A Study to Test the Effectiveness and Safety of Fremanezumab on Participants With Fibromyalgia

The FIQR is a commonly used instrument in the evaluation of fibromyalgia participants. It contains 21 questions in 3 domains: function (9 questions), overall impact (2 questions), and symptoms (10 questions). Questions are graded on a 0 to 10 numeric scale with 10 being the worst. All questions are framed in the context of the last 7 days. The sub-total score for each domain is the summation of scores in the domain. The function sub-total score ranges from 0 (better) to 90 (worst), with a lower score indicating better (higher) function; overall impact sub-total score ranges from 0 to 20, with a lower score indicating better (lower) impact; the symptoms sub-total score ranges from 0 to 100, with a lower score indicating a better (lower) level of symptoms. Baseline was defined as the last 14 days before the first dose of study drug.

The PGIC scale evaluates all aspects of participants' health and assesses if there has been an improvement or decline in clinical status since the start of the study. Participants recorded responses to the PGIC scale at Week 12. Improvement was recorded on a 7-point scale, with 1 = very much improved, 2 = Much Improved, 3 = Minimally Improved, 4 = No Change, 5 = Minimally Worse, 6 = Much Worse, and 7 = Very Much Worse. Scale "much improved" or "very much improved" were considered improved.

The PI-NRS is an 11-point pain intensity numerical rating scale where 0=no pain and 10=worst possible pain; higher scores indication more pain. Weekly average of the daily average PI-NRS pain score over the past 24 hours was derived using formula: Summation of non-missing efficacy variable in an analysis week divided by the number of days with non-missing efficacy variable in the analysis week.

The PI-NRS is an 11-point pain intensity numerical rating scale where 0=no pain and 10=worst possible pain; higher scores indication more pain. Weekly average of the daily average PI-NRS pain score over the past 24 hours was derived using formula: Summation of non-missing efficacy variable in an analysis week divided by the number of days with non-missing efficacy variable in the analysis week.

The PI-NRS is an 11-point pain intensity numerical rating scale where 0=no pain and 10=worst possible pain; higher scores indication more pain. Weekly average of the daily worst PI-NRS pain score over the past 24 hours was derived using formula: Summation of non-missing efficacy variable in an analysis week divided by the number of days with non-missing efficacy variable in the analysis week. Baseline was defined as the last 14 days before the first dose of study drug.

The PROMIS SF8a scale contains 8 items and assesses sleep disturbance over the past 7 days. One item assessing overall sleep quality use a scale of very poor, poor, fair, good, or very good. Other 7 items use a scale of not at all, a little bit, somewhat, quite a bit, or very much. Each item of the PROMIS sleep disturbance SF8a is on 5-point scales (1 to 5), with 1 for the lowest sleep disturbance and 5 for the highest sleep disturbance. The total score ranging from 8 (lowest sleep disturbance) to 40 (highest sleep disturbance) was calculated as the summation of 8 non-missing scores. T-score was calculated from the total raw score using the scoring table (PROMIS-Sleep Disturbance Scoring Manual) with a mean of 50 and a standard deviation of 10. Possible range for T-score is 30 to 80, with higher scores indicating greater severity of sleep impairment.

The PROMIS physical function scale measures self-reported capability. This includes the functioning of one's upper extremities (dexterity), lower extremities (walking or mobility), and central regions (neck, back), as well as instrumental activities of daily living, such as running errands over the past 7 days. A single physical function capability score is obtained from a SF. The PROMIS physical function SF12a scale contains 12 items with 5-point scales (1 [not at all] to 5 [very much]) for each item with a total score ranging from 12 (poor physical function) to 60 (better physical function). A higher score indicates greater level of physical capability. Total raw score was calculated as the summation of 12 non-missing scores for participants who can walk 25 feet or summation of 6 non-missing scores for participants who cannot walk for 25 feet. The calculated total raw score was converted into scale score using the scoring tables (PROMIS-Physical Function Scoring Manual).

The PROMIS Fatigue SF8a contains 8 items with 5-point scales (1 [never] to 5 [always]) for each item over the past 7 days. The total raw score ranges from 8 (lowest level of fatigue) to 40 (highest level of fatigue) was calculated as the summation of 8 non-missing scores. T-score was calculated from the total raw score using the scoring table (PROMIS-Fatigue Scoring Manual) with a mean of 50 and a standard deviation of 10; scores higher than 50 indicate greater fatigue compared to the reference population.

An AE was defined as any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Serious adverse events (SAEs) were defined as death, a life-threatening AE, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability or incapacity, a congenital anomaly or birth defect, or an important medical event that jeopardized participant and required medical intervention to prevent 1 of the outcomes listed in this definition. Any AE occurring on or after the first dose of study drug is considered a treatment-emergent AE (TEAE). A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

Potentially clinically significant serum chemistry abnormalities included: Blood urea nitrogen ≥10.71 millimoles (mmol)/liter (L) and Gamma-glutamyl transpeptidase (GGT) ≥3 * upper limit of normal (ULN).

Potentially clinically significant hematological abnormalities included: White blood cells (WBCs) count ≤3.0 * 10^9/L; Hemoglobin ≤95 grams (g)/L in females; Hematocrit <0.32 L/L in females; Platelets ≥700 * 10^9/L; and Eosinophils/Leukocytes ≥10%.

Clinically significant vital signs abnormalities included: Systolic blood pressure (BP): ≤90 millimeters of mercury (mmHg) and decrease from baseline of 20 mm Hg; Diastolic BP: ≥105 mmHg and increase from baseline of ≥15 mmHg or ≤50 mmHg and decrease from baseline of ≥15 mmHg.

Physical examination included: General appearance, HEENT (head, ears, eyes, nose, and throat examination), chest and lungs, heart, cardiovascular, abdomen, musculoskeletal, skin, lymph nodes, neurological, and extremities/back.

The number of participants with a difference (shift) from baseline in any of the following ECG parameters is reported by group: heart rate, PR interval, QRS interval, RR interval, QT interval corrected usingthe Fridericia formula (QTcF) and QT interval corrected using the Bazett's formula (QTcB). Shifts represented as Baseline - endpoint value (last observed post-baseline value).

Injection site AEs included injection site pain, injection site erythema, injection site induration, injection site pruritus, injection site bruising, injection site nodule, injection site swelling, and injection site warmth.