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A Phase 1 TP-271 Oral PK Multiple Ascending Dose Study

Primary Purpose

Bacterial Infections

Status
Completed
Phase
Phase 1
Locations
United States
Study Type
Interventional
Intervention
TP-271
Sponsored by
Tetraphase Pharmaceuticals, Inc.
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional other trial for Bacterial Infections

Eligibility Criteria

18 Years - 50 Years (Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria:

  1. Be within the age range of 18 to 50 years, inclusive, at the time of Screening
  2. Voluntarily sign an Institutional Review Board (IRB)/Independent Ethics Committee (IEC) approved ICF to participate in the study after all relevant aspects of the study have been explained to and discussed with the subject and before undergoing any study-related procedures
  3. Have a body mass index (BMI) ≥18.0 and ≤33.0 kg/m2
  4. Have a negative history of and negative screening results for human immunodeficiency virus (HIV) types 1 and 2 and hepatitis B and C
  5. Have the ability to communicate with the study unit staff in a manner sufficient to carry out all protocol procedures as described
  6. Female subjects must be of non-childbearing potential, either 1-year postmenopausal or surgically sterile (i.e., bilateral oophorectomy, bilateral tubal ligation, or complete hysterectomy)
  7. Male subjects must be willing and able to use a barrier method of contraception or practice abstinence (including male subjects who had a vasectomy) from dosing to 90 days after final administration of the study drug

Exclusion Criteria:

  1. History and/or presence of any clinically significant disease or disorder, such as cardiovascular, pulmonary, renal, hepatic, neurological, gastrointestinal, endocrine, psychiatric or mental disease or disorder, or mental or legal incapacitation, which, in the opinion of the PI, may either put the subject at risk due to participation in the study, influence the results of the study, or influence the subject's ability to participate in the study
  2. Clinical laboratory values that fall outside of the eligibility range specified in Appendix D are exclusionary; for clinical laboratory values that are not included in Appendix D, values outside of the reference range are exclusionary, except for those parameters listed in Table 4).

    Table 4 Acceptable Out-of-Range Clinical Laboratory Values

    Low Chemistry Values:

    Bicarbonate (a) Chloride GGT HDL cholesterol LDH LDL cholesterol Phosphorus

    High Chemistry Values:

    Chloride HDL cholesterol LDL cholesterol Phosphorus Triglycerides

    Out-of-Range Urinalysis Values; High or low specific gravity Cloudy Mucus Crystals Ketones (b) Hyaline casts High or low pH Urobilinogen (c)

    Out of Range Hematology Values; High hematocrit Basophils Monocytes MCV MCH MCHC RBC

    a Bicarbonate >18 mEq/L. b Acceptable only when the concurrent blood glucose is normal. c Measured when monitoring the serum bilirubin concentration. Abbreviations: GGT = gamma-glutamyltransferase; HDL = high-density lipoprotein; LDH = lactate dehydrogenase; LDL = low-density lipoprotein; MCH = mean corpuscular hemoglobin; MCHC = mean corpuscular hemoglobin concentration; MCV = mean corpuscular volume; RBC = red blood cell.

  3. Known allergy to tetracycline antibiotics or any of the excipients in TP 271
  4. Clinically significant abnormality on a 12-lead ECG, which includes the following:

    • Rhythm other than sinus
    • Corrected QT interval using Fridericia's formula (QTcF) >450 msec
    • Evidence of second- or third-degree atrioventricular (AV) block
    • Pathological Q-waves (defined as a Q-wave >40 msec or depth >0.4 to 0.5 mV)
    • Evidence of ventricular pre-excitation
    • Evidence of complete left bundle branch block (BBB), right BBB, or incomplete left BBB
    • Intraventricular conduction delay with QRS duration >120 msec
    • ST segment abnormalities, unless judged by the PI to be nonpathologic
  5. History of seizures
  6. History within 3 years of a positive result on a urine screen for drugs of abuse or a positive result on a urine screen at Screening for any of the following drugs of abuse: tetrahydrocannabinols, cocaine, opioids, phencyclidines, amphetamines, benzodiazepines, barbiturates, and cotinine
  7. Use of tobacco, nicotine, or nicotine-replacement products within 3 months prior to initial administration of study drug to the EOS Visit
  8. Typical weekly alcohol consumption of 7 or more alcoholic drinks, where 1 alcoholic drink is defined as 1 glass of beer (approximately 10 to 12 oz), 1 can of beer (12 oz), 1 glass of wine (approximately 4 to 5 oz), or distilled spirits (approximately 1 oz or 30 mL of liquor)
  9. Alcohol consumption within 48 hours prior to admission
  10. Participation in a clinical study within 10 half-lives of the prior study treatment or within the previous 3 months (if the half-life of investigational agent is unknown) prior to initial administration of study drug or planned participation in another clinical study concurrent with the present study
  11. History of difficulty donating blood or poor venous access
  12. Recent blood donation (1 unit or approximately 525 mL) within 1 month prior to receiving study drug or plans to donate prior to receiving study drug or during the clinical study
  13. Use of any prescription or nonprescription medication, including vitamins or herbal medications, vaccination, or immunization within 7 days or 5 half-lives (if known), whichever is longer, prior to initial administration of study drug, with the following exceptions: medications used to treat an AE are permitted, and the use of acetaminophen, naproxen, and ibuprofen is permitted, except for within 24 hours prior to dosing
  14. Male subjects who donate or plan to donate sperm during the study or within 90 days after final administration of the study drug
  15. Unwillingness or inability to follow the procedures outlined in the clinical study protocol
  16. Previous participation in another TP-271 study

