Tectonic Therapeutic Presents Complete Results for Positive Phase 1b Clinical Trial of TX45 in Patients with Group 2 Pulmonary Hypertension in HFpEF in Late-Breaking Presentation at ESC Heart Failure 2025

• Data confirmed TX45’s tolerability profile and improvements in left ventricular function and pulmonary hemodynamics in patients with Group 2 Pulmonary Hypertension in Heart Failure with preserved Ejection Fraction (“PH-HFpEF”)
• In new echocardiographic analysis, TX45 treatment resulted in sustained hemodynamic effects for 29 days
• TX45 improved cardiac and pulmonary hemodynamics in PH-HFpEF patients across a range of left ventricular ejection fractions (“LVEF”), including LVEF≥50% and LVEF 41-49%
  

WATERTOWN, Mass., May 17, 2025 (GLOBE NEWSWIRE) -- Tectonic Therapeutic, Inc. (NASDAQ: TECX) (“Tectonic”) today announced the complete results from Part A of the Phase 1b clinical trial of TX45 in patients with Group 2 Pulmonary Hypertension in Heart Failure with preserved Ejection Fraction (“PH-HFpEF”), which are being presented in a late-breaking, oral session at the European Society of Cardiology (ESC) Heart Failure 2025 Congress being held in Belgrade, Serbia. The results include the full cohort of 19 patients in Part A of the Phase 1b trial of TX45, Tectonic’s lead asset and a long-acting relaxin therapy. Interim data for 16 patients in the Phase 1b trial was previously reported in a press release on January 30, 2025.

The complete data from Part A of the Phase 1b clinical trial confirmed the tolerability and hemodynamic effects of TX45 in patients with PH-HFpEF previously reported in the interim data. Based on the complete dataset in PH-HFpEF, a single intravenous dose of TX45 was well tolerated, with no serious or severe adverse events. In the overall study population, TX45 achieved a 19.0% reduction in pulmonary capillary wedge pressure (“PCWP”), an endpoint known to correlate with exercise capacity, morbidity and mortality in patients with heart failure. In the subpopulation with combined pre- and post-capillary pulmonary hypertension (“CpcPH”) who have an elevated Pulmonary Vascular Resistance (“PVR”) and more severe disease, TX45 demonstrated >30% reduction in PVR, which along with PCWP is correlated to exercise capacity and mortality in this patient population. The Phase 1b trial enrolled a patient population and evaluated hemodynamic endpoints which are similar to the ongoing APEX Phase 2 clinical trial (ClinicalTrials.gov NCT06616974). APEX is a 24-week clinical trial in PH-HFpEF with topline results expected in 2026.