Study to Evaluate the Effect of Erenumab on Blood Pressure When Given Concomitantly With Subcutaneous Sumatriptan

Mean arterial pressure (MAP) is the average arterial pressure during a single cardiac cycle. MAP was calculated as diastolic blood pressure (DBP) + 0.33 * (systolic blood pressure [SBP]-DBP). Individual time-weighted average in MAP were calculated as area under the measurement-time curve from predose through 2.5 hours of MAP divided by the time period over which the measurements were made (ie, AUCmap0-2.5 hr /2.5 hours).

Data were analyzed using a linear mixed effects regression model with fixed effects for treatment and period and random effect for subject; Sumatriptan Alone data include participants from both Groups A (Parts 1 and 2) and B (Part 1 only).

Adverse events (AEs) were graded according to the Common Terminology Criteria for Adverse Events (CTCAE) version 4.0 and according to the following:

Grade 1 = Mild AE, asymptomatic or mild symptoms; Grade 2 = Moderate, minimal, local or noninvasive intervention indicated; Grade 3 = Severe or medically significant but not immediately life-threatening; Grade 4 = Life-threatening consequences, urgent intervention indicated; Grade 5 = Death related to AE.

Plasma concentrations of sumatriptan were quantified using a validated high performance liquid chromatographic method with tandem mass spectrometry detection.

Area under the plasma concentration-time curve from time 0 to 6 hours post dose (AUC6hr) after the 2nd 6 mg dose of sumatriptan was estimated using the linear trapezoidal method. Sumatriptan plasma concentrations below the lower limit of quantification (LLOQ; 0.100 ng/mL) were set to 0 before data analysis.

Log-transformed AUC6hr was analyzed using a linear mixed effects model with treatment as a fixed effect and subject as a random effect.

Sumatriptan Alone data include participants from both Groups A (Parts 1 and 2) and B (Part 1 only).

Plasma concentrations of sumatriptan were quantified using a validated high performance liquid chromatographic method with tandem mass spectrometry detection. The area under the plasma concentration-time curve from time 0 to infinity (AUCinf) after the 2nd 6 mg dose of sumatriptan was estimated as the sum of AUClast and Clast/λz where Clast is the last observed concentration and λz is the first-order terminal rate constant estimated via linear regression of the terminal log-linear decay phase. Sumatriptan plasma concentrations below the lower limit of quantification (LLOQ) (0.100 ng/mL) were set to 0 before data analysis.

Log-transformed AUCinf was analyzed using a linear mixed effects model with treatment as a fixed effect and subject as a random effect. Sumatriptan Alone data include participants from both Groups A (Parts 1 and 2) and B (Part 1 only).

Plasma concentrations of sumatriptan were quantified using a validated high performance liquid chromatographic method with tandem mass spectrometry detection. Sumatriptan plasma concentrations below the lower limit of quantification (LLOQ) (0.100 ng/mL) were set to 0 before data analysis.

Log-transformed maximum observed plasma concentration (Cmax) was analyzed using a linear mixed effects model with treatment as a fixed effect and subject as a random effect. Sumatriptan Alone data include participants from both Groups A (Parts 1 and 2) and B (Part 1 only).

Two validated assays were used to detect the presence of anti-erenumab antibodies. All samples were first tested in an electrochemiluminescence-based bridging assay to detect antibodies capable of binding to erenumab (Binding Antibody Assay). Samples confirmed to be positive for binding antibodies were subsequently tested in a cell-based assay to determine neutralizing activity against erenumab (Neutralizing Antibody Assay). If a post-dose sample was positive for binding antibodies and demonstrated neutralizing activity at the same time point, the sample was defined as positive for neutralizing antibodies.

Binding/neutralizing antibody positive is defined as participants with an antibody positive postbaseline results and with a negative or no result at baseline.