Prospective Treatment Efficacy in IPF Using Genotype for Nac Selection (PRECISIONS) Trial (PRECISIONS)
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ClinicalTrials.gov Identifier: NCT04300920 |
Recruitment Status :
Recruiting
First Posted : March 9, 2020
Last Update Posted : March 22, 2023
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The purpose of this study is to compare the effect of n-acetylcysteine (NAC) plus standard care with matched placebo plus standard of care in patients diagnosed with idiopathic pulmonary fibrosis (IPF) who have the TOLLIP rs3750920 TT genotype. The study will compare the time to a composite endpoint of relative decline in lung function [10% relative decline in forced vital capacity (FVC), first respiratory hospitalization, lung transplantation, or all-cause mortality]
The secondary objectives will be to examine the effect of NAC on the components of the primary composite endpoint, the rates of clinical events, change in physiology, change in health status, and change in respiratory symptoms.
Condition or disease | Intervention/treatment | Phase |
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Idiopathic Pulmonary Fibrosis | Drug: N-acetyl cysteine Drug: Placebo | Phase 3 |
This is a multi-center, randomized, double-blind, placebo-controlled trial of NAC or placebo in about 200 participants with IPF with a TOLLIP rs3750920 TT genotype.
Eligible participants will be randomized in a 1:1 fashion to NAC or placebo, stratified by stable concomitant IPF therapy use (i.e., pirfenidone or nintedanib administered for at least 6 weeks prior to screening) versus no pirfenidone or nintedanib use. Participants will receive 600 mg NAC orally or matched placebo to take three times daily for 24 months.
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 200 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Intervention Model Description: | Eligible participants will be randomized in a 1:1 fashion to NAC or placebo, stratified by stable concomitant IPF therapy use (i.e., pirfenidone or nintedanib administered for at least 6 weeks prior to screening) versus no pirfenidone or nintedanib use. Participants will receive 600 mg NAC orally three times daily or matched placebo for 24 months. |
Masking: | Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor) |
Masking Description: | The participant and site personnel will not know which study treatment the participant is receiving. |
Primary Purpose: | Treatment |
Official Title: | Prospective Treatment Efficacy in IPF Using Genotype for Nac Selection (PRECISIONS) Trial |
Actual Study Start Date : | December 17, 2020 |
Estimated Primary Completion Date : | December 31, 2025 |
Estimated Study Completion Date : | December 31, 2025 |

Arm | Intervention/treatment |
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Experimental: N-acetylcysteine
600 mg oral N-acetylcysteine (NAC) three times daily for 24 months.
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Drug: N-acetyl cysteine
600 mg N-acetylcysteine (NAC) oral tablets three times daily for 24 months.
Other Name: NAC |
Placebo Comparator: Placebo
Placebo tablet three times daily for 24 months.
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Drug: Placebo
Matching oral placebo tablet three times daily for 24 months. |
- Time to one of the following composite endpoint criteria: 10% relative decline in forced vital capacity (FVC), first respiratory hospitalization, lung transplant or death from any cause. [ Time Frame: 24 months ]This is a composite endpoint of time to 10% relative decline in forced vital capacity (FVC), first respiratory hospitalization, lung transplant or death from any cause. Respiratory hospitalizations will be determined by a blinded clinical events classification (adjudication) committee.
- Time to one of the following composite criteria: 10% relative decline in FVC % predicted, first respiratory hospitalization, lung transplant or death from any cause. [ Time Frame: 24 months ]This is a composite endpoint of time to 10% relative decline in FVC % predicted, based on the global lung initiative (GLI) reference equation, first respiratory hospitalization, lung transplant or death from any cause. Respiratory hospitalizations will be determined by a blinded clinical events classification (adjudication) committee.
- Time to death from any cause [ Time Frame: 24 months ]
- Time to first respiratory hospitalization [ Time Frame: 24 months ]Respiratory hospitalizations will be determined by a blinded clinical events classification (adjudication) committee.
- Time to 10% relative decline in FVC [ Time Frame: 24 months ]
- Time to lung transplant [ Time Frame: 24 months ]
- Time to 10% relative decline in FVC %predicted [ Time Frame: 24 months ]
- Time to first all-cause hospitalization [ Time Frame: 24 months ]
- Annualized rate of respiratory hospitalizations [ Time Frame: 24 months ]
- Annualized rate of non-elective, all-cause hospitalizations [ Time Frame: 24 months ]
- Proportion of participants undergoing lung transplant during follow-up [ Time Frame: 24 months ]
- Change in FVC from randomization at 12 months [ Time Frame: 12 months ]
- Change in FVC % predicted from randomization at 12 months [ Time Frame: 12 months ]
- Change in FVC from randomization at 24 months [ Time Frame: 24 months ]
- Change in FVC % predicted from randomization at 24 months [ Time Frame: 24 months ]
- Change in diffusing capacity of the lung for carbon monoxide (DLCO) uncorrected for hemoglobin from randomization at 12 months [ Time Frame: 12 months ]
- Change in DLCO from randomization at 24 months [ Time Frame: 24 months ]
- Change in patient reported outcomes scores for the Leicester Cough Questionnaire (LCQ) from randomization at 12 months. [ Time Frame: 12 months ]
- Change in patient reported outcomes scores for the EuroQoL EQ-5D Questionnaire from randomization at 12 months. [ Time Frame: 12 months ]
- Change in patient reported outcomes scores for the University of California, San Diego Shortness of Breath (UCSD-SOB) Questionnaire from randomization at 12 months. [ Time Frame: 12 months ]
- Change in patient reported outcomes scores for the King's Brief Interstitial Lung Disease (K-BILD) Questionnaire from randomization at 12 months. [ Time Frame: 12 months ]
- Change in patient reported outcomes scores for the St. George's Respiratory Questionnaire (SGRQ) from randomization at 12 months. [ Time Frame: 12 months ]
- Change in patient reported outcomes scores for the Leicester Cough Questionnaire (LCQ) from randomization at 24 months [ Time Frame: 24 months ]
- Change in patient reported outcomes scores for the EuroQoL EQ-5D Questionnaire from randomization at 24 months [ Time Frame: 24 months ]
- Change in patient reported outcomes scores for the University of California, San Diego Shortness of Breath (UCSD-SOB) Questionnaire from randomization at 24 months [ Time Frame: 24 months ]
- Change in patient reported outcomes scores for the King's Brief Interstitial Lung Disease (K-BILD) Questionnaire from randomization at 24 months [ Time Frame: 24 months ]
- Change in patient reported outcomes scores for the St. George's Respiratory Questionnaire (SGRQ) from randomization at 24 months [ Time Frame: 24 months ]
- Proportion of participants with and number of treatment-emergent adverse events, serious adverse events, adverse events leading to discontinuation, and unanticipated problems [ Time Frame: 24 months ]

