Craving to Biologics Used in Severe Asthma

Craving to Biologics Used in Severe Asthma


Lead Sponsor: Medical Centre Leeuwarden

Source Medical Centre Leeuwarden
Brief Summary

Some patients treated with biologics for severe asthma experience a craving to the next biological administration. This phenomenon has never been described before. In this study, the researchers aim to further elucidate the feeling of needing the next administration of a biologic for severe asthma.

Detailed Description

Recent research by Kroes and colleagues on omalizumab levels has shown that approximately half of patients on long-term omalizumab therapy (>4 months) experience a subjective craving for the next dose. These patients had a need (Borg scale 3-10) for the next dose of biologic before the usual periodic dose, while other patients indicated that they had no or a low need (Borg scale 0-2) for the next dose at the usual dosing moment. This so-called 'craving' has not been described in the literature before. Patients in the high-requirement group had significantly lower median omalizumab trough levels than patients in the low-requirement group. There may be a relationship between blood levels of biologics and the need for the next dose. However, data is currently only available on the variability in serum trough levels of omalizumab, but not yet on the other biologics for asthma, some of which are administered as a fixed dose and some are dosed by body weight. No assays are currently available for blood level determinations from the other biologics. Before investigating the relationship between blood levels and the need for biologics, it is important to fully map the 'craving'. Some patients who are responders to biologic therapy based on improvements in clinical outcomes still do not have good enough control of their asthma and indicate that the dosing interval is not optimal. In addition to patients that indicate a need for the next dose, there are also patients that would like a longer dosing interval. To date, dosing interval adjustments have been made based on the patient's subjective experience and the physician's clinical judgment. This study investigates how big the problem of need for the next dose is, how patients experience this need, what this need exactly entails, whether this occurs more often in patients treated for a longer period and what possible problems patients experience in the treatment with biologics against serious problems.

Overall Status Recruiting
Start Date 2021-12-10
Completion Date 2022-08-01
Primary Completion Date 2022-07-01
Study Type Observational
Primary Outcome
Measure Time Frame
The prevalence of craving to the next biologic administration. 6 months
The character of craving to the next biologic administration. 6 months
Secondary Outcome
Measure Time Frame
Differences in craving (BORG-scale 0-10) between patients treated for more or less than 1 year. 6 months
Differences in craving (BORG-scale 0-10) between patients with different biologics. 6 months
Any other issues regarding the craving/administration of biologics for severe asthma, based on patient-level input from interviews. 6 months
Enrollment 150

Sampling Method:

Non-Probability Sample


Inclusion Criteria: - Treated with a biologic for severe asthma in the Medical Centre Leeuwarden for more than 4 months Exclusion Criteria: - Not speaking Dutch



Minimum Age:

18 Years

Maximum Age:


Healthy Volunteers:


Overall Contact

Last Name: Hans Kroes, MSc

Phone: +31582861837

Email: [email protected]

Facility: Status: Contact: Medical Centre Leeuwarden Hans Kroes, MSc +31582861837 [email protected]
Location Countries


Verification Date


Responsible Party

Type: Sponsor

Has Expanded Access No
Condition Browse
Arm Group

Label: Interview group

Description: A selection of patients will be interviewed, mapping the craving for the next biologic administration. These interviews will be used to develop a questionnaire to quantify the craving for the next administration in the total population.

Label: Questionnaire group

Description: The remaining patients will be asked to fill in a questionnaire, based on the interviews from Group 1.

Acronym CROCUS
Patient Data No
Study Design Info

Observational Model: Cohort

Time Perspective: Cross-Sectional

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