence that patients or personnel became unblinded. The results were reported in accordance with predefined protocols, including the results from the subgroup of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed, reducing the likelihood of selective reporting bias.
Overall, the study appears to have minimized risks across all domains assessed for risk of bias for the outcomes addressed when comparing atogepant with placebo.
For the pivotal study identified in the sponsor’s systematic review, GRADE was used to assess the certainty of the evidence for outcomes considered most relevant to inform CADTH’s expert committee deliberations, and a final certainty rating was determined, as outlined by the GRADE Working Group.
Following the GRADE approach, evidence from randomized controlled trials start as high-certainty evidence but can be rated down if there are concerns about study limitations (internal validity or risk of bias), inconsistency across studies, indirectness, imprecision of effect estimates, and publication bias.
When possible, certainty is rated in the context of the presence of an important effect (i.e., how certain are we that the effect is a nontrivial treatment effect?). To determine whether an effect is important, GRADE suggests using thresholds of clinical importance (minimal important difference [MID]). If a threshold is not possible to obtain, the certainty is rated in the context of the presence of any treatment effect (i.e., how certain are we that there is any — beneficial or harmful — effect?). In this case, the clinical importance of any effect remains unclear. In all cases, the assessment of certainty of evidence is based on the point estimate of each outcome and where it is located relative to the chosen threshold for a clinically important effect (when a threshold is available) or to the null (when there is no threshold).
A GRADE summary of findings for the body of evidence for this review included the evaluation of the main outcomes considered important by clinicians, patient groups, and stakeholders. These assessments are presented in Table 3 for each outcome included.
Summary of Findings for Atogepant 60 mg Once Daily Versus Placebo for Patients With Chronic Migraine and 2 or More Treatment Failures.
Study 3101-312-002 (Study 312) is a multicentre, open-label, 156-week, long-term safety extension study conducted in all eligible patients who completed the PROGRESS study or ELEVATE study. The ELEVATE study was a phase III, multicentre, randomized, double-blind, placebo-controlled, parallel-group study to evaluate the efficacy, safety, and tolerability of oral atogepant for the prevention of migraine in participants with EM in whom 2 to 4 classes of oral preventive treatments had previously failed. Study 312 consists of a 156-week open-label treatment period and a safety follow-up period of 4 weeks. The primary objective of the study is to assess the safety and tolerability of long-term use of atogepant 60 mg once daily treatment in patients with CM or EM. Efficacy end points for long-term evaluation were included; however, were they considered exploratory. An interim analysis (November 2023) is presented here, including only patients from the PROGRESS study. Patients were instructed to take atogepant 60 mg orally at approximately the same time each day for 156 weeks. Patients were followed for 4 weeks following completion or discontinuation of atogepant. All analyses were performed for the full population in the extension study, and no analyses were presented specific to the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed.
Overall, reductions in mean MMDs, mean MHDs, and mean monthly days of acute medication use relative to the lead-in study baseline were observed during the open-label treatment period. The proportion of patients with at least a 50% improvement in MMDs was 41.0% across the 12-week treatment period in the PROGRESS study, increased to 67.0% for weeks 13 to 16, and remained similar for weeks 29 to 32 and 45 to 48. The change from baseline in monthly Performance of Daily Activities domain score of the AIM-D remained relatively consistent across weeks 13 to 16, weeks 29 to 32, and weeks 45 to 48. Moreover, the change from baseline in the MSQ v2.1 Role Function Restrictive domain score at weeks 12, 20, 28, 36, 44, and 52 remained similar.