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Ages Eligible for Study: | 40 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- ≥ 40 years of age
- Diagnosed with IPF according to 2018 ATS/ERS/JRS/ALAT, confirmed by enrolling investigator
- Signed informed consent
- If taking pirfenidone or nintedanib, must be on stable dose for at least 6 weeks prior to enrollment visit
- Confirmed rs3570920 TT TOLLIP genotype
Exclusion Criteria:
- Pregnancy or planning to become pregnant
- Women of childbearing potential not willing to remain abstinent (refrain from heterosexual intercourse) or use two adequate methods of contraception, including at least one method with a failure rate of <1% per year during study participation
- Significant medical, surgical or psychiatric illness that in the opinion of the investigator would affect subject safety, including liver and renal failure
- Receipt of an investigational drug or biological agent within the previous 4 weeks of the screening visit or 5 times the half-life, if longer
- Supplemental or prescribed NAC therapy within 60 days of enrollment
- Listed for lung transplantation at the time of screening
- History of lung cancer
- Inability to perform spirometry
- Forced vital capacity (FVC) less than 45% predicted, using the global lung function index (GLI) equation at Visit 1
- Active respiratory infection requiring treatment with antibiotics within 4 weeks of Visit 1

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04300920
Contact: Betsy Peters | 646-962-2742 | elp2018@med.cornell.edu |

Principal Investigator: | Fernando J Martinez, MD | Weill Medical College of Cornell University | |
Principal Investigator: | Imre Noth, MD | University of Virginia | |
Principal Investigator: | Kevin Flaherty, MS, MD | University of Michigan | |
Principal Investigator: | Cathie Spino, ScD | University of Michigan |
Responsible Party: | Weill Medical College of Cornell University |
ClinicalTrials.gov Identifier: | NCT04300920 |
Other Study ID Numbers: |
19-12021232 1U24HL145265-01A1 ( U.S. NIH Grant/Contract ) |
First Posted: | March 9, 2020 Key Record Dates |
Last Update Posted: | March 22, 2023 |
Last Verified: | March 2023 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | The de-identified analytic data will be prepared as SAS transport files or ASCII comma-delimited files with accompanying codebooks that describe the data and data structure. The redaction will employ best practices and will be consistent with NHLBI data sharing policies. |
Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) Informed Consent Form (ICF) |
Time Frame: | 3 years after the end of the study or 2 years after the main paper reporting the results of the trial, whichever comes first. |
Access Criteria: | Data will be shared through the NHLBI Biologic Specimen and Data Repository Information Coordinating Center (BioLINCC). |
URL: | https://biolincc.nhlbi.nih.gov/home/ |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
IPF Pulmonary Fibrosis n-acetylcysteine NAC |
Pulmonary Fibrosis Idiopathic Pulmonary Fibrosis Fibrosis Pathologic Processes Lung Diseases, Interstitial Lung Diseases Respiratory Tract Diseases Acetylcysteine N-monoacetylcystine Antiviral Agents |
Anti-Infective Agents Expectorants Respiratory System Agents Free Radical Scavengers Antioxidants Molecular Mechanisms of Pharmacological Action Protective Agents Physiological Effects of Drugs Antidotes |