COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn BHBH FPVFPV FLVFLV PVP-IPI REGNR2 LY-CoVLY RMDRMD
HCQ study #97 of 264
7/22 Late treatment study
Rivera et al., Cancer Discovery, doi:10.1158/2159-8290.CD-20-0941 (Peer Reviewed)
Utilization of COVID-19 Treatments and Clinical Outcomes among Patients with Cancer: A COVID-19 and Cancer Consortium (CCC19) Cohort Study
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Retrospective cancer patients, showing adjusted OR 1.03 [0.62-1.73] for HCQ. The study reports the number of HCQ+AZ patients but they do not provide results for HCQ+AZ (only HCQ + any other treatment). Significant confounding by indication and compassionate use is likely.

Rivera et al., 7/22/2020, retrospective, USA, North America, peer-reviewed, 45 authors.
risk of death, 2.4% higher, RR 1.02, p = 0.90, treatment 44 of 179 (24.6%), control 59 of 327 (18.0%), adjusted per study, odds ratio converted to relative risk.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
Details of all 264 studies    Meta analysis
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