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Objectives  To describe the methodology and implications of the patient‐identified most bothersome symptom (PI‐MBS) measure used in the phase 3, multicenter, randomized, double‐blind, placebo‐controlled, and parallel‐group PROMISE‐2 trial and to evaluate the contribution of this measure to the assessment of the preventive migraine benefits of treatment.    Background  Although freedom from MBS is a coprimary endpoint in acute migraine treatment trials, its evaluation in preventive migraine trials is limited. The PROMISE‐2 study assessed a unique PI‐MBS measure as a secondary endpoint.    Methods  This was a secondary analysis of data from the PROMISE‐2 study. Adults with chronic migraine (CM) were randomized to receive intravenous (IV) eptinezumab 100 mg, eptinezumab 300 mg, or placebo, administered on day 0 and every 12 weeks. At the screening visit, patients were asked to verbally describe the MBS associated with their CM; the question format was open ended. At subsequent visits, patients were asked to rate the overall change in severity of their MBS from study inception to that time point, using a 7‐point ordinal scale ranging from “very much worse” (−3) to “very much improved” (+3). Patients completed the Patient Global Impression of Change (PGIC) assessment during the same visits, using an identical rating scale and recall period. Endpoints were summarized descriptively; post hoc correlations using the methodologies of Pearson and Spearman were calculated to evaluate relationships between PGIC and PI‐MBS and between PGIC and mean monthly migraine days (MMDs; primary efficacy endpoint in PROMISE‐2).    Results  Altogether, 1072 patients received treatment (eptinezumab 100 mg,  n  = 356; eptinezumab 300 mg,  n  = 350; placebo,  n  = 366) and were included in the analysis. There were 23 unique MBS identified; those reported by ≥10 patients included light sensitivity (18.7%), nausea/vomiting (15.1%), pain with activity (13.7%), pain (12.4%), headache (11.2%), sound sensitivity (7.3%), throbbing/pulsating pain (4.7%), cognitive disruption (4.1%), fatigue (2.4%), mood changes (1.5%), and sensitivity to smell (0.9%). Four weeks after the first dose (week 4), the rates of much or very much improvement in PI‐MBS were higher with eptinezumab 100 mg (45%) and 300 mg (57%) than with placebo (29%). Four weeks after the second dose (week 16), the proportions with much or very much improvement in PI‐MBS had increased to 58%, 65%, and 36%, respectively. At each time point, the percentages of patients with PGIC ratings of much or very much improved were similar to those for patient‐reported improvement in PI‐MBS. Patient ratings of changes in PI‐MBS and PGIC correlated strongly across time points (Pearson,  r  range, 0.83–0.88; Spearman,  r  range, 0.83–0.89); the absolute value of the correlations was greater than the correlation among changes in MMDs and PGIC (Pearson,  r  range, −0.49 to −0.52; Spearman,  r  range, −0.49 to −0.52).    Conclusions  Among patients with CM in the PROMISE‐2 study, a broad range of PI‐MBS was reported at baseline. Throughout the study, patients treated with eptinezumab reported greater improvement in their PI‐MBS severity compared with placebo recipients, and this improvement correlated strongly with PGIC findings. Collectively, these results indicate that PI‐MBS is a promising and novel outcome measure for preventive trials of CM and thus may provide a unique patient‐centered approach for identifying and measuring the burden of migraine symptoms that matter most to each patient, as well as the benefits of treatment.

Patient‐identified most bothersome symptom in preventive migraine treatment with eptinezumab: A novel patient‐centered outcome