Number of Participants With a Headache Within 24 Hours of Challenge Agent Infusion
On day 1 of the double-blind randomization phase participants received 140 mg intravenous erenumab over 30 minutes or matching placebo. On day 8, participants received 10 mol/kg/minute PACAP-38 over 10 minutes and were observed for 24 hours after PACAP-38 infusion.
Number of Participants With Treatment Emergent Adverse Events (TEAEs)
TEAEs were summarised for days 1 to 7 after the participants received placebo or erenumab infusion on day 1 of the Part B randomization phase. TEAEs were also summarized from day 8 to end of study (EOS) after participants had received both investigational product (placebo or erenumab) and the second dose of PACAP-38 on day 8.
Mean Change From Baseline in Systolic and Diastolic Blood Pressure (BP) at Day 1, Day 8 and EOS
Systolic and diastolic BP was assessed during Part B of the study, and the mean change from baseline is presented for the last measurements taken following administration of placebo or erenumab on day 1 (1 hour post-dose), and following administration of PACAP-38 on day 8 (8 hours post-dose). The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Heart Rate at Day 1, Day 8 and EOS
Heart rate was assessed during Part B of the study, and the mean change from baseline is presented for the last measurements taken following administration of placebo or erenumab on day 1 (1 hour post-dose), and following administration of PACAP-38 on day 8 (8 hours post-dose). The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Respiratory Rate at Day 1, Day 8 and EOS
Respiratory rate was assessed during Part B of the study, and the mean change from baseline is presented for the last measurements taken following administration of placebo or erenumab on day 1 (1 hour post-dose), and following administration of PACAP-38 on day 8 (8 hours post-dose). The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Temperature at Day 1, Day 8 and EOS
Temperature was assessed during Part B of the study, and the mean change from baseline is presented for the last measurements taken following administration of placebo or erenumab on day 1 (1 hour post-dose), and following administration of PACAP-38 on day 8 (8 hours post-dose). The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Alkaline Phosphatase (ALP), Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) at Day 8, Day 9 and EOS
ALP, ALT and AST were assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Total Bilirubin at Day 8, Day 9 and EOS
Total bilirubin was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Blood Urea at Day 8, Day 9 and EOS
Blood urea was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Creatine Kinase at Day 8, Day 9 and EOS
Creatine Kinase was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Creatinine at Day 8, Day 9 and EOS
Creatinine was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Direct Bilirubin at Day 8, Day 9 and EOS
Direct bilirubin was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Eosinophil Count at Day 8, Day 9 and EOS
Eosinophil count was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Blood Glucose at Day 8, Day 9 and EOS
Blood glucose was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Mean Change From Baseline in Hemoglobin A1C (Fraction of 1) at Day 8, Day 9 and EOS
Hemoglobin A1C was assessed during Part B of the study, and the mean change from baseline is presented for samples taken prior to administration of PACAP-38 on day 8 (pre-PACAP-38 dose), and following administration of PACAP-38 on day 9. The mean change from baseline is also presented for the EOS assessment.
Pharmacokinetics (PK): Mean Erenumab Serum Concentration at 1 Hour (C1h)
The mean serum erenumab concentration at 1 hour post-dose on day 1 of Part B randomization phase is presented.
PK: Mean Area Under the Concentration-time Curve From Time 0 to 84 Days Post-dose (AUC84d)
The mean AUC84d for erenumab for the Part B randomization phase is presented.
Number of Participants With Anti-Erenumab Antibodies
Participants were tested for binding antibodies and neutralizing antibodies at baseline and following treatment with erenumab.
Number of Participants With Clinically Significant Changes in Electrocardiogram (ECG) Parameters
At baseline, 12-lead ECGs were performed in a standardized method, in triplicate, and approximately 30 seconds apart, prior to blood draws or other invasive procedures. Single ECGs were performed from Day 1 to EOS. ECG results were reviewed by the investigator and classified as: normal, abnormal not clinically significant or abnormal, clinically significant. The number of participants with abnormal, clinically significant changes in ECG results at EOS are presented.
Number of Participants With Clinically Significant Changes in Physical Parameters
Physical examinations were performed by an investigator and any abnormal findings, judged to be clinically significant were recorded as an AE. The number of participants with clinically significant changes in physical parameters at EOS are presented.
Number of Participants With Clinically Significant Changes in Neurological Assessments
Neurological examinations including assessment of cranial nerves, motor system, sensory system (including testing for pain sensation [pin prick], light touch sensation [brush], von Frey, and vibratory sense), reflexes, and cerebellar function were performed by the investigator and classified as normal or abnormal. Any abnormal findings, judged by the investigator to be clinically significant, were recorded as an AE. The number of participants with clinically significant changes in neurological assessments at EOS are presented.