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April 6, 2020updated 12 Jul 2022 11:56am

Covid-19 delays enrolment for resTORbio’s Parkinson’s trial

resTORbio has put enrolment for the fifth cohort of RTB101’s Phase Ib/IIa Parkinson’s disease (PD) trial on hold amid the Covid-19 (coronavirus) pandemic.

resTORbio has put enrolment for the fifth cohort of RTB101’s Phase Ib/IIa Parkinson’s disease (PD) trial on hold amid the Covid-19 (coronavirus) pandemic.

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The company attributed the patient recruitment delay to the level 4 alert issued in New Zealand, where the trial is being conducted. This alert calls for the closure of all non-essential services and the self-isolation of people at home.

resTORbio co-founder and chief medical officer Dr Joan Mannick said: “We want to ensure the safety of our clinical trial participants, many of whom are older adults at high risk of Covid-19 morbidity and mortality.

“Therefore, we have postponed enrollment in the fifth cohort of our ongoing Phase Ib/IIa clinical trial of RTB101 in patients with PD. Enrolment in the first four cohorts has been completed, and we are actively monitoring the situation in New Zealand so that we may resume our clinical activity when the time is appropriate.”

RTB101 is an oral, small molecule candidate designed to inhibit the target of rapamycin complex 1 (TORC1) when given as a monotherapy or in combination with sirolimus.

The multi-centre, randomised, double-blind, placebo-controlled Phase Ib/IIa trial is being conducted to assess the safety and tolerability of RTB101 alone and with escalating sirolimus doses in Parkinson’s disease patients.

In February this year, resTORbio reported positive findings from three cohorts in the trial. Participants were treated with 300mg RTB101 alone, 2mg of sirolimus alone, or 300mg of RTB101 plus 2mg of sirolimus.

According to the results, the three dosing regimens were well-tolerated and the 300mg once-weekly dose crossed the blood-brain barrier.

RTB101 concentrations in cerebrospinal fluid (CSF) in patients administered with a 300mg dose were higher when compared to preclinical models. These concentrations are believed to have the potential to trigger autophagy in the brain.

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