At the time of the interim analysis, |||| of patients had completed the study and ||||| were still continuing. Of the 325 patients enrolled in Study 312 from the PROGRESS trial, ||||| discontinued treatment, with ||||||| |||||||||| ||||||| being the most common reason for discontinuation. Treatment-emergent AEs were reported by 265 patients (81.5%). The most commonly reported AEs included COVID-19 (30.8%), constipation (10.2%), nasopharyngitis (9.8%), urinary tract infection (6.2%), and insomnia (5.5%). Serious AEs (SAEs) were reported by 20 (6.2%) patients. The following SAEs were reported by 1 patient each: |||||||| ||||||||||||| ||||||||| ||||||| |||||||||| ||||||||||||| |||||||||||||| |||||| |||||||||||| |||||||||||||| |||| ||||||||| |||||||| ||||||||||||| ||||||||||||||| ||||||| |||| ||||||||| |||||| ||||| |||||||||| ||||||| ||||||| ||||||||||| ||||||||||||| |||||| ||||||| |||||||||| ||||||| ||||||||| ||||||| |||||||| ||||||| ||||||||||||| ||||||| ||||| ||||||| |||||| ||||||||| ||||||||| ||||||||| ||| |||||||| ||||. AEs leading to study drug discontinuation were reported in 27 patients (8.3%) and included: ||||||||| | |||||||| |||||||| || |||||||||| |||||||||||| |||| |||||| |||| ||||||| |||||||||||||||| ||||||||| |||| ||||||||| |||||||||||||||| ||||||||| |||| ||| |||||||||||||||||||| ||||
Study 312 was limited by its open-label and noncomparative design; since there is no comparator, it cannot be confirmed whether the results observed are attributable to the effects of the drug or to the natural history of the condition. Furthermore, the mITT population analyzed excluded ||| of patients. The large missing outcome data (more than ||||) introduces a risk of bias. The open-label and nonblinded nature of the study increases the risk of bias. Because the outcome measures are generally self-reported, they are subjective, and it is uncertain whether they could be replicated in another population beyond that included in the study. No information was provided on the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed (the population considered in this reimbursement request). It is therefore impossible to know whether the effects observed in the full population would be similar in that group. Because the patients who took part in the open-label long-term safety extension phase were originally from the pivotal PROGRESS trial, it is reasonable to expect that the same limitations to generalizability are relevant to the open-label long-term safety extension phase. Given the nature of noncomparative study design, it is impossible to compare the effectiveness and tolerability of atogepant as preventive treatment of CM with other preventive treatment.
The ITC submitted is a network meta-analysis (NMA) conducted by the sponsor. The objective of the NMA was to evaluate the efficacy, safety, and tolerability of atogepant compared with other CGRP inhibitors, i.e., the comparators of interest that are approved medications for the treatment of CM in Canada (atogepant, onabotulinumtoxinA, eptinezumab, erenumab, fremanezumab, and galcanezumab).
A clinical systematic literature review was performed using the population, interventions, comparators, outcomes, and study design criteria previously established for the reimbursement request. || || ||||||| |||||||||| || ||| |||| || ||||||| ||| ||| ||||||||| |||||||| ||| ||| |||.
Baseline characteristics of patients (age, sex, race) involved in all comparisons were overall similar across studies. || ||| ||||||| || |||||||||| ||| ||| |||||||| || || || ||||||||||| ||||||||| || || || |||||| |||||||| |||||| ||||||||| |||| ||||||| ||||||| ||||||||| || |||||| |||| |||||||| || |||| |||| ||| ||||| ||||||||||| ||||| |||| ||||||||| ||| |||||| ||||||||| || ||||||||| || || || |||||||| || ||| |||| || ||| |||||||||||||| ||||| |||| |||| |||||||| ||||||||| ||||||| ||||||||| ||| |||| |||||| These wide CrIs denote imprecise estimates for any comparison of atogepant 60 mg once daily with all active treatments. These wide CrIs were observed whether the analysis was made in the fixed effects or random effects models.
||| ||| || || || ||||||||||| ||||| ||||||| |||| |||| |||||||| |||| ||||||||| ||| |||| || | ||| ||||||||| || ||||||| |||| || ||| || |||||| ||||||||| |||| || |||||| || ||||||||||| || ||| |||| || ||||||||| | ||| |||||||| || |||| ||| |||| ||||||| ||||||| |||||| ||||| |||||||| ||| |||||| || ||| || |||||| ||| ||||||| || |||| || ||||||||| | ||| |||||||| || |||| ||| |||||||| || ||||||||| || || || |||||| |||| |||| |||||| ||||| ||||||||||| ||||||||||||
|| ||| || || ||||||||| ||||| ||| ||||||||| || || || |||||| ||| |||||||||| ||| |||||||||| ||| ||||||| ||||| ||||||||||| |||| ||||| ||||| |||| |||| |||| ||| ||||||| ||| |||| ||||||| |||||| |||||||| || |||| ||| || ||| || |||||||
|||||||| ||| ||| |||||| |||| ||||||||| || || || || ||| |||||||||| || |||||||| |||||| || |||||| |||||||| || ||||||| ||| ||| |||||||| || ||||| ||||| ||| ||||| |||||||||| |||| ||| |||||| ||| |||||||| || ||| || ||| ||||| |||||||||| ||||||||| |||||||||||||| ||||||||||||| ||||||||| |||||| || ||||||||||||| The effect estimates had wide CrIs (imprecision), which conveyed important uncertainty, limiting the ability to draw definite conclusions for these comparisons.
