You are presented with a paragraph from a COVID-19 literature. Classify the topics of this piece of text by choosing from the following categories:

- Epidemic Forecasting: The content relates to predictions about the spread of COVID-19.
- Treatment: The paragraph discusses therapeutic methods or medication for COVID-19.
- Prevention: The content covers measures to prevent the spread of COVID-19.
- Mechanism: The paragraph explains the biological mechanisms of the virus.
- Case Report: The content is a report of a COVID-19 case.
- Transmission: The paragraph discusses how COVID-19 is transmitted.
- Diagnosis: The content is about diagnosing COVID-19 in individuals.

Your classification should be provided as an element within a JSON array. The array should be formatted with topics enclosed in double quotes and separated by commas, following the JSON format, for example: ["Topic1", "Topic2", ...]. Include all applicable topics within the array. Your output should be a valid JSON array, and no additional text should be included in your response.

Article:

Since December 2019, the COVID-19 emerging pandemic caused by SARS-CoV-2 has resulted in one of the most important global health threats. Concerning the absence of an approved effective vaccine or drug for the treatment and outcome improvement of COVID-19 patients, and the role of SARS-CoV-2 in activation of mammalian target of rapamycin (mTOR) pathway, we decided to review the previous data regarding the therapeutic effect of mTOR inhibitor drugs in COVID-19 patients. We searched the scientific databases such as Web of Science, Embase, Medline (PubMed), Scopus, and Google Scholar using appropriate keywords to find suitable studies or suggestions until October 2020. The findings of the current study confirmed that mTOR inhibitor drugs through suggested mechanisms such as T cell adjustment, induction of autophagy without apoptosis, reduction of viral replication, restoration of the T-cell function, decrease cytokine storm, and moderation of the mTOR-PI3K-AKT pathway activation bring about a therapeutic impact in COVID-19 patients. Taken together, it is necessary to find a suitable therapy for the COVID-19 pandemic emerging. In this regard, we clarify that it is valuable to consider the therapeutic effect of mTOR inhibitor drugs and metformin by its mTOR inhibition property in the treatment of COVID-19 patients.
["Mechanism", "Treatment"]