All patients who administrated ENBREL for active polyarticular juvenile idiopathic arthritis during registered period (2.5 year).

All patients who administrated ENBREL for active polyarticular juvenile idiopathic arthritis (restricted to the case of lack of effect by other treatment) during registered period (2.5 year).

Adverse events are all unfavorable events, including clinically problematic abnormal changes in laboratory test values, which develop in participants after the administration of Etanercept, irrespective of causal relationship to Etanercept. The causal relationship between an adverse event and Etanercept was evaluated by the sponsor.

Serious treatment-related adverse events are defined as any events that lead to death, life-thretening, hospitalization or prolonged hospitalization, a permanent or remarkable disorder/dysfunction, congenital anormaly/congenital deficiency, or other medically significant events or disorder.

Adverse events are all unfavorable events, including clinically problematic abnormal changes in laboratory test values, which develop in participants after the administration of Etanercept, irrespective of causal relationship to Etanercept. The causal relationship between an adverse event and Etanercept was evaluated by the sponsor. Unlisted treatment-related adverse events were confirmed with listed adverse drug reactions specified in Japanese package insert.

The Disease Activity Score Based on 28-joints Count based (DAS28-based) EULAR response criteria were used to measure individual response as none, good, and moderate, depending on the extent of change from baseline and the level of disease activity reached. Good responders: change from baseline >1.2 with DAS28 =< 3.2; moderate responders: change from baseline >1.2 with DAS28 >3.2 or change from baseline >0.6 to =<1.2 with DAS28 =<5.1; non-responders: change from baseline =< 0.6 or change from baseline >0.6 and =<1.2 with DAS28 >5.1.

Percentage of participants in whom the efficacy of etanercept was assessed as either markedly effective or effective.

Participants with polyarticular juvenile idiopathic arthritis (JIA) who received 10 mg or 25 mg lyophilized etanercept (genetical recombination) for subcutaneous injection.

Adverse events are all unfavorable events, including clinically problematic abnormal changes in laboratory test values, which develop in participants after the administration of Etanercept, irrespective of causal relationship to Etanercept. The causal relationship between an adverse event and Etanercept was evaluated by the sponsor.

The safety analysis population consisted of the participants who received 10 mg or 25 mg lyophilized etanercept (genetical recombination) for subcutaneous injection indicated for polyarticular JIA after the marketing authorization had been granted.

Participants with polyarticular juvenile idiopathic arthritis (JIA) who received 10 mg or 25 mg lyophilized etanercept (genetical recombination) for subcutaneous injection.