<?xml version="1.0" encoding="UTF-8"?><protocol_summary><protocol><id>14087</id><no>RT234-PAH-CL202</no><status>Open (affiliates only)</status><title>A Phase 2b, Open-label, Single Dose Study to Evaluated the Safety and Efficacy of RT234 on Exercise Parameters Assessed by Cardiopulmonary Exercise Testing (CPET) in Subjects With Pulmonary Arterial Hypertension (PAH)</title><nct_id>NCT04266197</nct_id><sponsor_type>Industrial</sponsor_type><age_group>Adult</age_group><treatment_type>Treatment</treatment_type><phase>II</phase><disease_site>Other</disease_site><PI>Krishnan, Mrinalini</PI><institution>Medstar Washington Hospital Center : Megan Fuller</institution><management_group>MCRN - Heart Failure</management_group><item><contact_id>13465</contact_id><item_description>Megan Fuller</item_description><js_safe_str>Megan Fuller</js_safe_str><email>megan.a.fuller@medstar.net</email></item></protocol><sipVersion>2026.1.0 Build 16</sipVersion><copyright> &lt;a href="https://advarra.com" target="_blank"&gt;&amp;copy; 2026 Advarra, Inc.&lt;/a&gt; </copyright></protocol_summary>