Study of the Efficacy and Safety of Secukinumab in Participants With Active Psoriatic Arthritis With Axial Skeleton Involvement

Purpose of this measure: was to demonstrate that secukinumab 150 mg s.c. is superior to placebo in the achievement of ASAS 20 response at Week 12 after superiority of 300 mg was established

ASAS20 was defined as an improvement of ≥20% and absolute improvement of ≥10 unit (0-100 mm VAS) from baseline in ≥3 of the following 4 domains (and absence of deterioration in any domain): patient's global assessment of disease activity (PTGA), pain assessment (total pain score), Bath Ankylosing Spondylitis Functional Index (BASFI), and clinical inflammation (mean of 2 morning stiffness-related scores on the BASDAI)

Purpose of this key secondary measure: was to demonstrate that secukinumab 150 mg s.c. is superior to placebo in the achievement of ASAS 20 response at Week 12 after superiority of 300 mg was established. 300mg and 150mg are presented side by side for clarity; and to align with protocol. 300mg data is for Primary outcome; and 150mg data is for key secondary outcome

ASAS20 was defined as an improvement of ≥20% and absolute improvement of ≥10 unit (0-100 mm VAS) from baseline in ≥3 of the following 4 domains (and absence of deterioration in any domain): patient's global assessment of disease activity (PTGA), pain assessment (total pain score), Bath Ankylosing Spondylitis Functional Index (BASFI), and clinical inflammation (mean of 2 morning stiffness-related scores on the BASDAI)

Proportion of patients with response to treatment as assessed by the Assessment of spondyloarthritis international society (ASAS) 40 criteria at week 12.

ASAS40 was defined as an improvement of ≥40% and absolute improvement of ≥20 unit (0-100 mm VAS) from baseline in ≥3 of the following 4 domains (and absence of deterioration in any domain): patient's global assessment of disease activity (PTGA), pain assessment (total pain score), Bath Ankylosing Spondylitis Functional Index (BASFI), and clinical inflammation (mean of 2 morning stiffness-related scores on the BASDAI)

Bath ankylosing spondylitis disease activity index (BASDAI) 50 response

BASDAI 50 response is defined as at least 50% improvement (decrease) in total BASDAI score.

Change from baseline in Spinal pain visual analog scale (VAS) at week 12

VAS is a straight horizontal line of fixed length, usually 100 mm. The ends are defined as the extreme limits of the parameter to be measured (symptom,pain,health) orientated from the left (worst) to the right (best).

VAS measures pain and stress for on a horizontal line of 100 mm, ranging from very low (0) to very high (100).

Change from baseline in Spinal pain visual analog scale (VAS) at week 12

VAS is a straight horizontal line of fixed length, usually 100 mm. The ends are defined as the extreme limits of the parameter to be measured (symptom,pain,health) orientated from the left (worst) to the right (best).

VAS measures pain and stress for on a horizontal line of 100 mm, ranging from very low (0) to very high (100)

The Spondyloarthritis Research Consortium of Canada (SPARCC) enthesitis index score range is 0-16, where 0 is the best outcome, and 16 the worst. The assessor determines whether the site shows tenderness and therefore would count as site with enthesitis. This is done by applying pressure to the site and getting feedback from patient about whether the site is tender.

The health assessment questionnaire disability index (HAQ-DI) assesses the difficulty a patient has had in the past week in 8 domains of daily living activities: dressing and grooming, arising, eating, walking, hygiene, reach, grip, and other activities. Each activity category consists of 2-3 items. For each question, level of difficulty is scored from 0 to 3 with 0=no difficulty, 1=some difficulty, 2=much difficulty, and 3=unable to do. The score for each domain is the maximum (worst) score from the items/questions within the domain. Higher score indicates greater disability. Overall score was computed as the sum of the domain scores divided by the number of domains answered. The total possible score ranged from 0 to 3 where 0 = least difficulty and 3 = extreme difficulty. Higher overall score indicates greater disability.

The FACIT-fatigue scale is a 13-item patient-reported measure of fatigue with a 7-day recall period. Items are scored on a 0 - 4 response scale with anchors ranging from "Not at all" to "Very much so". To score the FACIT-fatigue, all items are summed to create a single fatigue score with a range from 0 to 52.

Statistical analysis (using ANCOVA) of change from baseline in spondyloarthritis international society (ASAS) Health Index score by visit - treatment period 1

ASAS HI is a disease-specific health-index instrument designed to assess the impact of interventions for SpA, including axSpA. The 17-item instrument has scores ranging from 0 (good health) to 17 (poor health). Each item consists of one question that the participant needs to respond to with either "I agree" (score of 1) or "I do not agree" (score of 0). A score of "1" is given where the item is affirmed, indicating adverse health. All item scores are summed to give a total score or index.

LSMean was calculated using MMRM model with treatment, geographic region, baseline CRP status, baseline value, visit, baseline value-by-visit, and treatment-by-visit interaction as fixed factors

American College of Rheumatology 20% (ACR20) Response at Week 12 is the % of responders with at least 20% improvement from Baseline for tender joint count (TJC), swollen joint count (SJC), and at least 3 of the 5 remaining core set measures: 1)Health Assessment Questionnaire-Disability Index (HAQ-DI), 2)C-reactive Protein (CRP), 3) Patient's Assessment of Arthritis Pain-Visual Analog Scale (PAAP-VAS), 4) Patient's Global Assessment of Disease Activity-Visual Analog Scale (PtGADA-VAS), 5) Physician's Global Assessment of Disease Activity-Visual Analog Scale (PhGA-VAS)