Sites / Locations

  • PPD Phase I Clinic

Arms of the Study

Arm 1

Arm 2

Arm 3

Arm 4

Arm 5

Arm Type

Active Comparator

Active Comparator

Active Comparator

Active Comparator

Active Comparator

Arm Label

Cohort A

Cohort B

Cohort C

Cohort D

Cohort E

Arm Description

50 mg TP-271 q24 (n=6), a novel, broad-spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.

100 mg TLP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.

200 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.

300 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.

400 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.

Outcomes

Primary Outcome Measures

Adverse Events
Incidence, intensity, and type of adverse events.
A Directed Physical Examination including chest/respiratory
changes in physical examination findings for chest/respiratory
A Directed Physical Examination including heart/cardiovascular
Changes in Physical Examination including heart/cardiovascular
Vital Signs including Pulse Rate
Changes in Pulse Rate
Vital Signs including respiration rate
Changes in respiration rate
Vital Signs including body temperature
Changes in body temperature
Vital Signs including blood pressure
Changes in blood pressure
ECG measurements including PR interval
Changes in PR interval > or=20
ECG measurements including QRS interval
Changes in QRS interval> or=10
ECG measurements including QTcF interval
Changes in QTcF interval 30 to 60, > or =60
Safety Laboratory results including clinical chemistry
Changes in safety laboratory results including clinical chemistry
Safety Laboratory results including electrolytes
Changes in safety laboratory results including electrolytes
Safety Laboratory results including hematology
Changes in safety laboratory results including hematology
Safety Laboratory results including blood glucose
Changes in Safety laboratory results including glucose
Safety Laboratory results including coagulation
Changes in Safety Laboratory results including coagulation

Secondary Outcome Measures

Plasma concentrations
Plasma concentrations of TP-271 and its C-4 epimer TP-9555 for PK analysis
Urine pharmacokinetics
Urine concentrations of TP-271 and it's C-4 epimer, TP-9555
PK parameters - Cmax
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Cmax (the maximum observed plasma concentration)
PK parameters- Tmax
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Tmax
PK parameters AUC (0-last)
Area under the concentration versus time curve (AUC) from time zero to the last measured time point
PK parameters - AUC (0-inf)
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for AUC (0-inf) (The area under the concentration vs time curve from time zero extrapolated to infinity)
PK parameters- AUC% extrapolated
PL parameters will be calculated from the plasma concentration versus time data (as appropriate) for AUC% extrapolated (the percentage of AUC 90-inf) accounted for by extrapolation)
PK parameters - AUC (0-24)
AUC from time zero to 24 hours (AUC 0-24)
PK parameters - Lambda-z
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Lambda-z (Slope of the regression line passing through the apparent elimination phase in a concentration vs time plot)
PK parameters - CL
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for CL (Clearance: the volume of plasma cleared per unit time)
PK parameters - Vd
PK parameters will be calculated using the apparent volume of distribution following oral dosing
PK parameters -T 1/2el
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for T1/2el (The elimination half-life)

Full Information

First Posted
February 16, 2018
Last Updated
December 16, 2021
Sponsor
Tetraphase Pharmaceuticals, Inc.
Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
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1. Study Identification

Unique Protocol Identification Number
NCT03450187
Brief Title
A Phase 1 TP-271 Oral PK Multiple Ascending Dose Study
Official Title
A Phase 1, Randomized, Placebo-Controlled, Double-Blind, Multiple Ascending-Dose Study to Assess the Safety, Tolerability, and Pharmacokinetics of Oral TP-271 in Healthy Adult Subjects
Study Type
Interventional

