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Phase 1/1b Study With Nab-sirolimus for Patients With Severe Pulmonary Arterial Hypertension

A Phase 1/1b Clinical Trial of ABI-009, an mTOR Inhibitor, for Patients With Severe Pulmonary Arterial Hypertension (PAH)

Status
Completed
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT02587325
Enrollment
15
Registered
2015-10-27
Start date
2017-04-01
Completion date
2022-09-16
Last updated
2024-11-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Pulmonary Hypertension

Brief summary

mTOR activation has been shown to be relevant in the development and progression of pulmonary hypertension. Inhibition of mTOR has been shown to reverse or regress pulmonary hypertension in animal models. nab-Sirolimus (also known as ABI-009, nab-rapamycin) is an albumin-bound mTOR inhibitor with improved penetration in lung tissue.

Detailed description

nab-Sirolimus, an mTOR inhibitor, is a novel formulation of albumin-bound sirolimus nanoparticles and has produced encouraging results in oncology at doses up to 100 mg/m2 given once weekly IV. This study is aimed to determine the optimal clinial dose of once weekly IV nab-sirolimus in patients with PAH and safety of 16 weeks of therapy (Phase 1, Dose finding Safety Part) followed optionally by up to 32 weeks of therapy (Extension Part).

Interventions

nab-sirolimus is an mTOR inhibitor

Sponsors

Aadi Bioscience, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
NON_RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Male or female age \>18 years old with a current diagnosis of WHO Group 1 PAH including idiopathic pulmonary arterial hypertension (IPAH), heritable pulmonary arterial hypertension (HPAH), drug and toxin induced PAH, or PAH associated with connective tissue disease, or congenital heart defects (repaired greater than 1 year prior to Screening) * Must meet following hemodynamic definition prior to initiation of study drug * Mean PAP of ≥ 25 mm Hg * PCWP or left ventricular end diastolic pressure (LVEDP) of ≤ 15 mm * PVR \> 5 mmHg/L/min (Woods unit) * Functional class II or III according to the WHO set forth at the Dana Point Classification 2008 Meeting * On 2 or more specific standard PAH therapies (for ≥ 8 consecutive weeks and at stable dose for ≥ 4 consecutive weeks) unless documented inability to tolerate 2 standard therapies * Meet the following criteria determined by pulmonary function tests completed no more than 24 weeks prior to screening, performed with or without bronchodilation: * Forced expiratory volume in one second (FEV1) ≥ 55% of predicted normal * FEV1:forced vital capacity (FVC) ratio ≥ 0.60 * 6MWD ≥150 meters and ≤450 meters * Negative serum pregnancy test * Female of childbearing age either surgically sterilized or using acceptable method of contraception * Ability to provide written informed consent by the patient or legal guardian

Exclusion criteria

* History of heart disease including left ventricular ejection fraction (LVEF) ≤ 40% or clinically significant valvular constrictive or atherosclerotic heart disease (myocardial infarction, angina, cerebrovascular accident) * History of malignancy in 2 years prior to enrollment * Pulmonary hypertension (PH) belonging to groups 2 to 5 of the 2013 Nice classification * Current or recent (\< 3 months) use of inotropic or vasopressor agents for the treatment of PAH * Recent (\< 2 months) PAH related hospital admission * History of allergic reactions attributed to compounds of similar chemical or biologic composition including macrolide (eg, azithromycin, clarithromycin, dirithromycin, and erythromycin) and ketolide antibiotics * Uncontrolled diabetes mellitus as defined by HbA1c \>8% despite adequate therapy * Uncontrolled hyperlipidemia (serum triglyceride ≥300 mg/dL) * Serum cholesterol ≥350 mg/dL * Surgery within 3 months of start date of study drug * Baseline cytopenias: * Absolute Neutrophil Count ≤ 1.5 x 109/L * Hemoglobin ≤ 9 g/dL * Platelet count \< 100,000/mm3 * Baseline liver disease: ALT/AST, total bilirubin, alkaline phosphatase \>1.5 x ULN * Baseline renal disease: creatinine \>1.5 ULN and/or creatinine clearance (Cockcroft formula) ≤ 30 mL/min * Inability to attend scheduled clinic visits * Prior use of study drug within previous 6 months from enrollment * Previous lung transplant * Naïve to available standard PAH therapy * Concomitant genetic or acquired immunosuppressive diseases (such as HIV, AIDS) * Uncontrolled intercurrent illness that in the opinion of the investigator would limit compliance and tolerance to study requirements (eg, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, diabetes, uncontrolled hypertension, coronary artery disease, or psychiatric illness/social situations) * Concomitant enrollment in another investigational treatment protocol for PAH * Use of strong inhibitors and inducers of CYP3A4 within the 14 days prior to receiving the first dose of ABI-009. Additionally, use of any known CYP3A4 substrates with narrow therapeutic window (such as fentanyl, alfentanil, astemizole, cisapride, dihydroergotamine, pimozide, quinidine, terfanide) within the 14 days prior to receiving the first dose of ABI-009

