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TX000045- Dose A

Phase 2

Pulmonary Hypertension | Small molecule | Cardiovascular |Tectonic Therapeutic, Inc. Common Stock|Last Updated: Jan 29, 2026

Target and mechanism

Molecular targetRXFP1
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment180

FDA Designations

No designations recorded

Clinical trial landscape

TX000045- Dose A · 1 trial · 2 indications

Phase 2 1
NCT06616974A Study of TX000045 in Patients With Pulmonary Hypertension Secondary to Heart Failure With Preserved Ejection Fraction (the APEX Study)Pulmonary Hypertension
RECRUITING180 Analytics
PHASE2RECRUITING
A Study of TX000045 in Patients With Pulmonary Hypertension Secondary to Heart Failure With Preserved Ejection Fraction (the APEX Study)
Pulmonary HypertensionUnlock trial analytics

Study Design & Arms

Interventions

NameTypeDescription
TX000045- Dose ADRUGThe participants will receive a subcutaneous injection of Dose A of TX000045 every 2 weeks for 24 weeks.
TX000045- Dose BDRUGThe participants will receive subcutaneous injection of Dose B of TX000045 every 4 weeks for 24 weeks where they will alternate between TX000045 and placebo every 2 weeks.
PlaceboDRUGThe participants will receive a subcutaneous injection of placebo every 2 weeks for 24 weeks.
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Frequently asked questions about TX000045- Dose A

What is TX000045 used for?

TX000045 is an investigational small molecule being developed for pulmonary hypertension, specifically pulmonary hypertension secondary to heart failure with preserved ejection fraction. It is currently in Phase 2 clinical development and has not been approved by the FDA.

What does TX000045 target?

TX000045 targets the RXFP1 receptor. RXFP1 is the receptor for relaxin family peptides, and activation of this receptor is being studied for its potential effects in pulmonary hypertension associated with heart failure with preserved ejection fraction.

Who is developing TX000045?

TX000045 is being developed by Tectonic Therapeutic, Inc., a biopharmaceutical company whose common stock trades under the ticker symbol TECX on the NASDAQ.

What phase is TX000045 in?

TX000045 is in Phase 2 clinical development. It is currently being evaluated in a Phase 2 study and remains an investigational drug, meaning it has not yet received regulatory approval for any use.

What clinical trials is TX000045 in?

TX000045 is being studied in the APEX Study, registered as NCT06616974. This Phase 2 trial is recruiting patients with pulmonary hypertension secondary to heart failure with preserved ejection fraction and has a planned enrollment of 180 participants.

Is TX000045 the same as Dose A?

TX000045 is also referred to as TX000045- Dose A in some contexts. Both names refer to the same investigational drug candidate being developed by Tectonic Therapeutic for pulmonary hypertension.