2. Study Status

Record Verification Date
December 2021
Overall Recruitment Status
Completed
Study Start Date
March 20, 2018 (Actual)
Primary Completion Date
December 31, 2018 (Actual)
Study Completion Date
March 31, 2019 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
Tetraphase Pharmaceuticals, Inc.
Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)

4. Oversight

Studies a U.S. FDA-regulated Drug Product
Yes
Studies a U.S. FDA-regulated Device Product
No
Data Monitoring Committee
Yes

5. Study Description

Brief Summary
This is a phase 1, single-center, randomized, placebo-controlled, double-blind, multiple ascending-dose study to assess the safety, tolerability, and PK of oral TP-271 in healthy adult subjects. Male or female subjects aged 18 to 50 years who fulfill the inclusion/exclusion criteria will be enrolled in this study.
Detailed Description
This is a phase 1, single-center, randomized, placebo-controlled, double-blind, multiple ascending-dose study to assess the safety, tolerability, and PK of oral TP-271 in healthy adult subjects. Male or female subjects aged 18 to 50 years who fulfill the inclusion/exclusion criteria will be enrolled in this study. Up to 5 cohorts of 8 subjects each (up to a total of 40 subjects) will be enrolled. Subjects in each cohort will be randomized 6:2 to receive multiple oral doses of TP 271 or placebo. Every effort will be made to dose all subjects in a cohort on the same day. Doses of study drug will be administered orally either once daily in the morning or twice daily in the morning and evening from Days 1 to 7. In all subjects, the morning dose will be administered following an overnight fast (minimum 8 hours) of food and all beverages, except for water. For subjects in Cohorts D and E only, the evening dose will be administered following a minimum 3-hour fast of food and all beverages, except for water. Fasting in all cohorts will continue for at least 2 hours following each study drug administration. During the Screening Period (within 28 days prior to the subject receiving study drug), each subject will be assessed for eligibility. Each subject must sign and date an ICF prior to undergoing any study-related procedures.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Bacterial Infections

7. Study Design

Primary Purpose
Other
Study Phase
Phase 1
Interventional Study Model
Parallel Assignment
Model Description
Up to 5 cohorts of 8 subjects each will be enrolled. Subjects in each cohort will be randomized 6:2 to receive multiple oral doses of TP 271 at 1 of 5 ascending doses of TP-271 or placebo once or twice daily for 7 days, as shown in the table below. Every effort will be made to dose all subjects in a cohort on the same day. Proposed Oral Doses of Study Drug by Dose Cohort Cohort Dose Regimen Proposed Oral Dose A Once daily 50 mg TP-271 q24 (n = 6) or matching placebo (n = 2) B Once daily 100 mg TP-271 q24 (n = 6) or matching placebo (n = 2) C Once daily 200 mg TP-271 q24 (n = 6) or matching placebo (n = 2) D Once daily 300 mg TP-271 q24 (n = 6) or matching placebo (n = 2) E Once daily 400 mg TP-271 q24 (n = 6) or matching placebo (n = 2) Abbreviations: q24 = every 24 hours.
Masking
ParticipantCare ProviderInvestigatorOutcomes Assessor
Masking Description
Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Allocation
Randomized
Enrollment
40 (Actual)

