On April 3, 2020, resTORbio, Inc. (the Company) issued a press release to announce that it will postpone enrollment in the fifth cohort of its
ongoing Phase 1b/2a trial of RTB101, an orally administered, small molecule product candidate that is a potent target inhibitor of rapamycin complex (TORC1), alone or in combination with sirolimus, in Parkinsons disease (PD). The trial is
being conducted at clinical sites in New Zealand and the enrollment delay is a consequence of the COVID-19 level 4 alert in New Zealand, where all non-essential services
have been closed and people have been instructed to stay home.
Phase 1b/2a Trial of RTB101 alone and in combination with sirolimus in Parkinsons
disease study results
The multicenter, 2:1 randomized, double-blind, placebo-controlled Phase 1b/2a trial is evaluating the safety and tolerability of
RTB101 alone or in combination with escalating doses of sirolimus (2 mg, 4 mg and 6 mg) once weekly for 4 weeks in patients with Parkinsons disease. To date, patients have been enrolled in four cohorts and dosed once weekly with 300 mg of
RTB101 alone, 2 mg of sirolimus alone, a combination of 300 mg RTB101 and 2 mg of sirolimus, or a combination of 300 mg RTB101 and 4 mg of sirolimus. Results of the interim study analysis after the first 3 cohorts indicated that all 3 dosing
regimens were well tolerated and RTB101 300 mg once weekly was observed to cross the blood brain barrier. The concentrations of RTB101 in cerebrospinal fluid (CSF) in subjects dosed with RTB101 300 mg once weekly monotherapy were higher than
expected and based on preclinical models, have the potential to induce autophagy in the brain. Sirolimus at the dose of 2 mg, alone or in combination with RTB101, was not detected in the CSF. Data from the first three cohorts in the study suggest
that the concentrations of RTB101 observed in the CSF four hours after dosing were highest when RTB101 was given as a monotherapy. Enrollment and dosing of the RTB101 300 mg in combination with sirolimus 4 mg once weekly cohort has been completed.
Forward Looking Statements
This Form 8-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including, but not limited to, statements regarding: our expectations of the potential
impact of COVID-19 on strategy, future operations, and the timing of its clinical trials and specifically the enrollment of the fifth cohort in our ongoing Phase 1b/2a trial; the safety, efficacy and
regulatory and clinical progress of our product candidates, including RTB101 alone or in combination with sirolimus. Investors are cautioned that statements in this Form 8-K which are not strictly historical
statements, including, without limitation, express or implied statements or guidance regarding our Phase 1b/2a clinical trial of RTB101 in combination with sirolimus in Parkinsons disease, our plans to develop RTB101 alone or in combination
with rapalogs, including the therapeutic potential and clinical benefits thereof and the potential patient populations that may be addressed by our product candidates, our ongoing and future clinical trials for RTB101 , including the timing of the
initiation and anticipated results of these trials, the continued expansion of our pipeline into Parkinsons disease, and our ability to replicate results achieved in our clinical trials in any future trials, constitute forward-looking
statements. The use of words such as, but not limited to, believe, expect, estimate, project, intend, future, potential, continue, may,
might, plan, will, should, seek, anticipate, or could and other similar words or expressions are intended to identify forward-looking
statements. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on our current beliefs, expectations and assumptions regarding the future of our business, future plans and
strategies, our clinical results and other future conditions. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. No representations or warranties (expressed or implied) are made
about the accuracy of any such forward-looking statements.
Such forward-looking statements are subject to a number of material risks and uncertainties
that are more fully discussed in the section entitled Risk Factors in the Annual Report on Form 10-K filed by resTORbio, Inc. with the Securities and Exchange Commission, as well as
discussions of potential risks, uncertainties, and other important factors in our subsequent filings with the Securities and Exchange Commission. Any forward-looking statement speaks only as of the date on which it was made. Neither we, nor our
affiliates, advisors or representatives, undertake any obligation to publicly update or revise any forward-looking statement, whether as result of new information, future events or otherwise, except as required by law.