Proactive TDM Versus Standard Use of Biologics in Psoriasis (HELIOS)

Ghent University Hospital (UZ)

Status and phase: Enrolling; Phase 4

Conditions: Psoriasis Vulgaris

Treatments: Drug: Proactive TDM-based dosing of guselkumab; Drug: Proactive TDM-based dosing of secukinumab; Drug: Proactive TDM-based dosing of ixekizumab

Study type: Interventional

Funder types: Other

Identifiers

NCT06398106

ONZ-2024-0151

KCE-22-1375 (Other Grant/Funding Number)

2023-509637-39-00

Details and patient eligibility

About

Biologics are effective agents for the treatment of psoriasis. The newest generation of biologics block interleukin 17 and 23. Physicians always prescribe these drugs in a fixed dose, but this may lead to under- and overdosing in some patients. Underdosing may lead to inadequate response or loss of response over time. Overdosage, on the other hand, can lead to higher risk of side effects and higher costs for the healthcare system. In daily clinical practice, physicians often tackle this real-world issue by blind trial- and- error dose modifications or switching to another biologic. In this study, we want to rationalize these dose modifications and optimize dosing based on the drug concentrations, measured in the blood of the patient (i.e. therapeutic drug monitoring). Depending on the drug concentration, the interval between injections will be lengthened or shortened with the aim to reach the required drug concentration to reach the best clinical result. The trial will be conducted in 14 Belgian hospitals where patients will be divided into 2 study groups: a group that will be advised on the dosing scheme of their biologic based on the measured drug concentration and a group that continues dosing as in daily clinical practice. We will monitor if the clinical response and quality of life remains stable. With this study, we will track drug concentrations as we believe that they can guide dosing of biologics and we hope to achieve better safety, lower healthcare expenses and higher patients' treatment satisfaction while striving for the best clinical response.

Full description

Rationale:

Biologics are effective agents for the treatment of psoriasis. The newest generation of biologics block interleukin 17 and 23. Physicians always prescribe these drugs in a fixed dose, but this may lead to under- and overdosing in some patients. Underdosing may lead to inadequate response or loss of response over time. Overdosage, on the other hand, can lead to higher risk of side effects and higher costs for the healthcare system. In daily clinical practice, physicians often tackle this real-world issue by blind trial- and- error dose modifications or switching to another biologic. In this study, we want to rationalize these dose modifications and optimize dosing based on the drug concentrations, measured in the blood of the patient (i.e. therapeutic drug monitoring).

Objectives: The primary goal is to assess if proactive TDM is non-inferior compared to standard of care with respect to sustained disease control, defined as an absolute PASI ≤ 2 OR a delta PASI from baseline ≥ 50% during at least 80% of all 3-monthly study visits over a period of 18 months, in patients with moderate to severe psoriasis treated with novel biologics (secukinumab, ixekizumab or guselkumab). Secondary goals are:

To compare proactive TDM to standard of care with respect to disease activity, quality of life, treatment satisfaction and costs of treatment (cost-effectiveness) To identify baseline predictors for sustained disease control. To evaluate the cost-effectiveness of proactive TDM To evaluate the safety of proactive TDM.

Study design: A multicentre, pragmatic, randomised, controlled, non-inferiority trial.

Study population:

Patients with moderate-to-severe psoriasis, treated with secukinumab or ixekizumab (IL-17 inhibitors) or guselkumab (IL-23 inhibitor) in daily clinical practice for at least 6 months on standard dosing (maintenance phase). A total of 210 patients will be randomized (1:1) to the intervention group (TDM based dosing) or continuation of usual care.

Intervention: Stepwise treatment modifications based on drug levels: if the drug level is below/above the target, the dose of the biologic will be increased/decreased by stepwise interval shortening/lengthening - first modified by 33% and then 50% increase or decrease. If the target is still not reached at the next study visit, the dosing interval will be shortened or prolonged with one additional week at each additional visit until the target is reached.

In case the dosing regimen shifts from dose increase to dose decrease or vice versa, the dosing interval will be shortened or prolonged with one additional week at each additional visit until the target is reached.

Enrollment: 210 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Adults; aged 18 years or older
2. Documented diagnosis of psoriasis (predominantly type vulgaris; based on clinical diagnosis) by an accredited dermatologist
3. Patients must be currently treated with secukinumab, ixekizumab or guselkumab ≥ 6 months according to the standard dosing scheme.
4. The subject signs and dates a written informed consent form and any required privacy authorization prior to the initiation of any study procedures

Exclusion criteria

1. Another indication than plaque psoriasis as the main indication for biologic use (e.g. receives biologic for rheumatoid arthritis as the main indication)
2. Concomitant use of systemic immunosuppressants other than methotrexate or acitretin (e.g. prednisone, cyclosporine etc)
3. Severe comorbidities with short life-expectancy (e.g. metastasized tumour) or uncontrolled PsA at inclusion/baseline
4. Presumed inability to follow the study protocol
5. Active pregnancy wish

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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210 participants in 2 patient groups

Standard dosing of biologics

No Intervention group

Description:

Patients will receive biological therapy according to standard clinical practice. Secukinumab, ixekizumab and guselkumab will be administered according to standard dosing regimen. Adjustments in doses and intervals, or biological switch according to clinical parameters or at the physicians' discretion are considered as standard clinical practice. Investigators will not have access to information on levels of the drug or antidrug antibodies and no decision tree will be provided to guide treatment adjustments.

Proactive TDM based dosing

Experimental group

Description:

Stepwise treatment modifications based on drug levels: if the drug level is below/above the target the dose of the biologic will be increased/decreased by stepwise interval shortening/lengthening - first modified by 33% and then 50% increase or decrease. If the target is still not reached at the next study visit, the dosing interval will be shortened or prolonged with one additional week at each additional visit until the target is reached. In case the dosing regimen shifts from dose increase to dose decrease or vice versa, the dosing interval will be shortened or prolonged with one additional week at each additional visit until the target is reached.

Treatment:

Drug: Proactive TDM-based dosing of ixekizumab

Drug: Proactive TDM-based dosing of secukinumab

Drug: Proactive TDM-based dosing of guselkumab