Study to Demonstrate the Efficacy, Safety and Tolerability of Intravenous Secukinumab up to 52 Weeks in Subjects With Active Psoriatic Arthritis

Percentage of participants with active psoriatic arthritis (PsA) who achieved an American College of Rheumatology 50 (ACR50) response

The ACR50 is a composite measure defined as both improvement of 50% in the number of tender and number of swollen joints, and a 50% improvement in three of the following five criteria: patient global assessment, physician global assessment, functional ability measure [most often Health Assessment Questionnaire (HAQ)], visual analog pain scale, and erythrocyte sedimentation rate or C-reactive protein (CRP)

Percentage of participants with an American College of Rheumatology 20% (ACR20) response. A participant was a responder if the following 3 criteria for improvement from Baseline were met: • ≥ 20% improvement in 78 tender joint count; • ≥ 20% improvement in 76 swollen joint count; and • ≥ 20% improvement in at least 3 of the 5 following parameters: ◦ Patient's assessment of pain (measured on a 100 mm visual analog scale [VAS]); ◦ Patient's global assessment of disease activity (measured on a 100 mm VAS); ◦ Physician's global assessment of disease activity (measured on a 100 mm VAS); ◦ Patient's self-assessment of physical function (Health Assessment Questionnaire - Disability Index (HAQ-DI)); ◦ C-Reactive Protein.

MDA is assessed as 5 of the 7 following: ≤ 1 tender and swollen joint; entheseal count, PASI ≤ 1 or BSA ≤3%, PsA ≤ 15 and disease activity ≤ 20 (VAS) and HAQ-DI© ≤ 0.5

Change from baseline of a 90% reduction in the PASI score for patients with a >= 3% body surface area psoriasis at baseline. Four body surface areas are evaluated (head, trunk and upper and lower limbs) for plaque, erythema, scaling and thickness. The degree of severity of each sign in each of the 4 body areas was assigned a score of 0 to 4. Scores ranged from 0 to 72 and higher scores represent worsening severity.

PASDAS is a composite measure developed to assess disease activity in Psoriatic arthritis. It is calculated by utilizing seven measures: Patient reported measures (excluding mental component) (SF-36-PCS), skin, peripheral joint counts (tender and swollen joint counts), dactylitis (LDI), enthesitis (LEI), acute phase response (CRP), and patient and physician global VAS scores. The typical score range is between 0 and 10. Smaller values on PASDAS indicate a better condition; a negative change from baseline indicates improvement.

The Health Assessment Questionnaire - Disability Index is a patient-reported questionnaire consisting of 20 questions referring to eight domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and usual activities. Participants assessed their ability to do each task over the past week using the following response categories: without any difficulty (0); with some difficulty (1); with much difficulty (2); and unable to do (3). Scores on each task are summed and averaged to provide an overall score ranging from 0 to 3, where zero represents no disability and three very severe, high-dependency disability. Negative mean changes from Baseline in the overall score indicate improvement in functional ability.

The SF-36 is used to measure health-related quality of life with acute and chronic conditions. It consists of eight subscales that can be scored individually: Physical Functioning, Role-Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role-Emotional, and Mental Health. Range of scoring is 0 -100, with higher scores indicating better health status.

The FACIT-Fatigue is a 13 item questionnaire that assesses self-reported fatigue and its impact upon daily activities and function. Response scale ranges from 0-4 and the total score range is 0 - 52. Higher scores indicate better quality of life

The mNAPSI is an instrument to assess psoriatic nail involvement. Three groups of features (onycholysis and oil-drop dyshromia, pitting and crumbling) were graded on a scale from 0 to 3 for a total subscale of 0 to 9. The next 4 abnormalities (leukonychia, splinter hemorrhages, hyperkeratosis and red spots in the lunula) were graded as absent (0) or present (1) for a total subscale of 0 to 4. The total score was from 0-13 where higher scores represent worse nail disease.

Dactylitis is characterized by swelling of the entire finger or toe. The Leeds Dactylitis Index (LDI) measures the ratio of the circumference of the affected (swollen) digit. The ratio of circumference is multiplied by a tenderness score, using a modification of LDI that is a binary score (1 for tender, 0 for non-tender). The LDI requires a finger circumference gauge or a dactylometer to measure digital circumference. Scores range from 0 - 20 and lower score indicates better outcome.

Enthesitis is inflammation of the enthesis which is where a a tendon or ligament attaches to the bone. The Leeds enthesitis index (LEI) is a validated index that uses 6 sites for evaluation of enthesitis: lateral epicondyle humerus L + R, proximal achilles L + R and medial condyle femur L+R. If enthesitis is present at any of the 6 sites, the subject is counted as a subject with enthesitis.