A Trial to Test if Fremanezumab is Effective in Preventing Migraine in Children and Adolescents

An AE was defined as any untoward medical occurrence in a participant who received the study drug without regard to possibility of causal relationship. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in the Reported AE section.

Serum chemistry tests with clinically significant abnormal findings included: alanine aminotransferase, aspartate aminotransferase, and lactate dehydrogenase ≥2*upper limit of normal (ULN); gamma glutamyl transferase ≥3* ULN; bilirubin ≥34.2 micromole/liter (umol/L); and urea nitrogen ≥9 umol/L. Hematology tests with clinically significant abnormal findings included: hemoglobin ≤100 grams (g)/L (female) or ≤100 g/L (male), hematocrit <0.32 L/L (male), leukocytes ≤3*10^9 cells/L or ≥20*10^9 cells/L, neutrophils ≤1*10^9 cells/L, eosinophils/leukocytes ≥10%, and platelets ≤75x10^9/L. Coagulation parameter test with clinically significant abnormal findings included: prothrombin international normalized ratio (INR) >1.5. Urinalysis laboratory tests with clinically significant abnormal findings included: urine protein and urine glucose ≥2 units (U) increase from baseline. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

The number of participants with a shift from Baseline (Normal, Abnormal CS [Clinically Significant], or Abnormal NCS [Not Clinically Significant]) in any of the following ECG parameters is reported by treatment group: Heart rate, PR interval, QRS interval, RR interval, QT interval, QT interval corrected using the Bazett's formula (QTcB), and QT interval corrected using the Fridericia formula (QTcF). Last assessment was defined as the last observed postbaseline interpretation. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

The number of participants with a shift from Baseline (Normal or Abnormal) in any of the following ECG parameters is reported by treatment group: Heart rate, PR interval, QRS interval, RR interval, QT interval, QTcB, and QTcF. Last assessment was defined as the last observed postbaseline interpretation. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

Potentially clinically significant abnormal vital signs findings included any one of the following: Pulse rate ≥120 beats per minute (bpm) and increase from baseline of ≥15 bpm, or ≤50 bpm and decrease from baseline of ≥15 bpm, or ≤60 bpm and decrease from baseline of ≥15 bpm; systolic blood pressure ≤80 millimeters of mercury (mmHg) and decrease of ≥20 mmHg, or ≤85 mmHg and decrease of ≥20 mmHg, or ≥150 mmHg and increase of ≥20 mmHg; diastolic blood pressure ≤37 mmHg and decrease of ≥15 mmHg, or ≤44 mmHg and decrease of ≥15 mmHg, or ≥100 mmHg and increase of ≥15 mmHg, or ≥93 mmHg and increase of ≥15 mmHg; respiratory rate <15 or <10 breaths/minute; and body temperature ≥38.3 degrees Celsius and change ≥1.1 degrees Celsius. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

The number of participants with a shift from Baseline (Normal or Abnormal) in any of the following organ systems examination is reported by treatment group: general appearance; head, eyes, ears, nose, and throat (HEENT); chest and lungs; cardiovascular; abdomen; musculoskeletal; skin; lymph nodes; neurological, and extremities/back. Last assessment was defined as the last observed postbaseline interpretation. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

C-SSRS is a questionnaire to assess suicidal ideation and suicidal behavior. Suicidal behavior was defined as a "yes" answer to any of 5 suicidal behavior questions: preparatory acts or behavior, aborted attempt, interrupted attempt, actual attempt, and completed suicide. Suicidal ideation was defined as a "yes" answer to any one of 5 suicidal ideation questions: wish to be dead, non-specific active suicidal thoughts, active suicidal ideation with methods without intent to act or some intent to act, without specific plan or with specific plan and intent, any self-injurious behavior with no suicidal intent.

A headache day of at least moderate severity was defined as a calendar day (00:00 to 23:59) where the participant reported either of the following: A day with headache pain that lasted ≥2 hours with a peak severity of at least moderate severity or a day where the participant used acute headache medication (triptans or ergots) to treat a headache of any severity or duration. Monthly averages were derived and normalized to 28 days equivalent by formula: (number of days of efficacy variable over 4-week period/number of days with assessments recorded in in electronic diary [e-diary] for 4-week period) * 28.

A migraine day was defined as a day with at least one of the following: A calendar day (0:00 to 23:59) demonstrating ≥2 consecutive hours of a headache meeting criteria for migraine with or without aura, or a calendar day (0:00 to 23:59) demonstrating ≥2 consecutive hours of a headache meeting criteria for probable migraine, a migraine subtype where only 1 migraine criterion was missing, or a calendar day (0:00 to 23:59) demonstrating a headache of any duration that was treated with migraine specific medications (triptans and ergot compounds). Monthly averages were derived and normalized to 28 days equivalent by formula: (number of days of efficacy variable over 4-week period/number of days with assessments recorded in e-diary for 4-week period) * 28.

A migraine day was defined as a day with at least one of the following: A calendar day (0:00 to 23:59) demonstrating ≥2 consecutive hours of a headache meeting criteria for migraine with or without aura, or a calendar day (0:00 to 23:59) demonstrating ≥2 consecutive hours of a headache meeting criteria for probable migraine, a migraine subtype where only 1 migraine criterion was missing, or a calendar day (0:00 to 23:59) demonstrating a headache of any duration that was treated with migraine specific medications (triptans and ergot compounds). Monthly averages were derived and normalized to 28 days equivalent by formula: (number of days of efficacy variable over 4-week period/number of days with assessments recorded in e-diary for 4-week period) * 28.

A headache day of at least moderate severity was defined as a calendar day (00:00 to 23:59) where the participant reported either of the following: A day with headache pain that lasted ≥2 hours with a peak severity of at least moderate severity or a day where the participant used acute headache medication (triptans or ergots) to treat a headache of any severity or duration. Monthly averages were derived and normalized to 28 days equivalent by formula: (number of days of efficacy variable over 4-week period/number of days with assessments recorded in in electronic diary [e-diary] for 4-week period) * 28.

Participants recorded any headache medications (name of drug, number of tablets/capsules, and the dose in milligrams per tablet/capsule) taken each day in their electronic headache diary device. Acute headache medication included triptans and ergot compounds. Monthly averages were derived and normalized to 28 days equivalent by formula: (number of days of efficacy variable over 4-week period/number of days with assessments recorded in e-diary for 4-week period) * 28.

The PedMIDAS is a scale developed to assess headache-related disability which can be self-administered by the participant or administered by a caregiver. It has been validated in participants aged 4 to 18 years and includes 3 subscales: the impact of headache on school performance (range of scores 0-92), disability at home (range of scores 0-92), social/sport functioning (range of scores 0-92). The subscales are added to get the total score with a range 0 to 276. The total score was used for grading of disability, with 4 score categories of 0 to 10, 11 to 30, 31 to 50, and 51-276 interpreted as disability grades 1 (little or no disability), 2 (mild disability), 3 (moderate disability), and 4 (severe disability), respectively. Higher total scores indicated severe disability. The change from baseline score is reported with a range of -276 to 276 with higher scores indicating more severe disability.

Number of participants who developed ADAs were reported.