Phase Ib Dose-Ranging Study of the Safety, PK, PD & Efficacy of the Activin Signaling Inhibitor HS235 vs placebo added to background therapy in PAH (SEASIDE)

2025-523010-89-00 Protocol HS235-002 Human pharmacology (Phase I) - Other Authorised, recruitment pending

Status Authorised, recruitment pending · 5 EU/EEA countries · 17 sites · Protocol HS235-002

Overview

Sponsor-declared trial summary

Phase Human pharmacology (Phase I) - Other
Status Authorised, recruitment pending
Participants planned 34
Countries 5
Sites 17

Pulmonary arterial hypertension

Key facts

Sponsor
35Pharma Inc.
Participant type
Patients
Age range
18-64 years, 65+ years
Gender
Male and Female
Therapeutic area
Diseases [C] - Cardiovascular Diseases [C14]
Decision date (initial)
2026-04-07
Transition trial
No
Low-intervention
No
Rare-disease indication
No
Vulnerable population
Yes

Trial design

CTIS Part I — objectives, methods, condition coding

Conditions and MedDRA coding

Pulmonary arterial hypertension

VersionLevelCodeTermSystem organ class
21.1 PT 10064911 Pulmonary arterial hypertension 100000004855

Sponsors and contacts

Sponsor organisations, regulatory contacts, third parties

35Pharma Inc.

Sponsor organisation
35Pharma Inc.
Address
750 Saint-Laurent Boulevard Suite 101
City
Montreal
Postcode
H2Y 2Z4
Country
Canada

Scientific contact point

Organisation
35Pharma Inc.
Contact name
George Georges

Public contact point

Organisation
35Pharma Inc.
Contact name
Monique Champagne

Locations

5 EU/EEA countries · 17 investigational sites

By country

CountryMS statusPlanned subjectsSites
Czechia Authorised, recruitment pending 3 2
Germany Authorised, recruitment pending 3 2
Hungary Authorised, recruitment pending 2 2
Poland Authorised, recruitment pending 2 2
Spain Authorised, recruitment pending 7 9
Rest of world
Canada, United Kingdom, United States
17

Investigational sites

Czechia

2 sites · Authorised, recruitment pending
Institute For Clinical And Experimental Medicine
Cardiology, Videnska 1958/9, Krc, Prague
Vseobecna Fakultni Nemocnice V Praze
Cardiology, U Nemocnice 499/2, Nove Mesto, Prague

Germany

2 sites · Authorised, recruitment pending
Thoraxklinik Heidelberg gGmbH
Centre for pulmonary hypertension, Roentgenstrasse 1, Rohrbach, Heidelberg
Universitaetsmedizin Greifswald KöR
Department of Internal Medicine, Respiratory Medicine and Infectious Diseases, -, 17475, Greifswald

Hungary

2 sites · Authorised, recruitment pending
Semmelweis University
Internal Medicine and Oncology, Koranyi Sandor Utca 2/a, Kerulet, Budapest VIII
University Of Szeged
Clinical Pharmacology, Semmelweis Utca 8, 6725, Szeged

Poland

2 sites · Authorised, recruitment pending
Szpital Uniwersytecki Nr 2 Im Dr Jana Biziela W Bydgoszczy
Klinika Kardiologii, Farmakologii Klinicznej i Chorób Wewnętrznych, Ul. Kornela Ujejskiego 75, 85-168, Bydgoszcz
Krakowski Szpital Specjalistyczny Im. Sw. Jana Pawla II
Department of Cardiac and Vascular Diseases, Ul. Pradnicka 80, 31-202, Cracow

Spain

9 sites · Authorised, recruitment pending
Hospital Clinic De Barcelona
Pulmonology, Calle Villarroel 170, 08036, Barcelona
Hospital Universitario Virgen De La Macarena
Cardiology, Avenida Del Doctor Fedriani 3, 41009, Sevilla
Hospital Universitario De Toledo
Cardiology, Avenue Del Rio Guadiana Sn, 45007, Toledo
Hospital Universitario Marques De Valdecilla
Pneumology, Avenida Valdecilla Sn, 39008, Santander
Hospital Universitari Vall D Hebron
Pneumology, Passeig De La Vall D'Hebron 119-129, 08035, Barcelona
Hospital Costa Del Sol
Cardiology, Terreno Autovia Mediterraneo A-7 S/n, 29603, Marbella
Hospital Universitario La Paz
Pulmonology, Paseo De La Castellana 261, 28046, Madrid
Hospital Universitario 12 De Octubre
Cardiology, Avenida De Cordoba Sn, 28041, Madrid
Hospital Universitario De Salamanca
Pulmonology, Paseo De San Vicente 58-182, 37007, Salamanca

Application history

6 submissions — initial application plus substantial / non-substantial modifications

#TypeCodeSubmittedReference MSConclusionDecision date
1 INITIAL IN 2025-09-05 Spain Acceptable
2025-12-19
2025-12-23
2 SUBSEQUENT ADDITION OF MSC APP-2 2026-01-09 Acceptable
2025-12-19
2026-03-20
3 SUBSTANTIAL MODIFICATION SM-1 2026-01-12 Acceptable 2026-03-02
4 SUBSEQUENT ADDITION OF MSC APP-4 2026-01-13 Acceptable
2025-12-19
2026-04-07
5 SUBSTANTIAL MODIFICATION SM-2 2026-01-13 Acceptable 2026-02-13
6 SUBSTANTIAL MODIFICATION SM-3 2026-01-14 Spain Acceptable 2026-02-06