Your goal is to extract structured information from the user's input that matches the form described below. When extracting information please make sure it matches the type information exactly. Do not add any attributes that do not appear in the schema shown below.

```TypeScript

 { // Information on the clinical trial characteristics from the abstract
 conditions: string // The condition or disease being treated in the clinical trial
 drug_or_intervention: string // The drug or intervention used in the clinical trial
}
```


Please output the extracted information in JSON format. Do not output anything except for the extracted information. Do not add any clarifying information. Do not add any fields that are not in the schema. If the text contains attributes that do not appear in the schema, please ignore them. All output must be in JSON format and follow the schema specified above. Wrap the JSON in <json> tags.



Input:Efficacy and safety of ustekinumab, a human interleukin-12/23 monoclonal antibody, in patients with psoriasis: 52-week results from a randomised, double-blind, placebo-controlled trial (PHOENIX 2).  Ustekinumab, a human monoclonal antibody against interleukins 12 and 23, has shown therapeutic potential for psoriasis. This study assessed the efficacy and safety of ustekinumab in psoriasis patients and assessed dosing intensification in partial responders. In this multicentre, phase III, double-blind, placebo-controlled study, 1230 patients with moderate-to-severe psoriasis (defined by a psoriasis area and severity index [PASI] score > or =12, and at least 10% total body surface area involvement) were randomly assigned to receive ustekinumab 45 mg (n=409) or 90 mg (n=411) at weeks 0 and 4, then every 12 weeks, or placebo (n=410). Partial responders (ie, patients achieving > or =50% but <75% improvement from baseline in PASI) were re-randomised at week 28 to continue dosing every 12 weeks or escalate to dosing every 8 weeks. Both randomisations were done with a minimisation method via a centralised interactive voice response. The primary endpoint was the proportion of patients achieving at least 75% improvement in PASI (PASI 75) at week 12. Analyses were by intention to treat. This study is registered with ClinicalTrials.gov, number NCT00307437. All randomised patients were included in the efficacy analysis. 273 (66.7%) patients receiving ustekinumab 45 mg, 311 (75.7%) receiving ustekinumab 90 mg, and 15 (3.7%) receiving placebo achieved the primary endpoint (difference in response rate 63.1%, 95% CI 58.2-68.0, p<0.0001 for the 45 mg group vs placebo and 72.0%, 67.5-76.5, p<0.0001 for the 90 mg group vs placebo). More partial responders at week 28 who received ustekinumab 90 mg every 8 weeks achieved PASI 75 at week 52 than did those who continued to receive the same dose every 12 weeks (22 [68.8%] vs 11 [33.3%]; difference in response rate 35.4%, 95% CI 12.7-58.1, p=0.004). There was no such response to changes in dosing intensity in partial responders treated with ustekinumab 45 mg. During the placebo-controlled phase, 217 (53.1%) patients in the 45 mg group, 197 (47.9%) in the 90 mg group, and 204 (49.8%) in the placebo group experienced adverse events; serious adverse events were seen in eight (2.0%) patients in the 45 mg group, five (1.2%) in the 90 mg group, and eight (2.0%) in the placebo group. Although treatment with ustekinumab every 12 weeks is effective for most patients with moderate-to-severe psoriasis, intensification of dosing to once every 8 weeks with ustekinumab 90 mg might be necessary to elicit a full response in patients who only partially respond to the initial regimen. Output:

conditions: Psoriasis
interventions: Drug: Placebo; Ustekinumab (CNTO 1275) 45 or 90 mg|Drug: Ustekinumab (CNTO 1275) 45 mg|Drug: Ustekinumab (CNTO 1275) 90 mg