In the evidence from the NMA, only the overall CM population was assessed for harms. In this, ||||||||| || || || |||||| || ||||||||| |||||| || ||| |||| |||||||| || ||||||| ||| ||||||||||| ||| |||
For the rest of the comparisons, the hazard ratios were also accompanied by wide CrIs, which conveyed uncertainty due to imprecision in the hazard rates between atogepant and all relevant comparators.
The systematic review and NMA aimed to evaluate the efficacy and harms of atogepant 60 mg once daily compared with relevant comparators for CM treatment, based on drugs licensed and approved in Canada. While relevant trials for the specific population and comparators were appropriately identified and included, details regarding the screening process were lacking. Despite well-described study designs, there was a notable absence of information on data extraction and risk of bias assessment procedures. Some head-to-head trials were excluded due to strict criteria. To address this, a sensitivity analysis was conducted to address effects based on excluded populations. This ensures the robustness in the final estimates. Some differences, however, were observed between fixed effects and random effects models, implying possible inconsistencies among the included trials.
The construction of networks was thorough, assessing model fit, consistency, convergence, and heterogeneity; establishing comparability among populations included in each network; and upholding the transitivity assumption. However, there was no formal assessment of publication bias, and imprecise effect estimates for several end points posed challenges in drawing definitive conclusions.
Overall, the populations in individual studies were deemed generalizable to the Canadian population, with no significant concerns regarding the applicability of the results detected. However, the NMA did not include several relevant outcomes of interest (e.g., MIDAS, HIT-6, MSQ, WPAI, SAE). Also, relevant to this submission, there was a short length of follow-up, precluding long-term assessments required for rare AEs and efficacy beyond 24 weeks. The lack of comparison with eptinezumab was considered important in the Canadian landscape, as were the few comparisons available for the population of patients in whom 2 or more migraine prevention medications with different mechanisms of action had previously failed.
Overall, the systematic review and NMA effectively synthesized existing evidence; however, some methodological gaps and imprecisions in effect estimates warrant cautious interpretation of the findings.
Summary of Economic Information.
CADTH identified the following key limitations with the sponsor’s analysis:
In the CADTH base case, onabotulinumtoxinA was included as a comparator in jurisdictions where it is funded for the reimbursement population (i.e., Alberta, Ontario). In this analysis, the budget impact of reimbursing atogepant for the prevention of CM in adults who have previously failed to respond, are intolerant to, or have a contraindication to at least 2 migraine preventive therapies is expected to result in a savings of $994,373 over 3 years (year 1: $235,229, year 2: $340,637, year 3: $418,507).
Uncertainty remains in the prices paid by public plans for comparators. The presence of confidential prices for comparators may result in the cost savings realized by the drug plans being lower than predicted by the sponsor’s and CADTH’s base case.
All stakeholder feedback received in response to the draft recommendation is available on the CADTH website.
Dr. James Silvius (Chair), Dr. Sally Bean, Mr. Dan Dunsky, Mr. Bob Gagne, Dr. Ran Goldman, Dr. Trudy Huyghebaert, Dr. Peter Jamieson, Mr. Morris Joseph, Dr. Christine Leong, Dr. Kerry Mansell, Dr. Alicia McCallum, Dr. Srinivas Murthy, Dr. Danyaal Raza, Dr. Edward Xie, and Dr. Peter Zed.
Meeting date: May 22, 2024
Regrets: One expert committee member did not attend.
Conflicts of interest: None.
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Indication: For the prevention of migraine in adults who have at least 4 migraine days per month
Sponsor: AbbVie Inc.
Final recommendation: Reimburse with conditions
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