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All Studies   Meta Analysis   Recent: 
0 0.5 1 1.5 2+ Case -56% Improvement Relative Risk c19hcq.org Laplana et al. HCQ for COVID-19 PrEP Favors HCQ Favors control
Lack of protective effect of chloroquine derivatives on COVID-19 disease in a Spanish sample of chronically treated patients
Laplana et al., PLOS ONE, doi:10.1371/journal.pone.0243598
9 Sep 2020    Source   PDF   Share   Tweet
Survey of 319 autoimmune disease patients taking CQ/HCQ with 5.3% COVID-19 incidence, compared to a control group from the general population (matched on age, sex, and region, but not adjusted for autoimmune disease), with 3.4% incidence.
It not clear why authors did not compare with autoimmune patients not on CQ/HCQ. Other research shows that the risk of COVID-19 for systemic autoimmune disease patients is much higher overall, Ferri et al. show OR 4.42, p<0.001 [Ferri], which is the observed real-world risk, taking into account factors such as these patients potentially being more careful to avoid exposure. If we adjust for the different baseline risk, the result becomes RR 0.36, p<0.001, suggesting a substantial benefit for HCQ/CQ treatment (as shown in other studies).
There may also be significant survey bias - those experiencing COVID-19 may be more likely to respond to the survey.
Authors note that they "could not eliminate completely the possibility of some bias due to the intrinsic condition of the individuals within the treatment group that are undergoing chloroquine or derivative drug treatment due to other diseases that alter their health status and may have different comorbidities", however they could account for one significant bias by comparing with matched autoimmune disease patients.
risk of case, 56.0% higher, RR 1.56, p = 0.24, treatment 17 of 319 (5.3%), control 11 of 319 (3.4%).
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
This study is excluded in the after exclusion results of meta analysis: not fully adjusting for the different baseline risk of systemic autoimmune patients.
Laplana et al., 9 Sep 2020, retrospective, Spain, peer-reviewed, survey, 3 authors.
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