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LTI-03

Phase 2

Idiopathic Pulmonary Fibrosis | Small molecule | Respiratory |Rein Therapeutics, Inc.|Trials Updated: Oct 16, 2026

LTI-03 development status

Highest phase Phase 2
Registered trials 2 across 1 sponsor since Jul 2023

LTI-03 target and mechanism

ModalitySmall molecule

Also known as Micronized dry powder in hard 2 piece hypromellose capsules

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment144

FDA Designations

ORPHAN_DRUGFAST_TRACK

LTI-03 clinical trials

LTI-03 · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT06968845A Phase 2 Study of LTI-03 in Patients With Idiopathic Pulmonary FibrosisIdiopathic Pulmonary Fibrosis (IPF)
RECRUITING120 Analytics
PHASE2RECRUITING
A Phase 2 Study of LTI-03 in Patients With Idiopathic Pulmonary Fibrosis
Idiopathic Pulmonary Fibrosis (IPF)Unlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability as measured by the incidence of treatment-emergent adverse events (TEAEs)
Day 1 through Week 24
Incidence of Treatment-emergent Adverse Events (TEAEs)
21 days (dosing x 14 days; follow up x 7 days)

Incidence of TEAEs by dose

Secondary Endpoints

Change from baseline in forced vital capacity (FVC)
Day 1 through Week 24
Change from baseline in percent predicted FVC
Day 1 through Week 24
Change from baseline in lung fibrosis measured by high resolution computed tomography (HRCT)
Day 1 through Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
(1) 2.5 mg LTI-03 capsule BIDEXPERIMENTALCaveolin-1-Scaffolding-Protein-Derived Peptide
(2) 2.5 mg LTI-03 capsules BIDEXPERIMENTALCaveolin-1-Scaffolding-Protein-Derived Peptide
(1) Placebo capsule BIDPLACEBO_COMPARATORLactose powder
(2) Placebo capsules BIDPLACEBO_COMPARATORLactose powder
2.5 mg LTI-03 BIDEXPERIMENTAL2.5 mg LTI-03 BID x 14 days
5 mg LTI-03 BIDEXPERIMENTAL5 mg LTI-03 BID x 14 days
PlaceboPLACEBO_COMPARATORMatching placebo BID x 14 days

Interventions

NameTypeDescription
LTI-03DRUGCaveolin-1-Scaffolding-Protein-Derived Peptide
Dry Powder InhalerDEVICEPlastiape Monodose RS01 Model 7
PlaceboDRUGLactose powder
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Eligibility Criteria

Age Range40 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites48

Inclusion Criteria: 1. Male or female age 40 years or older. 2. Willing and able to provide written informed consent. 3. Diagnosis of IPF within 5 years of Screening as confirmed by a centrally read HRCT of the chest as defined by the ATS/ERS/JRS/ALAT guideline. HRCT lung fibrosis by central read d...

Countries:United StatesAustraliaBulgariaGermanyPolandRomaniaUnited Kingdom
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Recent Changes (Last 90 Days)

LOWOct 16, 2026NCT06968845lastUpdatePostDate: changed
LOWOct 16, 2026NCT06968845lastUpdatePostDate: changed
LOWSep 4, 2026NCT06968845lastUpdatePostDate: changed
LOWSep 4, 2026NCT06968845lastUpdatePostDate: changed
LOWAug 14, 2026NCT06968845lastUpdatePostDate: changed
LOWAug 14, 2026NCT06968845lastUpdatePostDate: changed
LOWAug 14, 2026NCT06968845lastUpdatePostDate: changed

Frequently asked questions about LTI-03

What is LTI-03 used for?

LTI-03 is an investigational small molecule being developed for idiopathic pulmonary fibrosis (IPF), a chronic lung disease. It is in Phase 2 clinical development and has received Orphan Drug and Fast Track designations from the FDA for this indication. LTI-03 has not been approved for any use.

Who is developing LTI-03?

LTI-03 is being developed by Rein Therapeutics, Inc., which trades under the ticker RNTX. The company is sponsoring the clinical program evaluating LTI-03 in idiopathic pulmonary fibrosis, including a Phase 2 study currently recruiting and a completed Phase 1 study.

What phase is LTI-03 in?

LTI-03 is in Phase 2 development for idiopathic pulmonary fibrosis. The Phase 2 study, NCT06968845, is currently recruiting participants. An earlier Phase 1 study in newly diagnosed IPF patients has been completed. LTI-03 remains investigational and is not FDA approved.

What clinical trials is LTI-03 in?

LTI-03 has been studied in two clinical trials. The completed Phase 1 study, NCT05954988, enrolled 24 patients with newly diagnosed IPF in the United States, Germany, and the United Kingdom. The ongoing Phase 2 study, NCT06968845, is recruiting 120 patients across the United States, Australia, Bulgaria, Germany, Poland, Romania, and the United Kingdom.

How is the Phase 2 trial of LTI-03 designed?

The Phase 2 study of LTI-03, NCT06968845, is a randomized, double-blind, placebo-controlled trial enrolling approximately 120 patients with idiopathic pulmonary fibrosis. Participants must be at least 40 years of age, and the study is recruiting across sites in the United States, Australia, Bulgaria, Germany, Poland, Romania, and the United Kingdom.

What FDA designations has LTI-03 received?

LTI-03 has received Orphan Drug and Fast Track designations from the FDA for idiopathic pulmonary fibrosis. These designations are intended to support and expedite development of therapies for serious conditions. LTI-03 is a small molecule in Phase 2 development and has not been approved by the FDA.