There were many remdesivir trials, but one of them is a good example of comparing one treatment against another to determine the odds ratios associate with one treatment being more effective and/or less risky than the other.
In the both Anavex AD trials patients are allowed to remain on SOC and here A2-73 has the extra challenge of beating placebo when SOC is also distributed in the mix of both placebo and treatments arms.
It is quite common in standard RCTs to allow SOC, but SOC does not change the nature of what is being tested and are not comparable to the correct use of Odds Ratios as in the above remdesivir trial.
The different purposes of a clinical trial and the appropriate use of Odds Ratios is key to appreciate why biotech investors and the market is currently not valuing $AVXL higher.
OR is a valid endpoint for binary outcomes such as cure rate or infection rate for antiviral or vaccine. If performed for near continuous outcomes like ADAs-Cog or CDR-SB, it is typically a supplementary analysis of the outcome/scale not the primary endpoint.