Design outcomes

Primary

MeasureTime frameDescription
Dose-limiting Toxicities16 weeksA dose-limiting toxicity (DLT) was defined as a study drug-related Grade ≥3 hematologic AE or persistent intolerable nonhematologic AE of any grade that occurred during the first 4 weeks of treatment, requiring dose reduction or permanent discontinuation of the study drug, in the opinion of the Investigator. The number and percent of patients with a DLT were to be reported by dose cohorts in the Phase 1 dose finding part of the study if any were observed in the study.

Secondary

MeasureTime frameDescription
Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)17 WeeksMedian Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in RHC based on Central Lab Analysis (Pulmonary vascular resistance, Cardiac Output, Cardiac Index, Stroke Volume)
6-minute Walk Distance (6MWD)17 WeeksMedian Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in 6MWD
N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)17 WeeksMedian Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in NT Pro-BNP

Countries

United States

Participant flow

Participants by arm

ArmCount
Nab-Sirolimus Dose Cohort 1
nab-Sirolimus Dose Cohort 1 at 10 mg/m\^2, given once weekly intravenously for 16 weeks.
4
Nab-Sirolimus Dose Cohort 2
nab-Sirolimus Dose Cohort 2 at 1.0 mg/m\^2, given once weekly intravenously for 16 weeks.
3
Nab-Sirolimus Dose Cohort 3
nab-Sirolimus Dose Cohort 3 at 2.5 mg/m\^2, given once weekly intravenously for 16 weeks.
4
Nab-Sirolimus Dose Cohort 4
nab-Sirolimus Dose Cohort 4 at 5.0 mg/m\^2, given once weekly intravenously for 16 weeks.
3
Nab-Sirolimus Dose Cohort 5
nab-Sirolimus Dose Cohort 5 at 7.5 mg/m\^2, given once weekly intravenously for 16 weeks.
1
Total15

Withdrawals & dropouts

PeriodReasonFG000FG001FG002FG003FG004
16-Week Dose-finding Safety PartAdverse Event10000
16-Week Dose-finding Safety PartCOVID-19 risk00010
32-Week Optional Extension PartAdverse Event00100
32-Week Optional Extension PartLost to Follow-up00101

