In all viral infections, like corona virus disease including COVID-19, the infected cell relies on immune responses to restrict the transfection of healthy cells by the virus. One of the first cytokines that is produced by infected cells is the type I interferon (interferon beta). Due to the reported efficacy of interferon beta in SARS-CoV [5] and its mechanism of action, different clinical trials using interferon beta were conducted worldwide. Based on the evidence, which supports efficacy of interferon beta-1a in COVID-19, clinical trials with ReciGen (interferon beta-1a, CinnaGen) were designed and conducted in multiple centres in Iran.

In the first clinical trial published by Payandemehr et al. [6], the efficacy and safety of ReciGen were evaluated in 20 patients who had confirmed cases of COVID-19 and were treated by this product in combination with the current local COVID-19 protocol for 5 consecutive days. It was observed that the median (interquartile range) hospitalization duration was 5.0 (3–6) days and 15 (94%) patients reported good general health condition 5 days after discharge without any lasting significant complaints. Likewise, no case of re-admission or death was reported after discharge. These results verified the efficacy of ReciGen to improve the health and reduce the hospitalization time of patients with an acceptable safety profile.

The next study that evaluated the efficacy and safety of ReciGen in COVID-19 patients was published by Davoudi-Monfared et al. [7]. In this study, 92 patients were enrolled and 42 patients received interferon beta-1a along with the current national protocol medications and 39 patients received only the current national protocol medications as a control group and completed the study. Results of the study revealed that treatment with ReciGen significantly reduced the 28-day overall mortality (p = 0.015) compared to the control group and early administration was one of the main factors to increase the efficacy of treatment with ReciGen. Moreover, addition of this product to the treatment protocol, lead to less hospitalization time in the treatment group compared to the control group.

The next study that reported the efficacy of ReciGen was published by Dastan et al. [8]. In this prospective trial, 20 COVID-19 confirmed patients were treated by conventional treatment protocol including ReciGen. The results of the study including lung computed tomography (CT) and chest X-ray illustrated the significant efficacy of ReciGen in combination with conventional treatment in improving the health of patients. In addition, during the 4-day study period, no case of death or significant adverse drug reactions were reported and symptoms of disease including cough, dyspnea and myalgia decreased gradually.

Finally, in a recent article, Baghaei et al. [9] reported the efficacy evaluation of ReciGen in 456 COVID-19 patients (152 interferon beta-1a group and 304 control group) in a randomized, double-arm study. The group treated with interferon beta-1a resulted in a good prognosis and had a lower mortality rate. The interferon beta-1a-treated group had less mortality (at least five times) than the control group, which was significant (p < 0.001) when considering oxygen support and treatment-improved oxygen support.

In conclusion, overall, 588 patients with confirmed COVID-19 were enrolled in these studies. The results verified the lower hospitalization time, improved prognosis and lower mortality rate for patients treated with ReciGen. This was in accordance with the results of other clinical trials which evaluated the efficacy of interferon beta-1a with different doses and routes of administration, such as inhaled nebulised interferon beta-1a [1].

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References
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