RE: P3 trial - Read between the lines31 Jul 2020 13:54
RNS 18 March 2020: "Synairgen plc (LSE: SNG), the respiratory drug discovery and development company, today announces that it has received expedited approvals.. to conduct a trial of SNG001 (inhaled formulation of interferon-beta-1a) in COVID-19 patients."
Note the SNG001 (inhaled FORMULATION of interferon-beta-1a).
"Synairgen's SNG001 is a formulation of IFN-beta-1a for direct delivery to the lungs via nebulisation.
It is pH neutral, and is free of mannitol, arginine and human serum albumin, making it suitable for inhaled delivery direct to the site of action."
New Trial ACTT-3:
..will evaluate the combination of interferon beta-1a (administered intravenously) and remdesivir compared to remdesivir alone.
The marvellous SNG001 efficacy reported in the phase 2 results reported recently is I believe not 100% attributable to the use of interferon-beta-1a alone.
1 There is a factor in the success reported that is attributable to the use of the specific nebuliser to treat lung infection directly.
2 Another factor in the success reported is the presence of other materials beside interferon-beta-1a (the FORMULATION).
I assume if the FORMULATION were to contain active drugs it would have to be listed beside interferon-beta-1a, so I'm assuming it is ONLY to aid the job of interferon. Thanks for your post SalaciousC.
The ACTT-3 trial uses intraveneous injections, not a nebuliser, so they are not treating the site of infection directly.
The trial just adds interferon beta 1a to remdesivir to observe improvement.
Also as pointed out by Joey Diamond:
"The study will compare different investigational therapeutic agents to a control arm. New arms can be introduced according to scientific and public health needs. There will be interim monitoring to allow early stopping for futility, efficacy, or safety. If one therapy proves to be efficacious, then this treatment may become the control arm for comparison(s) with new experimental treatment(s).
The Primary outcomes are dissimilar:
Primary Outcome Measures SNG001 - phase 2:
Ordinal Scale for Clinical Improvement [Time Frame: Day 1 to day 28]
Change in condition measured using the Ordinal Scale for Clinical Improvement during the dosing period - minimum of 0 (patient is well) to a maximum of 8 (death)
Primary Outcome Measures ACTT-3 - phase 3:
Time to recovery [Time Frame: Day 1 through Day 29]
Day of recovery is defined as the first day on which the subject satisfies one of the following three categories from the ordinal scale: 1) Hospitalized, not requiring supplemental oxygen and no longer requires ongoing medical care; 2) Not hospitalized, limitation on activities and/or requiring home oxygen; 3) Not hospitalized, no limitations on activities.
ACTT-3 may lead down many paths of exploration, which might provide many reasons to delay the end date IMO.