Association of chronotype and timing of interferon injection with severity of IFNβ-induced flu-like syndrome in Multiple sclerosis (MS) patients.

BACKGROUND

Although Interferon-beta (IFNβ) has long been approved as a disease-modifying therapy (DMT) for Multiple sclerosis (MS), flu-like syndrome (FLS) persists as a common adverse effect of interferon therapy. Given the importance of circadian rhythm in regulating physiological processes, we aimed to assess the relationship between patient's chronotype and time of interferon injection with FLS score in MS patients receiving IFNβ.

METHODS

A cross-sectional study was conducted on 118 MS patients who were referred to the clinic of neurology of Zanjan Vali-e-Asr Hospital for interferon injection. The included were invited to complete a morningness-eveningness questionnaire (MEQ) assessing patients' chronotype. The following data were extracted from patients' record: age, gender, duration of interferon treatment, type of interferon taken, time of interferon injection (morning/evening), FLS score, MS subtype, and usage of pain killers. All data found were imported and statistically analyzed in SPSS ver.26.

RESULTS

According to the patients' record, 114 (96.6%) patients had experienced post-interferon injection FLS with different severities. Statistical analysis revealed no significant relationship between the patient's chronotype and FLS score. Nevertheless, the FLS score was significantly higher in those who had evening injections.

CONCLUSIONS

Time of interferon injection was significantly associated with FLS score, with higher FLS score following evening injection. However, no significant relationship was found between the FLS score and the patient's chronotype. It is recommended that further studies assessing circadian rhythm using laboratory tests such as melatonin measurement need to be undertaken to investigate the association of circadian rhythm with post-interferon injection FLS.