8. Arms, Groups, and Interventions

Arm Title
Cohort A
Arm Type
Active Comparator
Arm Description
50 mg TP-271 q24 (n=6), a novel, broad-spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.
Arm Title
Cohort B
Arm Type
Active Comparator
Arm Description
100 mg TLP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.
Arm Title
Cohort C
Arm Type
Active Comparator
Arm Description
200 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.
Arm Title
Cohort D
Arm Type
Active Comparator
Arm Description
300 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.
Arm Title
Cohort E
Arm Type
Active Comparator
Arm Description
400 mg TP-271 q24 (n=6), a novel, broad spectrum tetracycline-class antibiotic or matching placebo (n=2) once daily for 7 days.
Intervention Type
Drug
Intervention Name(s)
TP-271
Intervention Description
multiple oral doses of TP-271 or placebo, randomized 6:2, doses escalating 50 mg, 100 mg, 200 mg, 300 mg, 400 mg once daily for 7 days.
Primary Outcome Measure Information:
Title
Adverse Events
Description
Incidence, intensity, and type of adverse events.
Time Frame
From the time of signing of the informed consent form throughout study completion (approximately 39 days)
Title
A Directed Physical Examination including chest/respiratory
Description
changes in physical examination findings for chest/respiratory
Time Frame
Day -1 to the End of Study visit, Day 21
Title
A Directed Physical Examination including heart/cardiovascular
Description
Changes in Physical Examination including heart/cardiovascular
Time Frame
Day -1 to the End of study visit, Day 21
Title
Vital Signs including Pulse Rate
Description
Changes in Pulse Rate
Time Frame
Day -1 to the End of study visit, Day 21
Title
Vital Signs including respiration rate
Description
Changes in respiration rate
Time Frame
Day -1 to the End of study visit, Day 21
Title
Vital Signs including body temperature
Description
Changes in body temperature
Time Frame
Day -1 to the end of study visit, Day 21
Title
Vital Signs including blood pressure
Description
Changes in blood pressure
Time Frame
Day -1 to the End of study visit, Day 21
Title
ECG measurements including PR interval
Description
Changes in PR interval > or=20
Time Frame
Day -1 to the End of study visit, Day 21
Title
ECG measurements including QRS interval
Description
Changes in QRS interval> or=10
Time Frame
Day -1 to the end of study visit, Day 21
Title
ECG measurements including QTcF interval
Description
Changes in QTcF interval 30 to 60, > or =60
Time Frame
Day -1 to the end of study visit, Day 21
Title
Safety Laboratory results including clinical chemistry
Description
Changes in safety laboratory results including clinical chemistry
Time Frame
Day -1 to the End of study visit, Day 21
Title
Safety Laboratory results including electrolytes
Description
Changes in safety laboratory results including electrolytes
Time Frame
Day -1 to the End of study visit, Day 21
Title
Safety Laboratory results including hematology
Description
Changes in safety laboratory results including hematology
Time Frame
Day -1 to the End of study visit, Day 21
Title
Safety Laboratory results including blood glucose
Description
Changes in Safety laboratory results including glucose
Time Frame
Day -1 to the End of study visit, Day 21
Title
Safety Laboratory results including coagulation
Description
Changes in Safety Laboratory results including coagulation
Time Frame
Day -1 to the End of study visit, Day 21
Secondary Outcome Measure Information:
Title
Plasma concentrations
Description
Plasma concentrations of TP-271 and its C-4 epimer TP-9555 for PK analysis
Time Frame
Days 1-7
Title
Urine pharmacokinetics
Description
Urine concentrations of TP-271 and it's C-4 epimer, TP-9555
Time Frame
Days 1-7
Title
PK parameters - Cmax
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Cmax (the maximum observed plasma concentration)
Time Frame
Days 1-7
Title
PK parameters- Tmax
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Tmax
Time Frame
Days 1-7
Title
PK parameters AUC (0-last)
Description
Area under the concentration versus time curve (AUC) from time zero to the last measured time point
Time Frame
Days 1-7
Title
PK parameters - AUC (0-inf)
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for AUC (0-inf) (The area under the concentration vs time curve from time zero extrapolated to infinity)
Time Frame
Days 1-7
Title
PK parameters- AUC% extrapolated
Description
PL parameters will be calculated from the plasma concentration versus time data (as appropriate) for AUC% extrapolated (the percentage of AUC 90-inf) accounted for by extrapolation)
Time Frame
Days 1-7
Title
PK parameters - AUC (0-24)
Description
AUC from time zero to 24 hours (AUC 0-24)
Time Frame
Days 1-7
Title
PK parameters - Lambda-z
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for Lambda-z (Slope of the regression line passing through the apparent elimination phase in a concentration vs time plot)
Time Frame
Days 1-7
Title
PK parameters - CL
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for CL (Clearance: the volume of plasma cleared per unit time)
Time Frame
Days 1-7
Title
PK parameters - Vd
Description
PK parameters will be calculated using the apparent volume of distribution following oral dosing
Time Frame
Days 1-7
Title
PK parameters -T 1/2el
Description
PK parameters will be calculated from the plasma concentration versus time data (as appropriate) for T1/2el (The elimination half-life)
Time Frame
Days 1-7