Baseline characteristics

CharacteristicNab-Sirolimus Dose Cohort 1Nab-Sirolimus Dose Cohort 2Nab-Sirolimus Dose Cohort 3Nab-Sirolimus Dose Cohort 4Nab-Sirolimus Dose Cohort 5Total
Age, Continuous56.5 years45 years38.5 years45 years28 years45 years
Body Surface Area
16-Week Dose-finding Safety Part
2.1 m^21.6 m^21.6 m^21.8 m^21.8 m^21.7 m^2
Body Surface Area
32-Week Optional Extension Part
1.5 m^21.7 m^21.9 m^21.8 m^21.8 m^2
Ethnicity (NIH/OMB)
16-Week Dose-finding Safety Part
Hispanic or Latino
0 Participants1 Participants1 Participants1 Participants0 Participants3 Participants
Ethnicity (NIH/OMB)
16-Week Dose-finding Safety Part
Not Hispanic or Latino
4 Participants2 Participants3 Participants2 Participants1 Participants12 Participants
Ethnicity (NIH/OMB)
16-Week Dose-finding Safety Part
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Ethnicity (NIH/OMB)
32-Week Optional Extension Part
Hispanic or Latino
0 Participants1 Participants2 Participants0 Participants0 Participants3 Participants
Ethnicity (NIH/OMB)
32-Week Optional Extension Part
Not Hispanic or Latino
0 Participants0 Participants2 Participants1 Participants1 Participants4 Participants
Ethnicity (NIH/OMB)
32-Week Optional Extension Part
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
American Indian or Alaska Native
0 Participants0 Participants1 Participants0 Participants0 Participants1 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
Asian
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
Black or African American
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
More than one race
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
16-Week Dose-finding Part
White
4 Participants3 Participants3 Participants3 Participants1 Participants14 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
American Indian or Alaska Native
0 Participants0 Participants1 Participants0 Participants0 Participants1 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
Asian
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
Black or African American
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
More than one race
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
Unknown or Not Reported
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants
Race (NIH/OMB)
32-Week Optional Extension Part
White
0 Participants1 Participants3 Participants1 Participants1 Participants6 Participants
Region of Enrollment
United States
4 participants3 participants4 participants3 participants1 participants15 participants
Sex: Female, Male
16-Week Dose-finding Safety Part
Female
3 Participants3 Participants4 Participants3 Participants1 Participants14 Participants
Sex: Female, Male
16-Week Dose-finding Safety Part
Male
1 Participants0 Participants0 Participants0 Participants0 Participants1 Participants
Sex: Female, Male
32-Week Optional Extension Part
Female
0 Participants1 Participants4 Participants1 Participants1 Participants7 Participants
Sex: Female, Male
32-Week Optional Extension Part
Male
0 Participants0 Participants0 Participants0 Participants0 Participants0 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
EG004
affected / at risk
EG005
affected / at risk
EG006
affected / at risk
EG007
affected / at risk
EG008
affected / at risk
EG009
affected / at risk
deaths
Total, all-cause mortality
0 / 40 / 30 / 40 / 30 / 10 / 150 / 10 / 40 / 10 / 1
other
Total, other adverse events
4 / 43 / 34 / 43 / 31 / 115 / 150 / 14 / 41 / 11 / 1
serious
Total, serious adverse events
1 / 40 / 30 / 41 / 30 / 12 / 150 / 11 / 40 / 10 / 1

Outcome results

Primary

Dose-limiting Toxicities

A dose-limiting toxicity (DLT) was defined as a study drug-related Grade ≥3 hematologic AE or persistent intolerable nonhematologic AE of any grade that occurred during the first 4 weeks of treatment, requiring dose reduction or permanent discontinuation of the study drug, in the opinion of the Investigator. The number and percent of patients with a DLT were to be reported by dose cohorts in the Phase 1 dose finding part of the study if any were observed in the study.

Time frame: 16 weeks

Population: The Treated Population included all patients who received at least 1 dose of nab sirolimus. This population was used for analyses of safety.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Nab-Sirolimus Dose Cohort 1Dose-limiting Toxicities0 Participants
Nab-Sirolimus Dose Cohort 2Dose-limiting Toxicities0 Participants
Nab-Sirolimus Dose Cohort 3Dose-limiting Toxicities0 Participants
Nab-Sirolimus Dose Cohort 4Dose-limiting Toxicities0 Participants
Nab-Sirolimus Dose Cohort 5Dose-limiting Toxicities0 Participants
Secondary

6-minute Walk Distance (6MWD)

Median Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in 6MWD

Time frame: 17 Weeks

Population: The Efficacy Evaluable Population included all patients who received at least 1 dose of nab-sirolimus and had at least one post-baseline efficacy assessment. This population was used for analyses of efficacy (N=13).

