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Add references that may not be interpreted correctly
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rando2 authored Feb 16, 2021
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##### Hydroxychloroquine and Chloroquine

CQ and hydroxychloroquine (HCQ) are lysosomotropic agents, meaning they are weak bases that can pass through the plasma membrane.
Both drugs increase cellular pH by accumulating in their protonated form inside lysosomes [@doi:10.1186/1743-422X-8-163; @doi:10.1111/j.1529-8019.2007.00131.x]. <!--Should have 1-2 sentences on what they’re approved for (malaria, lupus, rheumatoid arthritis) https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=34496b43-05a2-45fb-a769-52b12e099341 (look under “Indications and usage”) - descriptions of other treatments generally have this.-->
Both drugs increase cellular pH by accumulating in their protonated form inside lysosomes [@doi:10.1186/1743-422X-8-163; @doi:10.1111/j.1529-8019.2007.00131.x].
These drugs are used for the treatment and prophylaxis of malaria, as well as the treatment of lupus erythematosus and rheumatoid arthritis in adults [@url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=34496b43-05a2-45fb-a769-52b12e099341].<!--To Do: Check citation built-->
This shift in pH inhibits the breakdown of proteins and peptides by the lysosomes during the process of proteolysis [@doi:10.1111/j.1529-8019.2007.00131.x].
A number of mechanisms have been proposed through which these drugs could influence the immune response to pathogen challenge.
For example, CQ/HCQ can interfere with digestion of antigens within the lysosome and inhibit CD4 T-cell stimulation while promoting the stimulation of CD8 T-cells [@doi:10.1111/j.1529-8019.2007.00131.x].
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This study investigated whether HCQ decreased time to fever break or time to cough relief when compared to SOC [@doi:10.1101/2020.03.22.20040758].
This trial found HCQ decreased both average time to fever break and average time to cough relief, defined as mild or no cough.
While this study improved on some of the methodological flaws in Gautret et al. by randomizing patients, it also had several flaws in trial design and data analysis that prevent generalization of the results.
These weaknesses include the lack of placebo, lack of correction for multiple primary outcomes, inappropriate choice of outcomes, lack of sufficient detail to understand analysis, drastic disparities between pre-registration and published protocol, and small sample size. <!--What were these "drastic disparities?"-->
These weaknesses include the lack of placebo, lack of correction for multiple primary outcomes, inappropriate choice of outcomes, lack of sufficient detail to understand analysis, drastic disparities between pre-registration [@clinicaltrials:ChiCTR2000029559] and published protocol (including differences in the inclusion and exclusion criteria, the number of experimental groups, the number of patients enrolled, and the in the outcome analyzed), and small sample size.<!--To Do: Do Chinese clinical trial registry ids work? make sure this works at build.-->
The choice of outcomes may be inappropriate as both fevers and cough may break periodically without resolution of illness.
Additionally, for these outcomes, the authors reported that 23 of 62 patients did not have a fever and 25 of 62 patients did not have a cough at the start of the study, but the authors failed to describe how these patients were included in a study assessing time to fever break and time to cough relief.
It is important to note here that the authors claimed "neither the research performers nor the patients were aware of the treatment assignments."
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##### Dexamethasone

Dexamethasone (9&alpha;-fluoro-16&alpha;-methylprednisolone) is a synthetic corticosteroid that binds to glucocorticoid receptors [@doi:10.1021/cr068203e; @url:https://www.cebm.net/covid-19/dexamethasone/].
It was first synthesized in the late 1950s as an anti-inflammatory and has been used to treat RA and other inflammatory conditions [@doi:10.1021/ja01545a061; @doi:10.1001/jama.1960.03030070009002]. <!--Should also mention allergies and asthma. It actually has a wide number of listed uses on the label at https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=537b424a-3e07-4c81-978c-1ad99014032a (Under Indications and usage)-->
It was first synthesized in the late 1950s as an anti-inflammatory and has been used to treat RA and other inflammatory conditions [@doi:10.1021/ja01545a061; @doi:10.1001/jama.1960.03030070009002], including allergies and asthma [@url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=537b424a-3e07-4c81-978c-1ad99014032a]. <!--Should also mention allergies and asthma. It actually has a wide number of listed uses on the label at https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=537b424a-3e07-4c81-978c-1ad99014032a (Under Indications and usage)--><!--To Do: Check reference built correctly-->
Steroids such as dexamethasone are widely available and affordable, and they are often used to treat community-acquired pneumonia [@doi:10.1038/s41392-020-0127-9].
A clinical trial that began in 2012 recently reported that dexamethasone may improve outcomes for patients with ARDS [@doi:10/ggpxzc].
However, a meta-analysis of a small amount of available data about dexamethasone as a treatment for SARS suggested that it may, in fact, be associated with patient harm [@doi:10/ggks86]; these findings may have been biased by the fact that all of the studies examined were observational and a large number of inconclusive studies were not included [@doi:10/ggq356].
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TCZ is a receptor antibody that was developed to manage chronic inflammation caused by the continuous synthesis of the cytokine IL-6 [@doi:10.1101/cshperspect.a016295].
IL-6 is a pro-inflammatory cytokine belonging to the interleukin family, which is comprised by immune system regulators that are primarily responsible for immune cell differentiation.
Often used to treat conditions such as RA [@doi:10.1101/cshperspect.a016295], TCZ has become a pharmaceutical of interest for the treatment of COVID-19 because of the role IL-6 plays in this disease. <!--Probably want to mention it’s also approved to treat CRS caused by CAR-T treatments https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=2e5365ff-cb2a-4b16-b2c7-e35c6bf2de13 (under Indications and usage)-->
Often used to treat conditions such as RA [@doi:10.1101/cshperspect.a016295], TCZ has become a pharmaceutical of interest for the treatment of COVID-19 because of the role IL-6 plays in this disease.
It has also been approved to treat CRS caused by CAR-T treatments [@url:https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=2e5365ff-cb2a-4b16-b2c7-e35c6bf2de13].<!-- To Do: check reference built-->
While secretion of IL-6 can be associated with chronic conditions, it is a key player in the innate immune response and is secreted by macrophages in response to the detection of pathogen-associated molecular patterns and damage-associated molecular patterns [@doi:10.1101/cshperspect.a016295].
An analysis of 191 in-patients at two Wuhan hospitals revealed that blood concentrations of IL-6 differed between patients who did and did not recover from COVID-19.
Patients who ultimately deceased had higher IL-6 levels at admission than those who recovered [@doi:10/ggnxb3].
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