Apremilast Pediatric Study in Children With Active Oral Ulcers Associated With Behçet's Disease

Pain of oral ulcers will be measured by a visual analog scale (VAS). The participants will be asked to place a vertical line on a 100 mm VAS at the point that represents the severity of oral ulcer pain. The scale will range from "no pain" (left hand boundary) to "worst possible pain" (right hand boundary).

Complete response rate for oral ulcers is defined as the proportion of participants who are oral ulcer free at Week 12.

Complete response rate for genital ulcers is defined as the proportion of participants (with genital ulcers at week 0) who are genital ulcer free at Week 12.

Disease activity is measured by Behçet's Disease Current Activity (BDCAF) scores. The BDCAF consists of 3 component scores: the Behçet's Disease Current Activity Index (BDCAI) score, the Patient's Perception of Disease Activity, and the Clinician's Overall Perception of Disease Activity. The BDCAI score ranges from 0 to 12. A higher score indicates higher level of disease activity (worsening), and a negative change from baseline indicates improvement. The Patient's Perception of Disease Activity and the Clinician's Overall Perception of Disease Activity were assessed by the subject and the clinician, respectively, using a scale of 1 to 7, where a higher score indicates a higher level of disease activity.

The SF-10 Health Survey for Children is a parent-completed survey that contains 10 questions adapted from the Child Health Questionnaire. The SF-10 is intended to produce physical and psychosocial health summary measures. Each of the 10 questions responses is scored with a point value from 1 to 6 (1 is the worst possible condition and 6 is the best possible condition). The SF-10 physical and psychosocial measures are scored such that higher scores indicate more favorable functioning.

The C-SSRS is an assessment tool that evaluates suicidal ideation and behavior. Number of participants with suicidal ideation or behavior is defined as the number of participants who answer "yes" at any time during the study (up to end of safety follow-up, Week 56) to one of the 10 categories:

Category 1: Wish to be dead Category 2: Non-specific active suicidal thoughts Category 3: Active suicidal ideation with any methods (not plan) without intent to act Category 4: Active suicidal ideation with some intent to act, without specific plan Category 5: Active suicidal ideation with specific plan and intent Category 6: Preparatory acts or behavior Category 7: Aborted attempt Category 8: Interrupted attempt Category 9: Actual attempt (non-fatal) Category 10: Completed suicide

Tanner Staging of sexual development assessment will be used to assess sexual maturity. Tanner Staging assessment consists of 3 domains (pubic hair, breast development, and other changes) for girls and 4 domains (pubic hair, penis development, testes development, and other changes) for boys. Stages range from 1-5, with 1 indicating preadolescent and 5 adult.

BMI assessed as weight/(height/100)^2

Taste and acceptability will be assessed using a questionnaire with a 7-point faces Likert Scale, with 1 ranging from "super bad" to 7 "super good" and questions to determine whether the participants are able to take the treatment medication.