ArmMeasureValue (MEDIAN)
Nab-Sirolimus Dose Cohort 16-minute Walk Distance (6MWD)-2.0 percentage of change
Nab-Sirolimus Dose Cohort 26-minute Walk Distance (6MWD)16.0 percentage of change
Nab-Sirolimus Dose Cohort 36-minute Walk Distance (6MWD)13.3 percentage of change
Nab-Sirolimus Dose Cohort 46-minute Walk Distance (6MWD)16.6 percentage of change
Nab-Sirolimus Dose Cohort 56-minute Walk Distance (6MWD)21.0 percentage of change
Overall6-minute Walk Distance (6MWD)15.0 percentage of change
Secondary

N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)

Median Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in NT Pro-BNP

Time frame: 17 Weeks

Population: The Efficacy Evaluable Population included all patients who received at least 1 dose of nab-sirolimus and had at least one post-baseline efficacy assessment. This population was used for analyses of efficacy (N=12).

ArmMeasureValue (MEDIAN)
Nab-Sirolimus Dose Cohort 1N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-49.0 percentage of change
Nab-Sirolimus Dose Cohort 2N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-34.6 percentage of change
Nab-Sirolimus Dose Cohort 3N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-7.1 percentage of change
Nab-Sirolimus Dose Cohort 4N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-10.8 percentage of change
Nab-Sirolimus Dose Cohort 5N-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-17.0 percentage of change
OverallN-terminal Pro-brain Natriuretic Peptide (NT Pro-BNP)-19.3 percentage of change
Secondary

Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)

Median Percent Change from Baseline to Week 17 (after 16 weeks of treatment) in RHC based on Central Lab Analysis (Pulmonary vascular resistance, Cardiac Output, Cardiac Index, Stroke Volume)

Time frame: 17 Weeks

Population: The Efficacy Evaluable Population included all patients who received at least 1 dose of nab-sirolimus and had at least one post-baseline efficacy assessment. This population was used for analyses of efficacy (N=13).

ArmMeasureGroupValue (MEDIAN)
Nab-Sirolimus Dose Cohort 1Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)40.1 percentage of change
Nab-Sirolimus Dose Cohort 1Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)11.6 percentage of change
Nab-Sirolimus Dose Cohort 1Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)40.1 percentage of change
Nab-Sirolimus Dose Cohort 1Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)-30.1 percentage of change
Nab-Sirolimus Dose Cohort 2Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)-15.4 percentage of change
Nab-Sirolimus Dose Cohort 2Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)-14.4 percentage of change
Nab-Sirolimus Dose Cohort 2Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)10.9 percentage of change
Nab-Sirolimus Dose Cohort 2Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)-16.5 percentage of change
Nab-Sirolimus Dose Cohort 3Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)11.0 percentage of change
Nab-Sirolimus Dose Cohort 3Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)10.8 percentage of change
Nab-Sirolimus Dose Cohort 3Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)13.5 percentage of change
Nab-Sirolimus Dose Cohort 3Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)-3.5 percentage of change
Nab-Sirolimus Dose Cohort 4Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)9.4 percentage of change
Nab-Sirolimus Dose Cohort 4Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)6.3 percentage of change
Nab-Sirolimus Dose Cohort 4Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)9.6 percentage of change
Nab-Sirolimus Dose Cohort 4Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)-15.7 percentage of change
Nab-Sirolimus Dose Cohort 5Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)27.4 percentage of change
Nab-Sirolimus Dose Cohort 5Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)10.5 percentage of change
Nab-Sirolimus Dose Cohort 5Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)31.2 percentage of change
Nab-Sirolimus Dose Cohort 5Right Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)-30.8 percentage of change
OverallRight Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Stroke Volume (mL)10.5 percentage of change
OverallRight Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Pulmonary Vascular Resistance (dyn×sec/cm5)-20.5 percentage of change
OverallRight Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Thermodilution Cardiac Output Mean (L/minute)16.9 percentage of change
OverallRight Heart Catheterization Based on Central Lab Analysis (Pulmonary Vascular Resistance, Cardiac Output, Cardiac Index, Stroke Volume)Cardiac Index (L/minute/m2)21.4 percentage of change

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026