Dr Tess Lawrie writes to Professor Chris Butler requesting the interim results of the trial which as been paused due to ‘supply issues’
Dear Professor Butler
PRINCIPLE: request for interim data on “paused” ivermectin arm
We note from press reports and the PRINCIPLE website that the ivermectin “arm” of
PRINCIPLE is “currently paused due to temporary supply issues”.
We are updating our Systematic Review and Meta-Analysis of ivermectin in Covid-19
(Am. J. Therap. 28, e434-e460) and should like to request your interim results as at the
“pause” point, ideally via de-identified Individual Participant Data (IPD).
You may be aware of recent critiques of meta-analyses based on summary data only
(e.g. Lawrence et al. Nat. Med. 27(11), 1853). There is growing advocacy elsewhere for
access to de-identified IPD for all clinical trials.
Although meta-analyses based on IPD are considerably more laborious than those based
on summary data, it is clear that new standards are being called for.
As a large and visible clinical trial of ivermectin, we should like to request interim results
for the ivermectin and control arms and de-identified IPD for inclusion in our updated
Please let us know your terms and data protection requirements for release of your deidentified
Theresa A Lawrie MB BCh PhD
EbMCsquared, Northgate House, Upper Borough Walls, Bath BA1 1RG
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