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
50 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Be within the age range of 18 to 50 years, inclusive, at the time of Screening Voluntarily sign an Institutional Review Board (IRB)/Independent Ethics Committee (IEC) approved ICF to participate in the study after all relevant aspects of the study have been explained to and discussed with the subject and before undergoing any study-related procedures Have a body mass index (BMI) ≥18.0 and ≤33.0 kg/m2 Have a negative history of and negative screening results for human immunodeficiency virus (HIV) types 1 and 2 and hepatitis B and C Have the ability to communicate with the study unit staff in a manner sufficient to carry out all protocol procedures as described Female subjects must be of non-childbearing potential, either 1-year postmenopausal or surgically sterile (i.e., bilateral oophorectomy, bilateral tubal ligation, or complete hysterectomy) Male subjects must be willing and able to use a barrier method of contraception or practice abstinence (including male subjects who had a vasectomy) from dosing to 90 days after final administration of the study drug Exclusion Criteria: History and/or presence of any clinically significant disease or disorder, such as cardiovascular, pulmonary, renal, hepatic, neurological, gastrointestinal, endocrine, psychiatric or mental disease or disorder, or mental or legal incapacitation, which, in the opinion of the PI, may either put the subject at risk due to participation in the study, influence the results of the study, or influence the subject's ability to participate in the study Clinical laboratory values that fall outside of the eligibility range specified in Appendix D are exclusionary; for clinical laboratory values that are not included in Appendix D, values outside of the reference range are exclusionary, except for those parameters listed in Table 4). Table 4 Acceptable Out-of-Range Clinical Laboratory Values Low Chemistry Values: Bicarbonate (a) Chloride GGT HDL cholesterol LDH LDL cholesterol Phosphorus High Chemistry Values: Chloride HDL cholesterol LDL cholesterol Phosphorus Triglycerides Out-of-Range Urinalysis Values; High or low specific gravity Cloudy Mucus Crystals Ketones (b) Hyaline casts High or low pH Urobilinogen (c) Out of Range Hematology Values; High hematocrit Basophils Monocytes MCV MCH MCHC RBC a Bicarbonate >18 mEq/L. b Acceptable only when the concurrent blood glucose is normal. c Measured when monitoring the serum bilirubin concentration. Abbreviations: GGT = gamma-glutamyltransferase; HDL = high-density lipoprotein; LDH = lactate dehydrogenase; LDL = low-density lipoprotein; MCH = mean corpuscular hemoglobin; MCHC = mean corpuscular hemoglobin concentration; MCV = mean corpuscular volume; RBC = red blood cell. Known allergy to tetracycline antibiotics or any of the excipients in TP 271 Clinically significant abnormality on a 12-lead ECG, which includes the following: Rhythm other than sinus Corrected QT interval using Fridericia's formula (QTcF) >450 msec Evidence of second- or third-degree atrioventricular (AV) block Pathological Q-waves (defined as a Q-wave >40 msec or depth >0.4 to 0.5 mV) Evidence of ventricular pre-excitation Evidence of complete left bundle branch block (BBB), right BBB, or incomplete left BBB Intraventricular conduction delay with QRS duration >120 msec ST segment abnormalities, unless judged by the PI to be nonpathologic History of seizures History within 3 years of a positive result on a urine screen for drugs of abuse or a positive result on a urine screen at Screening for any of the following drugs of abuse: tetrahydrocannabinols, cocaine, opioids, phencyclidines, amphetamines, benzodiazepines, barbiturates, and cotinine Use of tobacco, nicotine, or nicotine-replacement products within 3 months prior to initial administration of study drug to the EOS Visit Typical weekly alcohol consumption of 7 or more alcoholic drinks, where 1 alcoholic drink is defined as 1 glass of beer (approximately 10 to 12 oz), 1 can of beer (12 oz), 1 glass of wine (approximately 4 to 5 oz), or distilled spirits (approximately 1 oz or 30 mL of liquor) Alcohol consumption within 48 hours prior to admission Participation in a clinical study within 10 half-lives of the prior study treatment or within the previous 3 months (if the half-life of investigational agent is unknown) prior to initial administration of study drug or planned participation in another clinical study concurrent with the present study History of difficulty donating blood or poor venous access Recent blood donation (1 unit or approximately 525 mL) within 1 month prior to receiving study drug or plans to donate prior to receiving study drug or during the clinical study Use of any prescription or nonprescription medication, including vitamins or herbal medications, vaccination, or immunization within 7 days or 5 half-lives (if known), whichever is longer, prior to initial administration of study drug, with the following exceptions: medications used to treat an AE are permitted, and the use of acetaminophen, naproxen, and ibuprofen is permitted, except for within 24 hours prior to dosing Male subjects who donate or plan to donate sperm during the study or within 90 days after final administration of the study drug Unwillingness or inability to follow the procedures outlined in the clinical study protocol Previous participation in another TP-271 study
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Larry Tsai, MD
Organizational Affiliation
Tetraphase Pharmaceuticals
Official's Role
Study Director
Facility Information:
Facility Name
PPD Phase I Clinic
City
Austin
State/Province
Texas
ZIP/Postal Code
78744
Country
United States

12. IPD Sharing Statement

Plan to Share IPD
Undecided

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A Phase 1 TP-271 Oral PK Multiple Ascending Dose Study

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