Study of Cysteamine-pantetheine Disulfide (TTI-0102) in Mild to Moderate COVID-19

All patients with confirmed COVID-19 will be managed within an outpatient continuum of care management program that includes self-assessment tools; initial telephone triage; coordinated outreach and management approach based upon individual patient risk, severity of symptoms, and time course of disease; clinician telehealth (telephone call or video platform-based) visits (initial evaluation and follow-up visits); COVID-19 testing; a separate outpatient respiratory clinic or dedicated space within an ambulatory clinic appropriated for the care of patients with COVID-19 and other respiratory problems; strategies to reduce the risk of exposure to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by staff and other patients will be employed.

Screening Period - Remote Patients will undergo screening to determine study eligibility, for a period of not more than 7 days. It is not required that patients come to study investigator clinic for screening assessments, but SARS-CoV-2 PCR test results, medical history and vital signs used to verify study eligibility must be collected from the non-investigator facility that performed them, reviewed prior to Day 1, placed in the subjects' source documentation and transcribed to the CRF. The Ethics Committee or Institutional Review Board must approve the informed consent template and the remote consent process and documentation to be utilized for the trial.

Treatment Period (Days 1-14)

• Day 1 Clinic Visit: Eligible subjects will be enrolled into the study, i.e. randomization will take place, they will receive their first dose of study drug (TTI-0102 or placebo) in clinic, and they will be dispensed enough to continue treatment at home for up to 14 days. Baseline assessments will be performed according to Appendix 22.1 Schedule of Assessments.
• Day 8 - Remote Visit: Subjects will be contacted to assess their tolerance to study drug. Subjects unable to tolerate the 5.5 gram daily dose (QD) will be instructed to split the dose into two 2.75 gram half-doses taken in the morning and the evening (BID).
• Day 14 - Clinic Visit: Subjects will return to clinic for end-of-treatment assessments specified in Appendix 22.1 Schedule of Assessments.

Subjects will continue daily study drug treatment as outpatients, under home quarantine as per local Public Health guidelines. Subjects will also receive continued standard of care therapy per study site written policies or guidelines. Study drug treatmetn should continue for 14 days, or earlier as medically appropriate (e.g., deterioration of clinical status and alternative therapy required). If the patient requires hospitalization during the study period, study drug treatment will be discontinued.

The following safety assessments will be performed at timepoints specified in the Appendix 22.1 Schedule of Assessments. In addition to unsolicited, spontaneous adverse events which are reported or observed, patients will be interviewed for additional cysteamine-associated adverse events using a protocol-specific checklist [Appendix 22.8]. Subjects will also be asked to complete the Gastrointestinal Symptom Rating Scale (GSRS) [Appendix 22.7] and a COVID-19 symptoms questionnaire [Appendix 22.6].

If a patient is required to show up in an outpatient clinic, physical examinations, electrocardiograms (ECGs), vital signs, and clinical laboratory evaluations (chemistry, hematology, urinalysis) will be performed. A standardized toxicity grading scale will be used to grade the severity of adverse events, National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) [Appendix 22.9].

Study Termination: Day 28 or upon Early Withdrawal - Remote Visit A remote (telephone or video) Study Termination Visit will take place on Day 28 for patients who completed treatment or, for patients who withdraw early, 2 weeks (14 days) after the last study drug dose.

Follow-up Period - Remote Visits Follow-up telephone contact #1 will be performed on Day 42 or 28 days/4 weeks after last study drug dose. Follow-up telephone contact #2 will take place on Day 70, or 56 days/7 weeks after last study drug dose.